Ошибка main must return int

The error message is trying to tell you that main must return int. return 0; is superfluous – main (and only main) returns 0 by default when the end of the function is reached. For people who are new to programming who may not know that it is a good habbit to get into.

Does main have to return int?

The main function should always return an int. In environments that have an operating system (OS), the OS starts your program running. The integer value returned from main provides a way for your program to return a value to the OS indicating whether the program succeeded, failed, or generated some integer result.

Does main return int in C?

void main(void) : It denotes empty, it means no value is returned which is also accepted in our programming language. 2. int main() : It return some value like Zero or Non-Zero. The main function is C always return an integer value and it goes as an exit code to the program which executed it.

What is difference between void main and int main?

The void main() indicates that the main() function will not return any value, but the int main() indicates that the main() can return integer type data. When our program is simple, and it is not going to terminate before reaching the last line of the code, or the code is error free, then we can use the void main().

Why do we return 0 in C?

These status codes are just used as a convention for a long time in C language because the language does not support the objects and classes, and exceptions. return 0: A return 0 means that the program will execute successfully and did what it was intended to do.

What should main return C?

What should main() return in C and C++? The return value for main is used to indicate how the program exited. If the program execution was normal, a 0 return value is used. Abnormal termination(errors, invalid inputs, segmentation faults, etc.) is usually terminated by a non-zero return.

What is the purpose of int main void?

Int main(void) is used in C to restrict the function to take any arguments, if you dont put void in those brackets, the function will take ANY number of arguments you supply at call.

Why is Main an int?

The short answer, is because the C++ standard requires main() to return int . As you probably know, the return value from the main() function is used by the runtime library as the exit code for the process. Both Unix and Win32 support the concept of a (small) integer returned from a process after it has finished.

What is int main void?

int main() indicates that the main function can be called with any number of parameters or without any parameter. On the other hand, int main(void) indicates that the main function will be called without any parameter #include int main() { static int i = 5; if (–i){ printf(“%d “, i); main(10); } }

Why void main is wrong in C?

It’s non-standard. The int returned by main() is a way for a program to return a value to the system that invokes it. On systems that doesn’t provide such a facility the return value is ignored, but that doesn’t make void main() legal. Even if your compiler accepts void main() avoid it in any case. It’s incorrect.

What’s the difference between int main and void main?

A conforming implementation may provide more versions of main (), but they must all have return type int. The int returned by main () is a way for a program to return a value to “the system” that invokes it. On systems that doesn’t provide such a facility the return value is ignored, but that doesn’t make “void main ()” legal C++ or legal C.

Is it legal to write void main ( ) in C?

*/ } A conforming implementation may provide more versions of main (), but they must all have return type int. The int returned by main () is a way for a program to return a value to “the system” that invokes it. On systems that doesn’t provide such a facility the return value is ignored, but that doesn’t make “void main ()” legal C++ or legal C.

Why do I get an error with void main ( )?

However, with Xcode I’m getting an error that says, “error: ‘::main’ must return ‘int’”. Can anyone toss me some insight into why I’m getting this error, and how I may be able to correct it so that the compiler accepts main() as ‘void’?

What does’main’must return’int’in C + +?

The main function of a C++ program must return an int. This means that unlike some other programming languages, you cannot have the following: void main() {} void main(args) {} long main() {}. If you do this, you have not written a C++ program, and all respectable, ISO standard-compliant C++ compilers will reject the above code.