Question

why we use return 0 in int main function

Answer 1

To terminate the main function because when compiler encounters return 0 , it comes out of the function and the program stops

Answer 2

There are function types that return and don't return results. main() is function that return result that is 0 (zero). If the console encounter 0, it understands that everything is successfully. You can don't use return 0 also.

Answer 3

we use main function for the execution of program if the program executes we use RETURN 0.

Answer 4

0 is similar to true usually in coding,  so if you write/run return 0, it reads as return true, which is basically the same as "exit with success" in human terms. It could also be seen as "return with 0 errors/flags."

But if there is a mistake in your code, then the compiler/interpreter automatically returns 1, with your error before or after it (usually).

:)

Answer 5

To let the compiler know if the program ran correctly. But you can try to return 1 instead of 0: this way the compiler will understand that there is an error in the program. The compiler can control the return value. For example: if it does not find a return at the end of the function: it will automatically return 0. Or, before the compilation is completed, it will return 1 if there is an error in the code. Online compilers can also read return: if the compiler returned 1, then there is an error in the code, the online compiler will immediately show where the trouble is, and if it gets 0, it will automatically execute the program and write that main() returned 0

Answer 6

return 0; is in int main() function shows that the program executed successfully. It also ensures that what you want to do is done perfectly. It denotes the execution status of the main() function.