What is difference between void and int

Answer 1

As a return type? void means that the function doesn't return anything. int means that the function returns an integer:

int add(int a, int b) {
return a + b; // <<== return value of the function is an integer
}

void say_hello(string name) {
cout << "Hello " << name; // <<== this function doesn't return any value, its return type is void
}

Answer 2

Void - null result
Int - integer result