What will be the output of the following program and why?

Question

#include <iostream>
using namespace std;
 int main(){
    const int i = 20;
    const int* const ptr = &i;
    (*ptr)++;
    int j = 15;
    ptr = &j;
    cout << i;
    return 0;
}

Answer 1

yeah

Answer 2

a general question

Answer 3

Faisal Hamman Adama Muhammad it has compiler error and hence no output..
two errors are there.

1. (*ptr)++ tries to change value of i as ptr points to i.. on first line, you have declared i as constant and changing constant gives error

2. ptr =&j gives error as ptr is constant ( by declaring *const ptr ) and now you are trying to change it pointing from i to j...