return 0 c++

There are two different scenario return statement is used inside c++ programming. We can use return 0 c++ inside main() function or other user defined functions also. But both have different meanings.

1. return 0 c++ used inside Main function
2. return 0 c++ used inside other user defined function

What is meaning of return 0 and return 1 in c++ ?

There will be two scenario for it. Possible function can be main() function or any other user defined function.

return 0 c++ in main() function.

If c++ program is completed successfully then it will return 0 in main function.

#include <iostream>
using namespace std;

int main() {
	// Successfully completing program
	return 0;
}

return 1 c++ in main() function.

If there is some error in program or exited with error then it will return 1 in main function.

#include <iostream>
using namespace std;

int main() {
	// Errors in completing program (Exited with Error)
	return 1;
}

return 0 c++ in boolean return type function

If there is function in c++ with return type boolean then if it return 0 then it means return false. You can use this return for checking that required condition or logic is satisfied or not.

bool func(int iVal) {
	if (iVal == 2) {
		// Same as return true;
		return 1;
	}
	else {
        // Same as return false;
		return 0;
	}
}

In given function if function return 1 means value is 2 otherwise it will return 0. So we can identify by this function that given value is 2 or not.

return 1 c++ in boolean return type function

If function return 1 means our condition is satisfy and it will return true.

#include <iostream>
using namespace std;

int main() {

	// result1 is true (return 1)
	bool result1 = func(2);

	// result2 is false (return 0)
	bool result2 = func(2);

	// Successfully  completing program
	return 0;
}

bool func(int iVal) {
	if (iVal == 2) {
		return 1;
		// Same as return true;
	}
	else {
		return 0;
		// Same as return false;
	}
}

CONCLUSION:

If we want to exit our program successful then we return 0 inside main function. If there is some error during exiting program then we can return 1 inside main function. In case of other user defined functions which return boolean value. Then we can check conditioning of function using return value of function. Here if function return 1 means condition is TRUE and if function return 0 then conditions is FALSE.

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