C - Switch on uppercase char value

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Introduction

You can use the toupper() or tolower() function to simplify the cases in the switch.

By using one or the other you can nearly halve the number of cases:

Demo

#include <stdio.h>
#include <ctype.h>
int main(void)
{
  char answer = 0;       // Stores an input character

  printf("Enter Y or N: ");
  scanf(" %c", &answer);


  switch (toupper(answer))
  {//from   w  w  w.  j  av  a 2s.  co m
  case 'Y':
    printf("You responded in the affirmative.\n");
    break;
  case 'N':
    printf("You responded in the negative.\n");
    break;
  default:
    printf("You did not respond correctly. . .\n");
    break;
  }
  return 0;
}

Result

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