C Program to Check Whether a Character is Alphabet or Digit

February 13, 2024February 12, 2024 by veer

Write a C program to check whether number is alphabet or digit.
Wap in C to check whether a character is alphabet or digit using isalpha and isdigit function.

Required Knowledge

C printf and scanf functions
isalpha() function in C
isdigit() function in C

C program to check whether a character is alphabet or digit

/*
 * C program to check whether a character is Alphabet or Digit 
 * or Other Graphical Character
 */ 
   
#include <stdio.h>  
   
int main() {  
    char character;
    /* 
     * Take a character as input from user 
     */
    printf("Enter a Character\n");  
    scanf("%c", &character);  
       
    if((character >='a' && character <='z')||(character >='A' && character <='Z')){  
        printf("%c is an Alphabet\n", character);  
    } else if(character >= '0' && character <= '9') {
        printf("%c is a Digit \n", character);  
    } else {
        printf("%c is a Graphical Character\n", character);  
    }
   
    return 0;  
}

Output

Enter a Character
J
J is an Alphabet

Enter a Character
8
8 is a Digit

Enter a Character
#
# is a Graphical Character

C program to check whether a character is alphabet or digit using isalpha and isdigit function

We will use isdigit function to check whether character is a digit or not. If passed character is a decimal digit character, then isdigit function returns non-zero integer otherwise 0.

We will use isalpha function to check whether character is a alphabet or not. If passed character is an alphabet(a-z, A-Z), then isalpha function returns non-zero integer otherwise 0.

/*
 * C program to check whether a character is Alphabet or Digit 
 * or Other Graphical Character using isalpha and isdigit function
 */ 
   
#include <stdio.h>
#include <ctype.h>
   
int main() {  
    char character;
    /* 
     * Take a character as input from user 
     */
    printf("Enter a Character\n");  
    scanf("%c", &character);  
       
    if(isalpha(character)) {  
        printf("%c is an Alphabet\n", character);  
    } else if(isdigit(character)) {
        printf("%c is a Digit \n", character);  
    } else {
        printf("%c is a Graphical Character\n", character);  
    }
   
    return 0;  
}

Output

Enter a Character
T
T is an Alphabet

Enter a Character
1
1 is a Digit

Enter a Character
%
% is a Graphical Character

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