class Person {
    name = "Unknown";
    age = 0;
    _temp = null;

    Person(this, name, age = 18) {
        this.name = name;
        this.age = age;
    }

    ~Person(this) {
        print("Person destroyed:", this.name);
    }

    greet(this) {
        print("Hello, I am", this.name, "and I am", this.age, "years old");
    }

    setAge(this, newAge) {
        this.age = newAge;
    }
}

person = new Person("Alice", 25);
person.greet();

person2 = new Person("Bob");
person2.greet();

person.setAge(30);
print("Alice new age:", person.age);

x = 10;
y = 20;
print("Sum:", x + y);
print("Product:", x * y);

str1 = "Hello";
str2 = " World";
result = str1 + str2;
print("Concatenation:", result);

str1 += "!";
print("After +=:", str1);

count = 0;
while (count < 3) {
    print("Count:", count);
    count++;
}

for (i = 0; i < 3; i++) {
    print("For loop i:", i);
}

val = null || 5;
print("Default value:", val);

val2 = 10 || 5;
print("Existing value:", val2);

if (1) {
    print("Truthy: 1 is true");
}

if (0) {
    print("This should not print");
} else {
    print("Falsy: 0 is false");
}

arr = {1, 2, 3, 4, 5};
print("Array element 0:", arr[0]);
print("Array element 2:", arr[2]);

arr[1] = 10;
print("Modified array element 1:", arr[1]);

testStr = "hello world";
print("Substr:", testStr.substr(0, 5));
print("Count 'o':", testStr.count("o"));

parts = testStr.split(" ");
print("Split result count:", len(parts));

numStr = "42";
num = int(numStr);
print("Converted to int:", num);

converted = str(123);
print("Converted to str:", converted);

class Counter {
    value = 0;

    Counter(this, start = 0) {
        this.value = start;
    }

    increment(this) {
        this.value++;
    }

    decrement(this) {
        this.value--;
    }

    getValue(this) {
        return this.value;
    }
}

counter = new Counter(5);
print("Counter initial:", counter.getValue());
counter.increment();
counter.increment();
print("Counter after 2 increments:", counter.getValue());
counter.decrement();
print("Counter after decrement:", counter.getValue());

a = 5;
b = 5;
if (a == b) {
    print("a equals b");
}

if (a != 10) {
    print("a is not 10");
}

if (a < 10 && b < 10) {
    print("Both a and b are less than 10");
}

if (a > 10 || b < 10) {
    print("Either a > 10 or b < 10");
}

print("All tests completed successfully");