For character input, report whether it is a letter, and its numerical location in the alphabet. - C Pointer

C examples for Pointer:Pointer Variable

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Description

For character input, report whether it is a letter, and its numerical location in the alphabet.

Demo Code

#include <stdio.h>
#include <ctype.h>

int letter_location(char ch);

int main(void)
{
  char ch;//from  ww w  .ja  v a  2  s  . com
  int location;

  while ((ch = getchar()) != EOF){
    if ((location = letter_location(ch)) == -1)
      printf("%c is not a letter\n", ch);
    else
      printf("%c is a letter: location = %d\n", ch, location);
  } 

  return 0;
}

int letter_location(char ch){
  if (isalpha(ch)){
    ch = tolower(ch);
    return (ch - 'a' + 1);
  }
  else
    return -1;
}

Result


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