Check if input character is letter, number or special character in C

In this section, we will see how to check whether a given character is a number, letter or some special character in C.

The alphabet is from A – Z and a – z, then the numbers are 0 – 9. All other characters are special characters. So if we check the conditions using these we can find them easily.

Example

#include <stdio.h>
#include <conio.h>
main() {
   char ch;
   printf("Enter a character: ");
   scanf("%c", &ch);
   if((ch >= &#39;A&#39; && ch <= &#39;Z&#39;) || (ch >= &#39;a&#39; && ch <= &#39;z&#39;))
      printf("This is an alphabet");
   else if(ch >= &#39;0&#39; && ch <= &#39;9&#39;)
      printf("This is a number");
   else
      printf("This is a special character");
}

Output

Enter a character: F
This is an alphabet

Output

Enter a character: r
This is an alphabet

Output

Enter a character: 7
This is a number

Output

Enter a character: #
This is a special character

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