Program 33: Bad Characters

The following program should output ABC. What does it really do?

  1 /************************************************
  2  * Toy program to print three characters.       *
  3  ************************************************/
  4 #include <iostream>
  5
  6 int main()
  7 {
  8     //A character to be printed
  9     char ch = 'A';
 10
 11     std::cout << ch;        // Output A
 12     std::cout << ch+1;      // Output B
 13     std::cout << ch+2;      // Output C
 14     std::cout << std::endl;
 15     return (0);
 16 }

(Next Hint 124. Answer 45.)