Switch and For Loop

#include<iostream.h>
main()
{
char ch;
ch = 'A';
int ans;

for (int i = 0; i !=3; i++)
{
    switch( ch ) 
    {
        case 'A':
        cout << "Case A\n";
        ans = ch + 'A';
        ch ='B';
        break;
        case 'B':
        cout << "Case B\n";
        ans = ch + 'B';
        default :
        cout << "Case Default\n";
        ans = ch + 'C';
        ch = 'G';

}

cout << ans <<"\n";
}
return 0;

}
/*
Case A
130
Case B
Case Default
133
Case Default
138
*/