diff --git a/Makefile b/Makefile
index a459e6c..f42a566 100644
--- a/Makefile
+++ b/Makefile
@@ -1,6 +1,6 @@
 CC = gcc
 CFLAGS = -Wall -Wextra -O2 -Isrc
-LDFLAGS = -lm
+LDFLAGS = -lm -lpthread
 
 SRC_DIR = src
 TEST_DIR = tests
diff --git a/TODO2.md b/TODO2.md
new file mode 100644
index 0000000..aaebaec
--- /dev/null
+++ b/TODO2.md
@@ -0,0 +1,20 @@
+# TO BUILD
+
+1. Read the whole source code in src.
+2. Add File I/O Functions to the scripting language
+2.1 Add working tests within the tests directory.
+3. Implement async I/O functions for File I/O / Socket I/O / Async I/O. The basic asyncio for methods should be we working using threads so it's a multicore application. It must be a safe way of threading but still performance.
+3.1 Add working tests within the tests directory.
+3.2 Add a nice example script source file (.rc) to the examples directory that shows file I/O, async I/O, and socket I/O.
+4. Add double data type to the language
+4.1 Add working tests within the tests directory.
+5. Implement break and continue statements in the language 
+5.1 Add working tests within the tests directory.
+6. Update Makefile, README.md, and TUTORIAL.md.
+
+# IMPORTANT
+1. Consistency (By researching how other things are implemented)
+2. Performance (But readability is also important)
+3. Ease of use for the user of the new language (No weird caveats)
+4. Safety (for using the langauge by defensive coding)
+
diff --git a/src/interpreter.c b/src/interpreter.c
index e038a55..a1a11c9 100644
--- a/src/interpreter.c
+++ b/src/interpreter.c
@@ -73,11 +73,20 @@ void statement() {
         pc++;
         while (pc < MAX_TOK && pc < tk_idx && tokens[pc].type != '}' && tokens[pc].type != 0) {
             statement();
-            if (ax == -999) break;
+            if (ax == -999 || ax == -998 || ax == -997) {
+                int brace = 1;
+                while (brace > 0 && pc < MAX_TOK && pc < tk_idx && tokens[pc].type != 0) {
+                    if (tokens[pc].type == '{') brace++;
+                    if (tokens[pc].type == '}') brace--;
+                    pc++;
+                }
+                return;
+            }
         }
         match('}');
     }
-    else if (tokens[pc].type == Int || tokens[pc].type == Char) {
+    else if (tokens[pc].type == Int || tokens[pc].type == Char || tokens[pc].type == Double) {
+        int var_type = tokens[pc].type;
         pc++;
         while (pc < MAX_TOK && pc < tk_idx && tokens[pc].type != ';') {
             while (pc < MAX_TOK && pc < tk_idx && tokens[pc].type == '*') pc++;
@@ -94,6 +103,7 @@ void statement() {
             int addr = sp;
             Symbol *s = &locals[loc_cnt++];
             strncpy(s->name, t->text, t->val); s->name[t->val] = 0;
+            s->type = var_type;
             s->addr = addr;
             s->is_array = 0;
 
@@ -129,42 +139,45 @@ void statement() {
         match(')');
         if (cond) {
             statement();
-            if (ax == -999) return;
+            if (ax == -999 || ax == -998 || ax == -997) return;
             if (pc < MAX_TOK && pc < tk_idx && tokens[pc].type == Else) { pc++; skip_block(); }
         } else {
             skip_block();
             if (pc < MAX_TOK && pc < tk_idx && tokens[pc].type == Else) {
                 pc++;
                 statement();
-                if (ax == -999) return;
+                if (ax == -999 || ax == -998 || ax == -997) return;
             }
         }
     }
     else if (tokens[pc].type == While) {
         pc++;
         int loop_start = pc;
-        match('(');
-        long cond = expression();
-        match(')');
-        if (!cond) {
-            skip_block();
-        } else {
-            int iteration_count = 0;
-            while (1) {
-                if (++iteration_count > 1000000) {
-                    error("Potential infinite loop detected");
-                }
-                statement();
-                if (ax == -999) return;
-                int save_pc = pc;
-                if (loop_start >= MAX_TOK || loop_start >= tk_idx) {
-                    error("Loop start out of bounds");
-                }
-                pc = loop_start;
-                match('(');
-                cond = expression();
-                match(')');
-                if (!cond) { pc = save_pc; break; }
+        int body_start;
+        int iteration_count = 0;
+        while (1) {
+            if (++iteration_count > 1000000) {
+                error("Potential infinite loop detected");
+            }
+            pc = loop_start;
+            match('(');
+            long cond = expression();
+            match(')');
+            if (!cond) {
+                skip_block();
+                break;
+            }
+            body_start = pc;
+            statement();
+            if (ax == -999) return;
+            if (ax == -998) {
+                ax = 0;
+                pc = body_start;
+                skip_block();
+                break;
+            }
+            if (ax == -997) {
+                ax = 0;
             }
         }
     }
@@ -175,6 +188,16 @@ void statement() {
         match(';');
         ax = -999;
     }
+    else if (tokens[pc].type == Break) {
+        pc++;
+        match(';');
+        ax = -998;
+    }
+    else if (tokens[pc].type == Continue) {
+        pc++;
+        match(';');
+        ax = -997;
+    }
     else if (tokens[pc].type == Printf) {
         pc++;
         match('(');
@@ -187,11 +210,16 @@ void statement() {
 
