9+20

#include <iostream>

int main() {
    int result = 9 + 20;
    std::cout << "The result is: " << result << std::endl;
    return 0;
}

Explanation:

1. #include <iostream>: Includes the input/output stream library.

2. int main() {: Starts the main function.

3. int result = 9 + 20;: Declares an integer variable named result and assigns it the value of the sum of 9 and 20.

4. std::cout << "The result is: " << result << std::endl;: Outputs the text "The result is: " followed by the value stored in the result variable to the standard output.

5. return 0;: Indicates successful program execution by returning 0 to the operating system, implying that the program ended without errors.