C Exercises: Check whether a character is an alphabet, digit or special character

Last update on March 18 2025 13:32:36 (UTC/GMT +8 hours)

16. Character Type Classification

Write a C program to check whether a character is an alphabet, digit or special character.

Visual Presentation:

Sample Solution:

C Code:

#include <stdio.h>  // Include the standard input/output header file.

int main()  
{  
    char sing_ch;  // Declare a variable to store a single character.

    printf("Input a character: ");  // Prompt user for input.  
    scanf('%c', & sing_ch);  // Read and store the character input.

    /* Checks whether it is an alphabet */  
    if((sing_ch>='a' && sing_ch<='z') || (sing_ch>='A' && sing_ch<='Z'))  
    {  
        printf("This is an alphabet.\n");  // Print message for alphabet.
    }  
    else if(sing_ch>='0' && sing_ch<='9') /* whether it is digit */  
    {  
        printf("This is a digit.\n");  // Print message for digit.
    }  
    else /* Else special character */  
    {  
        printf("This is a special character.\n");  // Print message for special character.
    }  
}

Output:

Input a character: @                                                                                          
This is a special character.

Flowchart:

For more Practice: Solve these Related Problems:

• Write a C program to determine if a given character is an alphabet, digit, or special character using ASCII ranges.
• Write a C program to classify a character without using built-in functions like isalpha() or isdigit().
• Write a C program to output the ASCII code of an input character along with its type.
• Write a C program to determine the character type and display a custom message for alphabets, digits, and special symbols.

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