         char *p = fmt;
         while (*p) {
-            if (*p == '%' && (p[1] == 'd' || p[1] == 's')) {
+            if (*p == '%' && (p[1] == 'd' || p[1] == 's' || p[1] == 'f')) {
                 p++;
                 match(',');
                 long val = expression();
                 if (*p == 'd') printf("%ld", val);
+                else if (*p == 'f') {
+                    union { double d; long l; } u;
+                    u.l = val;
+                    printf("%f", u.d);
+                }
                 else if (*p == 's') {
                     char *str = (char*)val;
                     if (str) printf("%s", str);
@@ -214,7 +242,7 @@ void scan_functions() {
     int i = 0;
     while (i < MAX_TOK && i < tk_idx && tokens[i].type != 0) {
         if (i + 2 < MAX_TOK && i + 2 < tk_idx &&
-            (tokens[i].type == Int || tokens[i].type == Char) &&
+            (tokens[i].type == Int || tokens[i].type == Char || tokens[i].type == Double) &&
             tokens[i+1].type == Id && tokens[i+2].type == '(') {
 
             if (func_cnt >= 100) {
@@ -227,7 +255,7 @@ void scan_functions() {
             i += 3;
             int params = 0;
             while(i < MAX_TOK && i < tk_idx && tokens[i].type != ')') {
-                if (tokens[i].type == Int || tokens[i].type == Char) {
+                if (tokens[i].type == Int || tokens[i].type == Char || tokens[i].type == Double) {
                     params++;
                     i++;
                     while (i < MAX_TOK && i < tk_idx && tokens[i].type == '*') i++;
diff --git a/src/native_functions.c b/src/native_functions.c
index 910e825..cacc22b 100644
--- a/src/native_functions.c
+++ b/src/native_functions.c
@@ -448,6 +448,274 @@ long native_endswith(long *args, int argc) {
     return strcmp(str + str_len - suffix_len, suffix) == 0;
 }
 
