Thread: What's wrong with my code (HELP)

hi, can you guys help me out with this portion of code. I don't know what's wrong with it.

Code:

#include <stdio.h>
#include <math.h>

main()
{
  int count;
  float ctr,a;
  char x,s,S,c,C,q,Q;

  do{
    printf("(S)ine, (C)osine, or (Q)uit: ");
    scanf("%c", &x);
    if(x!='s' && x!='S' && x!='c' && x!='C' && x!='q' && x!='Q')
      printf(" -- Illegal Input!\n");
  } while(x!='s' && x!='S' && x!='c' && x!='C' && x!='q' && x!='Q');
}

it is supposed to print out this:

Code:

(S)ine, (C)osine, or (Q)uit: x
 -- Illegal Input!
(S)ine, (C)osine, or (Q)uit:

but it prints this out:

Code:

 (S)ine, (C)osine, or (Q)uit: x
 -- Illegal Input!
(S)ine, (C)osine, or (Q)uit:  -- Illegal Input!
(S)ine, (C)osine, or (Q)uit:

it prints out an extra line of sine, cosine, or quit with the illegal input statement after that. What did i do wrong? Help!!