CODEWITHSUNDEEP
c++constants
Ninjakid
Ninjakid

Reputation: 73

case expression in c++ returns error

I was using this code as part of a 2 dimensional game, but when i tried compiling it, it returned the following error:

error C2051: case expression not constant.

This is my code:

switch(_getch()){
  case "w":
    dir = UP;
    break;
  case "a":
    dir = LEFT;
    break;
  case "s":
    dir = DOWN;
    break;
  case "d":
    dir = RIGHT;
    break;
  default:
    break;
}

Upvotes: 1

Views: 225

Answers (1)

krzaq
krzaq

Reputation: 16431

You should use character literals ('w') instead of string literals ("w") in switch cases:

case 'w':
    dir = UP;
    break;

"w" is a string literal, which would decay to a char const* pointer. switch cases cannot be anything other than a constant integer, an enum or a class with a single non-explicit integer or enum conversion operator. A pointer to char is none of those.

Upvotes: 1

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