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Returns control from a function to its caller.

If return has an operand, the operand is converted to the function’s return type, and the converted value is returned to the caller.

int f() {
    return 42;
int x = f(); // x is 42
int g() {
    return 3.14;
int y = g(); // y is 3

If return does not have an operand, the function must have void return type. As a special case, a void-returning function can also return an expression if the expression has type void.

void f(int x) {
    if (x < 0) return;
    std::cout << sqrt(x);
int g() { return 42; }
void h() {
    return f(); // calls f, then returns
    return g(); // ill-formed

When main returns, std::exit is implicitly called with the return value, and the value is thus returned to the execution environment. (However, returning from main destroys automatic local variables, while calling std::exit directly does not.)

int main(int argc, char** argv) {
    if (argc < 2) {
        std::cout << "Missing argument\n";
        return EXIT_FAILURE; // equivalent to: exit(EXIT_FAILURE);

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