c - So what does "return 0" actually mean? - Stack Overflow
2013年2月18日 · For historic reasons, it is possible to write return 0; to return from a function that has been declared as void, like so: void foo( /* arguments */ ) { /* do things */ return 0; } This does nothing, and the 0 (or whatever you put there) is thrown away. Also, sensible compilers will give you a warning message if you do this. So don't do this.
What is the significance of return 0 in C and C++? [duplicate]
2014年1月4日 · The main function is generally supposed to return a value and after it returns something it finishes execution.The return 0 means success and returning a non-zero number means failure. Thus we "return 0" at the end of main function. But you can run the main function without the return 0.It works the same .
In the main function of a C++ program, what does `return 0` do …
2012年1月2日 · [C++11: 3.6.1/5]: A return statement in main has the effect of leaving the main function (destroying any objects with automatic storage duration) and calling std::exit with the return value as the argument. If control reaches the end of main without encountering a return statement, the effect is that of executing return 0; [C++11: 18.5/8]:
Difference between return 1, return 0, return -1 and exit?
2014年3月24日 · return n from your main entry function will terminate your process and report to the parent process (the one that executed your process) the result of your process. 0 means SUCCESS. Other codes usually indicates a failure and its meaning.
Difference between return 0; and return (0); - CS50 Stack Exchange
2016年6月7日 · int foo(int x) { return (x + x); } But it's the exact same thing. If you want to use this convention, I would suggest you leave a space between the return keyword and the expression to be returned (as you correctly have done), so that it's not confused with a function by someone who is still a beginner. So use. return (0); instead of. return(0);
c - Why is return 0 optional? - Stack Overflow
If the return type of the main function is a type compatible with int, a return from the initial call to the main function is equivalent to calling the exit function with the value returned by the main function as its argument; reaching the } that terminates the main function returns a value of 0. If the return type is not compatible with int ...
Why return 0 from main() in a C program? - Stack Overflow
2014年2月1日 · Returning zero from main() does not have to return zero to the host environment. From the C90/C99/C++98 standard document: If the value of status is zero or EXIT_SUCCESS, an implementation-defined form of the status successful termination is returned.
c - Difference between "return 0" and "exit (0)" - Stack Overflow
return is a statement that returns control back to the calling function. exit is a system call which terminates the current process i.e the currently executing program. In main() the return 0; and exit(0); perform the same thing. NOTE: you have to include #include<stdlib.h>.
Why do we need to use 'return 0' at the end of a function in C?
2016年11月28日 · If a function is declared as returning a type other than void, then it must have a return statement. The only exception to this is the main function, which as of C99, can omit the return statement (when it is omitted, the behaviour is the same as if there was a return 0; statement before the closing } of main). Consider this erroneous test ...
Should I return 0 or 1 for successful function? [duplicate]
The reason why main use 0 for success is that it is used as the exit code of the application to the operating system, where 0 typically means success and 1 (or higher) means failure. (Of course, you should always use the predefined macros EXIT_SUCCESS and EXIT_FAILURE .)