+long native_fopen(long *args, int argc) {
+    if (!args || argc < 2) {
+        return 0;
+    }
+    char *filename = (char*)args[0];
+    char *mode = (char*)args[1];
+    if (!filename || !mode) {
+        return 0;
+    }
+    FILE *f = fopen(filename, mode);
+    return (long)f;
+}
+
+long native_fclose(long *args, int argc) {
+    if (!args || argc < 1) {
+        return -1;
+    }
+    FILE *f = (FILE*)args[0];
+    if (!f) {
+        return -1;
+    }
+    return fclose(f);
+}
+
+long native_fread(long *args, int argc) {
+    if (!args || argc < 3) {
+        return -1;
+    }
+    FILE *f = (FILE*)args[0];
+    int addr = (int)args[1];
+    int size = (int)args[2];
+
+    if (!f || addr < 0 || addr >= MEM_SIZE || size <= 0) {
+        return -1;
+    }
+
+    if (addr + size > MEM_SIZE) {
+        size = MEM_SIZE - addr;
+    }
+
+    char temp_buf[8192];
+    if (size > 8192) size = 8192;
+
+    int result = fread(temp_buf, 1, size, f);
+    if (result > 0) {
+        for (int i = 0; i < result && addr + i < MEM_SIZE; i++) {
+            memory[addr + i] = temp_buf[i];
+        }
+    }
+    return result;
+}
+
+long native_fwrite(long *args, int argc) {
+    if (!args || argc < 3) {
+        return -1;
+    }
+    FILE *f = (FILE*)args[0];
+    long buf_arg = args[1];
+    int size = (int)args[2];
+
+    if (!f || size <= 0) {
+        return -1;
+    }
+
+    if (buf_arg > MEM_SIZE * 8 || buf_arg < 0) {
+        return fwrite((char*)buf_arg, 1, size, f);
+    }
+
+    if (buf_arg >= MEM_SIZE) {
+        return -1;
+    }
+
+    char temp_buf[8192];
+    if (size > 8192) size = 8192;
+
+    if (buf_arg + size > MEM_SIZE) {
+        size = MEM_SIZE - buf_arg;
+    }
+
+    for (int i = 0; i < size && buf_arg + i < MEM_SIZE; i++) {
+        temp_buf[i] = (char)memory[buf_arg + i];
+    }
+
+    return fwrite(temp_buf, 1, size, f);
+}
+
+long native_fgets(long *args, int argc) {
+    static char empty_str[] = "";
+    if (!args || argc < 2) {
+        return (long)empty_str;
+    }
+    FILE *f = (FILE*)args[0];
+    int max_size = (int)args[1];
+
+    if (!f || max_size <= 0) {
+        return (long)empty_str;
+    }
+
+    if (str_pool_idx >= STR_POOL_SIZE) {
+        error("String pool overflow");
+        return (long)empty_str;
+    }
+
+    char *result = &str_pool[str_pool_idx];
+    if (max_size > STR_POOL_SIZE - str_pool_idx) {
+        max_size = STR_POOL_SIZE - str_pool_idx;
+    }
+
+    if (fgets(result, max_size, f) == NULL) {
+        return (long)empty_str;
+    }
+
+    int len = strlen(result);
+    str_pool_idx += len + 1;
+    return (long)result;
+}
+
+long native_fputs(long *args, int argc) {
+    if (!args || argc < 2) {
+        return -1;
+    }
+    FILE *f = (FILE*)args[0];
+    char *str = (char*)args[1];
+
+    if (!f || !str) {
+        return -1;
+    }
+
+    return fputs(str, f);
+}
+
+long native_feof(long *args, int argc) {
+    if (!args || argc < 1) {
+        return 1;
+    }
+    FILE *f = (FILE*)args[0];
+    if (!f) {
+        return 1;
+    }
+    return feof(f);
+}
+
+long native_ftell(long *args, int argc) {
+    if (!args || argc < 1) {
+        return -1;
+    }
+    FILE *f = (FILE*)args[0];
+    if (!f) {
+        return -1;
+    }
+    return ftell(f);
+}
+
+long native_fseek(long *args, int argc) {
+    if (!args || argc < 3) {
+        return -1;
+    }
+    FILE *f = (FILE*)args[0];
+    long offset = args[1];
+    int whence = (int)args[2];
+
+    if (!f) {
+        return -1;
+    }
+    return fseek(f, offset, whence);
+}
+
+long native_fremove(long *args, int argc) {
+    if (!args || argc < 1) {
+        return -1;
+    }
+    char *filename = (char*)args[0];
+    if (!filename) {
+        return -1;
+    }
+    return remove(filename);
+}
+
+long native_frename(long *args, int argc) {
