C Program to Check whether the entered character is capital, small letter, digit or special character2 min read

In this tutorial, we will write a program to check whether the entered character is capital, small letter, digit or any special character using C programming.

Here, we will write two different C program,

  1. user library function
  2. ASCII value of the character

1. Using library function

The following C program Check whether the entered character is capital, small letter, digit or special character by using the user library function provided by the ctype.h header file.

Following are some of the library functions in C:

  • isupper(): It returns true if the character is in uppercase.
  • islower(): It returns true if the character is in lowercase.
  • isdigit(): It returns true if entered character is a digit.
  • isalpha(): This function checks whether the passed character is alphabetic.
  • isspace(): This function checks whether the passed character is white-space.
    etc.

C Program:

Output:

//First Execution
Enter a Character: A
A is an Upper case character.

//Second Execution
Enter a Character: b
b is a Lower case character.

//Third Execution
Enter a Character: 7
7 is a Digit character.

//Fourth Execution
Enter a Character: @
@ is a Special character.


2. ASCII value of the character

The following C Program To Check For Alphabet, Number, and Special Symbol using the ASCII value.

The following table shows the range of ASCII values for various characters.

CharactersASCII Values
A – Z65 – 90
a – z97 – 122
0 – 948 – 57
special symbols0 – 47, 58 – 64, 91 – 96, 123 – 127

C Program:

Output:

//Run 1
Enter a Character: 7
7 is a Digit Character.

//Run 2
Enter a Character: A
A is an Upper case Character.


MORE

C Program to search an element in an array using Pointers

A separate function( search_function()) will be created where the array pointer will be declared and the searched element along with the size of an array …

C Program to find the sum of the digits of a number using recursion function

This C program calculates the sum of digits of a given number using recursion. Here’s a concise explanation: Function Definition: sumDigits(int n) This function calculates …

C program to find factorial of a number using Ternary operator with Recursion

Recursion refers to the function calling itself directly or in a cycle. Before we begin, you should have the knowledge of following in C Programming: …

C Program to Add Two Numbers Using Call by Reference

The program takes the two numbers from the user and passes the reference to the function where the sum is calculated. You may go through …

Find the output ab, cd, ef, g for the input a,b,c,d,e,f,g in Javascript and Python

In this tutorial, we will write a program to find a pairs of elements from an array such that for the input [a,b,c,d,e,f,g] we will …

String Pattern Programs in C

In this tutorial, we will write various C pattern programs for String. Before that, you may go through the following topics in C. for loop …