Do I need to return 0 in C?

No, its not necessary. Here int is the return type of the main program. The main function returns nothing generally, thus we are writing ‘return 0’ at the end of it. Here the return type of the main function is void, which means that the function does not returns anything.

What is difference between return 0 and exit 0?

Keyword ‘return’ causes the current function to return the control to the calling function. While the function exit(0) terminates the executing C program (process) and returns control to the operating system, with 0 as the exit status of main.

Is return mandatory in C?

It is never mandatory. If the function does not return a value, you need not use a return statement and can just let the function go on to the closing “ } ”.

Is return compulsory in C?

As a good engineering practice, always specify a return type for your functions. If a return value isn’t required, declare the function to have void return type. If a return type isn’t specified, the C compiler assumes a default return type of int . In a main function, the return statement and expression are optional.

Why we use void main in C?

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().

Does Exit 1 return a value?

What is the difference between exit(0) and exit(1) in C language? exit(1) (usually) indicates unsucessful termination. 0 and EXIT_SUCCESS are the values specified by the standard to indicate successful termination, however, only EXIT_FAILURE is the standard value for returning unsucessful termination.

What does it mean to return 0 in C++?

The return value of the main function is considered the “Exit Status” of the application. On most operating systems returning 0 is a success status like saying “The program worked fine”. In C++ it is optional to type “return 0;” at the end of the main function and the compiler includes it automatically.

What happens when return 0 is placed in the main function?

In your case,since return 0 is placed in main ,the program will exit. return will terminate the execution of the function and returns control to the calling function. When it is placed in main , it will exit the program.

How can we use exit_success instead of return 0?

We can use EXIT_SUCCESS instead of return 0 to indicate successful execution of program and EXIT_FAILURE instead of non zero value to indicate failure of program’s execution. Hello, World!

What does it mean when a program returns a 0 value?

But returned value indicates program’s success or failure to the operating system and there is only one value that is 0 which can indicate success and other non zero values can indicate failure of execution due to many reasons.