+    if (!args || argc < 2) {
+        return -1;
+    }
+    char *oldname = (char*)args[0];
+    char *newname = (char*)args[1];
+    if (!oldname || !newname) {
+        return -1;
+    }
+    return rename(oldname, newname);
+}
+
+long native_SEEK_SET(long *args, int argc) {
+    return SEEK_SET;
+}
+
+long native_SEEK_CUR(long *args, int argc) {
+    return SEEK_CUR;
+}
+
+long native_SEEK_END(long *args, int argc) {
+    return SEEK_END;
+}
+
+long native_int_to_double(long *args, int argc) {
+    if (!args || argc < 1) {
+        return 0;
+    }
+    union { double d; long l; } u;
+    u.d = (double)args[0];
+    return u.l;
+}
+
+long native_double_to_int(long *args, int argc) {
+    if (!args || argc < 1) {
+        return 0;
+    }
+    union { double d; long l; } u;
+    u.l = args[0];
+    return (long)u.d;
+}
+
+long native_double_add(long *args, int argc) {
+    if (!args || argc < 2) {
+        return 0;
+    }
+    union { double d; long l; } u1, u2, result;
+    u1.l = args[0];
+    u2.l = args[1];
+    result.d = u1.d + u2.d;
+    return result.l;
+}
+
+long native_double_sub(long *args, int argc) {
+    if (!args || argc < 2) {
+        return 0;
+    }
+    union { double d; long l; } u1, u2, result;
+    u1.l = args[0];
+    u2.l = args[1];
+    result.d = u1.d - u2.d;
+    return result.l;
+}
+
+long native_double_mul(long *args, int argc) {
+    if (!args || argc < 2) {
+        return 0;
+    }
+    union { double d; long l; } u1, u2, result;
+    u1.l = args[0];
+    u2.l = args[1];
+    result.d = u1.d * u2.d;
+    return result.l;
+}
+
+long native_double_div(long *args, int argc) {
+    if (!args || argc < 2) {
+        return 0;
+    }
+    union { double d; long l; } u1, u2, result;
+    u1.l = args[0];
+    u2.l = args[1];
+    if (u2.d != 0.0) {
+        result.d = u1.d / u2.d;
+    } else {
+        result.d = 0.0;
+    }
+    return result.l;
+}
+
 void register_native_functions() {
     register_native_func("socket", native_socket);
     register_native_func("bind", native_bind);
@@ -475,4 +743,24 @@ void register_native_functions() {
     register_native_func("replace", native_replace);
     register_native_func("startswith", native_startswith);
     register_native_func("endswith", native_endswith);
+    register_native_func("fopen", native_fopen);
+    register_native_func("fclose", native_fclose);
+    register_native_func("fread", native_fread);
+    register_native_func("fwrite", native_fwrite);
+    register_native_func("fgets", native_fgets);
+    register_native_func("fputs", native_fputs);
+    register_native_func("feof", native_feof);
+    register_native_func("ftell", native_ftell);
+    register_native_func("fseek", native_fseek);
+    register_native_func("fremove", native_fremove);
+    register_native_func("frename", native_frename);
+    register_native_func("SEEK_SET", native_SEEK_SET);
+    register_native_func("SEEK_CUR", native_SEEK_CUR);
+    register_native_func("SEEK_END", native_SEEK_END);
+    register_native_func("int_to_double", native_int_to_double);
+    register_native_func("double_to_int", native_double_to_int);
+    register_native_func("double_add", native_double_add);
+    register_native_func("double_sub", native_double_sub);
+    register_native_func("double_mul", native_double_mul);
+    register_native_func("double_div", native_double_div);
 }
diff --git a/src/parser.c b/src/parser.c
index 3121107..0d104b2 100644
--- a/src/parser.c
+++ b/src/parser.c
@@ -35,6 +35,12 @@ long factor() {
         pc++;
         return t->val;
     }
+    else if (t->type == Dbl) {
+        pc++;
+        union { double d; long l; } u;
+        u.d = t->dval;
+        return u.l;
+    }
     else if (t->type == Str) {
         pc++;
         return (long)t->text;
@@ -256,6 +262,26 @@ long relational() {
     return val;
 }
 
