C - Test letter range

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Description

Test letter range

Demo

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

  printf("Enter an upper case letter:");         // Prompt for input
  scanf(" %c", &letter);                         // Read the input character

  if((letter >= 'A') && (letter <= 'Z'))         // Verify uppercase letter
  {/*from  w  w  w .jav  a 2s.co  m*/
    letter += 'a'-'A';                           // Convert to lowercase
    printf("You entered an uppercase %c.\n", letter);
  }
  else
    printf("You did not enter an uppercase letter.\n");
  return 0;
}

Result

The following expressing converts uppercase to lowercase: 

letter += 'a'-'A';                               // Convert to lowercase