C Program to Check Character is Alphabet Digit or Special Character

How to write a C Program to Check Character is Alphabet Digit or Special Character with an example. For this, we are going to use the Built-in function isalpha, isdigit, and ASCII Codes.

C Program to Check Character is Alphabet Digit or Special Character Example 1

This C program allows the user to enter one character. And then, it will check whether the character is Alphabet, digit, or Special Characters.

In this example, we are going to use built-in functions isalpha, and isdigit to check whether the character is Alphabet or Digit

/* C Program to check Character is Alphabet Digit or Special Character */
 
#include <stdio.h>
 
int main()
{
	char ch;
  	
	printf(" Please Enter any character :  ");
  	scanf("%c", &ch);
  
  	if (isalpha(ch))
  	{
  		printf("\n %c is an Alphabet", ch);  	
  	} 
  	else if (isdigit(ch))
  	{
  		printf("\n %c is a Digit", ch);  	
  	}
  	else
    	printf("\n %c is a Special Character", ch);
  
  	return 0;
}

OUTPUT

Let us check whether 9 is an Alphabet or Digit or Special Character

Let us check Special Character

Program to Check Character is Alphabet Digit or Special Character Example 2

In this program, to check Alphabet, digit or special character, we are using the alphabets and digits directly inside the Else If Statement.

/* C Program to check Character is Alphabet Digit or Special Character */
 
#include <stdio.h>
 
int main()
{
  	char ch;
  	
  	printf(" Please Enter any character :  ");
  	scanf("%c", &ch);
  
  	if( (ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z') )
  	{
  		printf("\n %c is an Alphabet", ch);  	
 	}
  	else if (ch >= '0' && ch <= '9')
  	{
  		printf("\n %c is a Digit", ch);  	
  	}    
  	else
    	printf("\n %c is a Special Character", ch);
  
  	return 0;
}

OUTPUT

Program to Check Character is Alphabet Digit or Special Character Example 3

In this program, we are using the ASCII Table values to check whether the input character is Alphabet or Digit or special character.

/* C Program to check Character is Alphabet Digit or Special Character */
 
#include <stdio.h>
 
int main()
{
  	char ch;
  	
  	printf(" Please Enter any character :  ");
  	scanf("%c", &ch);
  
 	if (ch >= 48 && ch <= 57)
  	{
  		printf("\n %c is a Digit", ch);  	
  	}
  	else if ( (ch >= 65 && ch <= 90) || (ch >= 97 && ch <= 122) )
  	{
  		printf("\n %c is an Alphabet", ch);  	
  	}    
  	else
    	printf("\n %c is a Special Character", ch);
  
  	return 0;
}

OUTPUT

Let us check whether 3 is a Digit or not

Let us check whether $ is a special character or not