error about main() in playground console

Question

#include <iostream>
using namespace std;

void main(void)
{
cout << "Hello world!" << endl;
cout << "I love programming!";
}
why can't playground console run the void main() block ? the main() must be int class and return int number?

Answer 1

use

int main ()

not

void main(void)

Use void for a message inside a class.

Copy this for void to work.

https://code.sololearn.com/cx5hj7AO1856/?ref=app

Answer 2

The error message is pretty explicit: "error: '::main' must return 'int'"

As it says, the main function must return an integer as this is part of the C++ standard. While some compilers will ignore it (they'll automatically add a return value of 0 to your program), it's technically incorrect.

The reason you return anything to begin with is to indicate to the operating system that the program either executed successfully (0), or ran into an error (anything else).

Answer 3

according to new rules of c++ there are some changes in it's standards. now you can't use void data type as main function you must use int as data type. so new compilers show error when void is used

Answer 4

Yes, the main function must return an int. The reason is to give useful signals to the caller (system) when the program is terminated.