print("=== Control Flow Demo ===");
print("");

print("--- If Statement ---");
x = 10;
if (x > 5) {
    print("x is greater than 5");
}

print("");
print("--- If-Else Statement ---");
y = 3;
if (y > 5) {
    print("y is greater than 5");
} else {
    print("y is not greater than 5");
}

print("");
print("--- If-Else If-Else Chain ---");
score = 85;
print("Score:", score);
if (score >= 90) {
    print("Grade: A");
} else {
    if (score >= 80) {
        print("Grade: B");
    } else {
        if (score >= 70) {
            print("Grade: C");
        } else {
            if (score >= 60) {
                print("Grade: D");
            } else {
                print("Grade: F");
            }
        }
    }
}

print("");
print("--- Nested If ---");
a = 10;
b = 20;
if (a > 0) {
    if (b > 0) {
        print("Both a and b are positive");
    }
}

print("");
print("--- While Loop ---");
print("Counting from 1 to 5:");
i = 1;
while (i <= 5) {
    print("  i =", i);
    i++;
}

print("");
print("--- While with Break Condition ---");
sum = 0;
n = 1;
while (n <= 100) {
    sum += n;
    if (sum > 50) {
        print("Sum exceeded 50 at n =", n);
        print("Final sum:", sum);
        n = 101;
    }
    n++;
}

print("");
print("--- For Loop ---");
print("For loop 0 to 4:");
for (i = 0; i < 5; i++) {
    print("  iteration", i);
}

print("");
print("--- For Loop with Step ---");
print("Counting by 2s:");
for (i = 0; i <= 10; i += 2) {
    print("  i =", i);
}

print("");
print("--- Nested Loops ---");
print("Multiplication table (3x3):");
for (i = 1; i <= 3; i++) {
    row = "";
    for (j = 1; j <= 3; j++) {
        row += str(i * j);
        if (j < 3) {
            row += "\t";
        }
    }
    print(row);
}

print("");
print("--- Loop with Array ---");
colors = {"red", "green", "blue", "yellow"};
print("Colors:");
for (i = 0; i < len(colors); i++) {
    print("  " + str(i) + ":", colors[i]);
}

print("");
print("--- Countdown ---");
print("Countdown:");
for (i = 5; i >= 1; i--) {
    print("  ", i);
}
print("  Blast off!");

print("");
print("--- While True Pattern ---");
attempts = 0;
maxAttempts = 5;
while (1) {
    attempts++;
    print("Attempt", attempts);
    if (attempts >= maxAttempts) {
        print("Max attempts reached");
        break;
    }
}

print("");
print("--- Complex Condition ---");
age = 25;
hasLicense = 1;
if (age >= 18 && hasLicense) {
    print("Can drive");
}

isMember = 0;
hasDiscount = 1;
if (isMember || hasDiscount) {
    print("Eligible for discount");
}