C program for testing the character type

There are some predefined functions available in "ctype.h" library for analyzing the character input and converting them.

Analysis Functions

The character analysis functions are listed below −

Converting Functions

The converting functions are listed below −

Program

Following is the C program for character analysis and conversion functions which are used to test the character type −

 Live Demo

#include <stdio.h>
#include <ctype.h>
main(){
   char character;
   printf("Press any key digit or alphabet
");
   character = getchar();
   if (isalpha(character) > 0)
      printf("The character is a letter.");
   else
      if (isdigit (character) > 0)
         printf("The character is a digit.");
      else
   printf("The character is not alphanumeric.");
}

Output

When the above program is executed, it produces the following result −

Run 1:
Press any key digit or alphabet
3
The character is a digit.
Run 2:
Press any key digit or alphabet
G
The character is a letter.
Run 3:
Press any key digit or alphabet
&
The character is not alphanumeric.