[Solved] C++ // Not all control paths return a value

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Actually none of your control paths returns a value. As you only use the function to print something on the screen, it does not have to return anything. Just make the return type void:

void bounce(int n) {
    /*...*/
}

And then dont cout the result of the function call (once you make it void the function wont return anything anyhow), i.e. instead of:

std::cout << bounce(x) << std::endl;

simply write

bounce(x);

You already print on the screen inside the function.

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solved C++ // Not all control paths return a value