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Code Examples

Short, runnable examples for the basics. Choose a language and open any example in the compiler.

  1. Hello, World!

    Every language starts here: print a message to the screen to check that everything works.

    #include <iostream>

int main() {
    std::cout << "Hello, World!" << std::endl;
    return 0;
}
    Open in compiler

  2. Variables

    Variables store values such as text, whole numbers and decimals so you can reuse them.

    #include <iostream>
#include <string>

int main() {
    std::string name = "Ada";
    int age = 21;
    double height = 1.75;
    std::cout << name << " " << age << " " << height << std::endl;
    return 0;
}
    Open in compiler

  3. Conditions

    if / else lets your program choose a path depending on a value.

    #include <iostream>

int main() {
    int age = 18;
    if (age >= 18) {
        std::cout << "Adult" << std::endl;
    } else if (age >= 13) {
        std::cout << "Teenager" << std::endl;
    } else {
        std::cout << "Child" << std::endl;
    }
    return 0;
}
    Open in compiler

  4. Loops

    Loops repeat a block of code: use for when you know the count and while when you wait for a condition.

    #include <iostream>

int main() {
    for (int i = 1; i <= 5; i++) {
        std::cout << i << std::endl;
    }
    int n = 3;
    while (n > 0) {
        std::cout << "Countdown " << n-- << std::endl;
    }
    return 0;
}
    Open in compiler

  5. Functions

    A function packs code into a reusable block that takes inputs and returns a result.

    #include <iostream>

int add(int a, int b) {
    return a + b;
}

int main() {
    std::cout << add(2, 3) << std::endl;
    return 0;
}
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  6. Fibonacci sequence

    Each number is the sum of the two before it. A classic exercise that combines variables, loops and arithmetic.

    #include <iostream>

int main() {
    int a = 0, b = 1;
    for (int i = 0; i < 10; i++) {
        std::cout << a << " ";
        int next = a + b;
        a = b;
        b = next;
    }
    return 0;
}
    Open in compiler
Code Examples | My Compiler