[Solved] Unclear about return value of a void function in C [closed]

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The result in this situation is based on whats on top of the stack when test() is returned. The behaviour is undefined.

You should compile your code with warnings enabled:

gcc main.c -Wall

Also, altering your argv pointer is a bit dirty. De-referencing argv directly communicates your intentions in a clear way:

printf("\n%d\n", test(atoi(*++argv), 2));
printf("\n%d\n", test(2, atoi(*argv)));

Should be:

printf("\n%d\n", test( atoi(argv[1]), 2) );
printf("\n%d\n", test( 2, atoi(argv[1]) ) );

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solved Unclear about return value of a void function in C [closed]