C Programs

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Decision Making Programs in C

Check whether a character is a digit or special character

Introduction

In C programming, characters fall into one of these categories:

• Alphabet: A–Z or a–z
• Digit: 0–9
• Special Character: Any other printable character (e.g., @, #, $, etc.)

We can determine the type of character using conditional statements and ASCII value ranges.

C Program: Check whether a character is a digit or special character

#include <stdio.h>
 
int main() {
    char ch;
 
    // Input character
    printf("Enter a character: ");
    scanf("%c", &ch);
 
    // Check type of character
    if ((ch >= 'A' && ch <= 'Z') || (ch >= 'a' && ch <= 'z')) {
        printf("%c is an Alphabet.\n", ch);
    }
    else if (ch >= '0' && ch <= '9') {
        printf("%c is a Digit.\n", ch);
    }
    else {
        printf("%c is a Special Character.\n", ch);
    }
 
    return 0;
}
  

 
OUTPUT 1 :
Enter a character: G
G is an Alphabet.

OUTPUT 2 :
Enter a character: 7
7 is a Digit.

OUTPUT 3 :
Enter a character: @
@ is a Special Character.

Explanation

1. Program accepts a single character from the user.
2. It checks:
   • If character is between A–Z or a–z → Alphabet
   • Else if character is between 0–9 → Digit
   • Else → Special Character
3. The result is displayed accordingly.