In the code below, when I change the declaration of "isuit" from "char" to "int", the result differ.  

I thought int and char is the same in the essense, so I cannot figure out why.

```
#include <iostream>
#include <cstdio>
using namespace std;

int main()
{
    int     n, irank;
    int cards[4][13] = {};
    char    isuit;
    cin >> n;

    for (int i = 0; i < n; i++) {
        cin >> isuit >> irank;
        switch (isuit)
        {
            case 'S':
                cards[0][irank - 1]++;
                break;
            case 'H':
                cards[1][irank - 1]++;
                break;
            case 'C':
                cards[2][irank - 1]++;
                break;
            case 'D':
                cards[3][irank - 1]++;
                break;
        }
    }
    for (int i = 0; i < 4; i++) {
        for (int j = 0; j < 13; j++) {
            if (!cards[i][j]) {
                switch (i)
                {
                    case 0:
                        cout << "S" << " " << j + 1 << endl;
                        break;
                    case 1:
                        cout << "H" << " " << j + 1 << endl;
                        break;
                    case 2:
                        cout << "C" << " " << j + 1 << endl;
                        break;
                    case 3:
                        cout << "D" << " " << j + 1 << endl;
                        break;
                }
            }
        }
    }
    return 0;
}

```

Example input:

> 
> 47
> S 10
> S 11
> S 12
> S 13
> H 1
> H 2
> S 6
> S 7
> S 8
> S 9
> H 6
> H 8
> H 9
> H 10
> H 11
> H 4
> H 5
> S 2
> S 3
> S 4
> S 5
> H 12
> H 13
> C 1
> C 2
> D 1
> D 2
> D 3
> D 4
> D 5
> D 6
> D 7
> C 3
> C 4
> C 5
> C 6
> C 7
> C 8
> C 9
> C 10
> C 11
> C 13
> D 9
> D 10
> D 11
> D 12
> D 13
> 
> 
> 

output when char:

> 
> S 1
> H 3
> H 7
> C 12
> D 8
> 
> 
> 

output when int:

> 
> S 1
> S 2
> S 3
> S 4
> S 5
> S 6
> S 7
> S 8
> S 9
> S 10
> S 11
> S 12
> S 13
> H 1
> H 2
> H 3
> H 4
> H 5
> H 6
> H 7
> H 8
> H 9
> H 10
> H 11
> H 12
> H 13
> C 1
> C 2
> C 3
> C 4
> C 5
> C 6
> C 7
> C 8
> C 9
> C 10
> C 11
> C 12
> C 13
> D 1
> D 2
> D 3
> D 4
> D 5
> D 6
> D 7
> D 8
> D 9
> D 10
> D 11
> D 12
> D 13
> 
> 
>