Prefix & Postfix Increment operators

Question

#include <iostream>
using namespace std;

int main()
{ int a=3,b=2;
b=a++; //after this value of b will be 4
cout<<++b; //here the value getting printed should be 5 but the output is 4
return 0;
}

Answer 1

Great example to explain the difference of prefix and postfix increment!

b = a++ will assign the value of a to b and then increment a. So b will be 3, but a will be 4.

cout << ++b will first increment b and then print its new value: 4.