Where does C language return return to?

c language return returns to where

c language return returns to the upper level, such as a recursive program, from the third level Return to the second level; for example, if it is an ordinary subroutine, then return to the main program.

The return in the main program is returned to the operating system.

For example, the following C program

int sum(int a, int b) {
        return a + b;
}
int main(int argc, char const *argv[])
{
        int c = sum(1000, 24);
        return 0;
}

The main function calls the sum function, the return of sum is returned to main, and the return in main is returned to the operating system. You can use echo $ under Linux system ?Query this value.

$? represents the exit status of the last command. The success value is 0, and the unsuccessful value is non-0! , using return 0 in a C program means that the program is running normally and there are no errors.

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