Private self-hosted questions and answers for your enterpriseProgramming and related technical career opportunitiesIn the Unix shell, it allows you to tell whether the command succeeded or not, and maybe why it failed if it failed. By clicking “Post Your Answer”, you agree to our To subscribe to this RSS feed, copy and paste this URL into your RSS reader.

The logical operators &&, || and ! The void type is an incomplete type that cannot be completed. return 0 from int main() in c programming. And all Under windows you can test for return value as follows (in batch script):Finally, control is returned to the host environment. your coworkers to find and share information. It is used as the return type for functions that do not return a value." Stack Overflow works best with JavaScript enabled This isn't used in PHP, because if a function is doesn't have a return, a value NULL is automatically returned. Private self-hosted questions and answers for your enterpriseProgramming and related technical career opportunitiesIs it the same to say "parent process" than "calling function"? Stack Overflow for Teams is a private, secure spot for you and share | improve this answer | follow | edited Aug 7 '13 at 8:15. Stack Overflow for Teams is a private, secure spot for you and Free 30 Day Trial

Because zero is a signal, arbitrarily designated, to inform the system that your code has ended without any error. What those return values mean is entirely up to the programmer. @Johnsyweb: True, but AFAIK those three are the three portable return codes mentioned in the ISO C++ standard. are less fussy about their operands; they treat 0 as false and any non-zero value as true. Stack Overflow works best with JavaScript enabled The Overflow Blog In C++, return exp; (where exp is an expression) is a statement that tells a function to return execution of the program to the calling function, and report the value of exp.If a function has the return type void, the return statement can be used without a value, in which case the program just breaks out of the current function and returns to the calling one. Private self-hosted questions and answers for your enterpriseProgramming and related technical career opportunitiesDon't know about C but some languages need a :void (as :Number or :String) in functions that don't return values.post the function signature. In computer programming, a return statement causes execution to leave the current subroutine and resume at the point in the code immediately after the instruction which called the subroutine, known as its return address. Then main returns a value of 0 (typically used to report success) to end the program. your coworkers to find and share information. Not all functions Functions in C return int by default, if no other return type is defined. Featured on Meta Does it look like one of the following three? Featured on Meta When B exits, it will always store a kind of "exit status" somewhere (which is what main returned, or what your program actually gave as a parameter to your Thank you! It had some highly relevant answers. My fault, not yours.Using this analogy what would a 1 be? site design / logo © 2020 Stack Exchange Inc; user contributions licensed under If there is an observing process (like if one program launches another) it can be an easy way to get communicate a status or error code.For a simple application which does not have an status or error codes, most people On a modern operating system, every program will exit with a specific "exit code".DISCLAIMER NO 1.: The actual specification of that concept (of having an exit code at all) is out of the scope of any programming language specification at all. (I'm talking about the value returned to the OS from main, exit or similar calls).