+long logical_and() {
+    long val = relational();
+    while (pc < MAX_TOK && tokens[pc].type == And) {
+        pc++;
+        long val2 = relational();
+        val = val && val2;
+    }
+    return val;
+}
+
+long logical_or() {
+    long val = logical_and();
+    while (pc < MAX_TOK && tokens[pc].type == Or) {
+        pc++;
+        long val2 = logical_and();
+        val = val || val2;
+    }
+    return val;
+}
+
 long expression() {
     if (pc >= MAX_TOK) return 0;
     if (tokens[pc].type == '*') {
@@ -327,5 +353,5 @@ long expression() {
         }
     }
 
-    return relational();
+    return logical_or();
 }
diff --git a/src/parser.h b/src/parser.h
index 077e672..e5874f9 100644
--- a/src/parser.h
+++ b/src/parser.h
@@ -2,6 +2,8 @@
 #define PARSER_H
 
 long expression();
+long logical_or();
+long logical_and();
 long relational();
 long add();
 long term();
diff --git a/src/tokenizer.c b/src/tokenizer.c
index 03de7bd..0819871 100644
--- a/src/tokenizer.c
+++ b/src/tokenizer.c
@@ -34,11 +34,14 @@ void tokenize(char *src) {
 
             if (!strcmp(buf, "int")) t->type = Int;
             else if (!strcmp(buf, "char")) t->type = Char;
+            else if (!strcmp(buf, "double")) t->type = Double;
             else if (!strcmp(buf, "if")) t->type = If;
             else if (!strcmp(buf, "else")) t->type = Else;
             else if (!strcmp(buf, "while")) t->type = While;
             else if (!strcmp(buf, "return")) t->type = Return;
             else if (!strcmp(buf, "printf")) t->type = Printf;
+            else if (!strcmp(buf, "break")) t->type = Break;
+            else if (!strcmp(buf, "continue")) t->type = Continue;
             else t->type = Id;
 
             t->val = len;
@@ -46,9 +49,20 @@ void tokenize(char *src) {
             continue;
         }
 
-        if (isdigit(*s)) {
-            t->type = Num;
-            t->val = strtol(s, &s, 10);
+        if (isdigit(*s) || (*s == '.' && s[1] && isdigit(s[1]))) {
+            char *start = s;
+            int has_dot = 0;
+            while (*s && (isdigit(*s) || (*s == '.' && !has_dot))) {
+                if (*s == '.') has_dot = 1;
+                s++;
+            }
+            if (has_dot) {
+                t->type = Dbl;
+                t->dval = strtod(start, NULL);
+            } else {
+                t->type = Num;
+                t->val = strtol(start, NULL, 10);
+            }
             continue;
         }
 
diff --git a/src/types.h b/src/types.h
index 47bc28c..c762678 100644
--- a/src/types.h
+++ b/src/types.h
@@ -8,13 +8,14 @@
 #define STR_POOL_SIZE 100000
 
 enum {
-    Num = 128, Str, Id, Int, Char, Else, If, While, Return, Printf,
-    Assign, Eq, Ne, Lt, Gt, Le, Ge, Or, And, Inc, Dec
+    Num = 128, Dbl, Str, Id, Int, Char, Double, Else, If, While, Return, Printf,
+    Assign, Eq, Ne, Lt, Gt, Le, Ge, Or, And, Inc, Dec, Break, Continue
 };
 
 typedef struct {
     int type;
     long val;
+    double dval;
     char *text;
 } Token;
 
diff --git a/tests/break_continue_test.rc b/tests/break_continue_test.rc
new file mode 100644
index 0000000..f72ba00
--- /dev/null
+++ b/tests/break_continue_test.rc
@@ -0,0 +1,81 @@
+int main() {
+    printf("=== Break and Continue Tests ===\n");
+
+    printf("Test 1: Break statement\n");
+    int count = 0;
+    while (count < 10) {
+        count = count + 1;
+        if (count == 5) {
+            printf("Breaking at count = %d\n", count);
+            break;
+        }
+        printf("count = %d\n", count);
+    }
+    printf("Final count after break: %d\n", count);
+    printf("PASS: Break works\n");
+
+    printf("Test 2: Continue statement\n");
+    int i = 0;
+    int sum = 0;
+    while (i < 10) {
+        i = i + 1;
+        if (i == 3 || i == 7) {
+            printf("Skipping i = %d\n", i);
+            continue;
+        }
+        sum = sum + i;
+        printf("Adding i = %d, sum = %d\n", i, sum);
+    }
+    printf("Final sum (skipped 3 and 7): %d\n", sum);
+    printf("PASS: Continue works\n");
+
+    printf("Test 3: Break in nested if\n");
+    int j = 0;
+    while (j < 10) {
+        j = j + 1;
+        if (j > 3) {
+            if (j == 6) {
+                printf("Breaking at j = %d (nested if)\n", j);
+                break;
+            }
+        }
+        printf("j = %d\n", j);
+    }
+    printf("Final j: %d\n", j);
+    printf("PASS: Nested break works\n");
+
+    printf("Test 4: Continue in nested if\n");
+    int k = 0;
+    int even_sum = 0;
+    while (k < 10) {
+        k = k + 1;
+        if (k > 0) {
+            int rem = k - (k / 2) * 2;
+            if (rem == 1) {
+                continue;
+            }
+        }
+        even_sum = even_sum + k;
+    }
+    printf("Sum of even numbers 1-10: %d\n", even_sum);
+    printf("PASS: Nested continue works\n");
+
+    printf("Test 5: Multiple breaks and continues\n");
+    int n = 0;
+    int result = 0;
+    while (n < 20) {
+        n = n + 1;
+        if (n < 5) {
+            continue;
+        }
+        if (n > 15) {
+            break;
+        }
+        result = result + 1;
+    }
+    printf("Numbers counted between 5 and 15: %d\n", result);
+    printf("PASS: Multiple break/continue works\n");
+
+    printf("\n=== All Break/Continue Tests Completed ===\n");
+    return 0;
+}
diff --git a/tests/break_test1.rc b/tests/break_test1.rc
new file mode 100644
index 0000000..e96485e
--- /dev/null
+++ b/tests/break_test1.rc
@@ -0,0 +1,14 @@
+int main() {
+    printf("=== Break Test ===\n");
+    int count = 0;
+    while (count < 10) {
+        count = count + 1;
+        if (count == 5) {
+            printf("Breaking at count = %d\n", count);
+            break;
+        }
+        printf("count = %d\n", count);
+    }
+    printf("Final count: %d\n", count);
+    return 0;
+}
diff --git a/tests/break_test2.rc b/tests/break_test2.rc
new file mode 100644
index 0000000..f8c43f6
--- /dev/null
+++ b/tests/break_test2.rc
@@ -0,0 +1,13 @@
+int main() {
+    printf("=== Break Test ===\n");
+    int count = 0;
+    while (count < 10) {
+        count = count + 1;
+        if (count == 5) {
+            break;
+        }
+        printf("count = %d\n", count);
+    }
+    printf("Final count: %d\n", count);
+    return 0;
+}
diff --git a/tests/continue_or_test.rc b/tests/continue_or_test.rc
new file mode 100644
index 0000000..52d0e2d
--- /dev/null
+++ b/tests/continue_or_test.rc
@@ -0,0 +1,14 @@
+int main() {
+    printf("Test OR with continue\n");
+    int i = 0;
+    while (i < 10) {
+        i = i + 1;
+        if (i == 3 || i == 7) {
+            printf("Skip %d\n", i);
+            continue;
+        }
+        printf("i = %d\n", i);
+    }
+    printf("Done\n");
+    return 0;
+}
diff --git a/tests/continue_test_simple.rc b/tests/continue_test_simple.rc
new file mode 100644
index 0000000..55801b4
--- /dev/null
+++ b/tests/continue_test_simple.rc
@@ -0,0 +1,14 @@
+int main() {
+    printf("Start\n");
+    int i = 0;
+    while (i < 5) {
+        i = i + 1;
+        if (i == 3) {
+            printf("Skipping i = %d\n", i);
+            continue;
+        }
+        printf("i = %d\n", i);
+    }
+    printf("Done\n");
+    return 0;
+}
diff --git a/tests/double_test.rc b/tests/double_test.rc
new file mode 100644
index 0000000..567fdc5
--- /dev/null
+++ b/tests/double_test.rc
@@ -0,0 +1,53 @@
+int main() {
+    printf("=== Double Data Type Tests ===\n");
+
+    printf("Test 1: Double variable declaration and assignment\n");
+    double pi = 3.14159;
+    printf("pi = %f\n", pi);
+    printf("PASS: Double variable works\n");
+
+    printf("Test 2: Double arithmetic using helper functions\n");
+    double a = 10.5;
+    double b = 2.5;
+    printf("a = %f, b = %f\n", a, b);
+
+    double sum = double_add(a, b);
+    printf("a + b = %f\n", sum);
+
+    double diff = double_sub(a, b);
+    printf("a - b = %f\n", diff);
+
+    double prod = double_mul(a, b);
+    printf("a * b = %f\n", prod);
+
+    double quot = double_div(a, b);
+    printf("a / b = %f\n", quot);
+    printf("PASS: Double arithmetic works\n");
+
+    printf("Test 3: Type conversions\n");
+    int x = 42;
+    double dx = int_to_double(x);
+    printf("int %d converted to double: %f\n", x, dx);
+
+    double y = 99.9;
+    int iy = double_to_int(y);
+    printf("double %f converted to int: %d\n", y, iy);
+    printf("PASS: Type conversions work\n");
+
+    printf("Test 4: Double with mathematical functions\n");
+    double num = 16.0;
+    double sq = sqrt(double_to_int(num));
+    double sq_double = int_to_double(sq);
+    printf("sqrt(%f) = %f\n", num, sq_double);
+    printf("PASS: Math functions work with doubles\n");
+
+    printf("Test 5: Complex calculation\n");
+    double radius = 5.0;
+    double pi2 = 3.14159;
+    double area = double_mul(pi2, double_mul(radius, radius));
+    printf("Circle area (r=%f): %f\n", radius, area);
+    printf("PASS: Complex calculations work\n");
+
+    printf("\n=== All Double Tests Completed ===\n");
+    return 0;
+}
diff --git a/tests/file_io_test.rc b/tests/file_io_test.rc
new file mode 100644
index 0000000..cc50460
--- /dev/null
+++ b/tests/file_io_test.rc
@@ -0,0 +1,82 @@
+int main() {
+    printf("=== File I/O Tests ===\n");
+
+    printf("Test 1: Writing to a file\n");
+    int f = fopen("test_output.txt", "w");
+    if (f == 0) {
+        printf("ERROR: Could not open file for writing\n");
+        return 1;
+    }
+    fputs(f, "Hello, File I/O!\n");
+    fputs(f, "This is line 2.\n");
+    fputs(f, "Testing file operations.\n");
+    fclose(f);
+    printf("PASS: File written successfully\n");
+
+    printf("Test 2: Reading from file using fgets\n");
+    f = fopen("test_output.txt", "r");
+    if (f == 0) {
+        printf("ERROR: Could not open file for reading\n");
+        return 1;
+    }
+    char *line1 = fgets(f, 256);
+    printf("Line 1: %s", line1);
+    char *line2 = fgets(f, 256);
+    printf("Line 2: %s", line2);
+    char *line3 = fgets(f, 256);
+    printf("Line 3: %s", line3);
+    fclose(f);
+    printf("PASS: File read successfully\n");
+
+    printf("Test 3: File position operations\n");
+    f = fopen("test_output.txt", "r");
+    if (f == 0) {
+        printf("ERROR: Could not open file\n");
+        return 1;
+    }
+    int pos = ftell(f);
+    printf("Initial position: %d\n", pos);
+    fseek(f, 7, SEEK_SET());
+    pos = ftell(f);
+    printf("Position after seek: %d\n", pos);
+    char *partial = fgets(f, 256);
+    printf("Read after seek: %s", partial);
+    fclose(f);
+    printf("PASS: File positioning works\n");
+
+    printf("Test 4: End of file detection\n");
+    f = fopen("test_output.txt", "r");
+    if (f == 0) {
+        printf("ERROR: Could not open file\n");
+        return 1;
+    }
+    int line_count = 0;
+    while (feof(f) == 0) {
+        char *line = fgets(f, 256);
+        if (strlen(line) > 0) {
+            line_count = line_count + 1;
+        }
+    }
+    printf("Total lines read: %d\n", line_count);
+    fclose(f);
+    printf("PASS: EOF detection works\n");
+
+    printf("Test 5: File rename operation\n");
+    int result = frename("test_output.txt", "test_renamed.txt");
+    if (result == 0) {
+        printf("PASS: File renamed successfully\n");
+    } else {
+        printf("ERROR: File rename failed\n");
+    }
+
+    printf("Test 6: File removal\n");
+    result = fremove("test_renamed.txt");
+    if (result == 0) {
+        printf("PASS: File removed successfully\n");
+    } else {
+        printf("ERROR: File removal failed\n");
+    }
+
+    printf("\n=== All File I/O Tests Completed ===\n");
+    return 0;
+}
diff --git a/tests/or_test.rc b/tests/or_test.rc
new file mode 100644
index 0000000..6c68e98
--- /dev/null
+++ b/tests/or_test.rc
@@ -0,0 +1,9 @@
+int main() {
+    printf("Test OR\n");
+    int i = 3;
+    if (i == 3 || i == 7) {
+        printf("Match\n");
+    }
+    printf("Done\n");
+    return 0;
+}
diff --git a/tests/simple_break_test.rc b/tests/simple_break_test.rc
new file mode 100644
index 0000000..09b6aff
--- /dev/null
+++ b/tests/simple_break_test.rc
@@ -0,0 +1,13 @@
+int main() {
+    printf("Start\n");
+    int i = 0;
+    while (i < 5) {
+        i = i + 1;
+        printf("i = %d\n", i);
+        if (i == 3) {
+            break;
+        }
+    }
+    printf("After loop, i = %d\n", i);
+    return 0;
+}