C Program to Check Whether Character is Lowercase or Not

In this article we will show you, How to check whether the given character is a lowercase alphabet or not using islower built-in function and not using islower function.

C islower Function

In C Programming, islower is a built-in function present in the header file which is used to check whether the character is lowercase alphabet or not. The Syntax of the C islower function is

islower();

The C islower function will return an integer value as output.

• If the character inside the islower function is in lowercase then it will return non zero value
• If the character inside the C islower function is not in lowercase then it will return 0

C Program to Check Whether Character is Lowercase or Not using islower function

This C program allows the user to enter any character and check whether the character is lowercase alphabet or not

#include <stdio.h>
#include <ctype.h>

int main()
{
  char Ch;
 
  printf("\n Please Enter any alphabet\n");
  scanf("%c", &Ch);

  if ( islower(Ch) )
   {  
     printf ("\n Entered character is lowercase alphabet");
   }
  else
   {
     printf("\n Entered character is Not lowercase alphabet");
   }  
}

OUTPUT

ANALYSIS
In this C Program to Check Whether Character is Lowercase, we declared a character variable Ch. Below printf statement will asked to enter any character he like.

printf("\n Please Enter any character \n");

Below scanf statement will assign the user entered character to Ch variable

scanf("%c", &Ch);

In the next line we used the If Statement,

if (islower(Ch))

If the above condition is TRUE then the given character is a lowercase alphabet. So, it will print below statement

printf ("\n Entered character is lowercase alphabet");

If the above condition is FALSE then the given character is not lowercase alphabet So, it will print below statement

printf ("\n Entered character is Not lowercase alphabet");

C Program to Check Whether Character is Lowercase or Not without using islower function

This C program allows the user to enter any character and check whether the character is lowercase alphabet or not without using islower function.

#include <stdio.h>

int main()
{
  char Ch;

  printf("\n Please Enter any alphabet\n");
  scanf("%c", &Ch);

  if (Ch >= 'a' && Ch <= 'z')
   {  
     printf ( "\nEntered character is lowercase alphabet") ;
   }
  else
   {
     printf("\nEntered character is Not lowercase alphabet");
   }  
}

OUTPUT

Let us check with false value

ANALYSIS
Within this C Program to Check Whether Character is Lowercase or Not,  If you look at the If Statement

 if (Ch >= 'a' && Ch <= 'z')

As we all know that, all the lowercase characters are between a and z. So, the above if condition will check whether the given character is between a and z.

If the above condition is TRUE then the given character is a lowercase alphabet So, it will print below statement

printf ("\n Entered character is lowercase alphabet");

If the above condition is FALSE then the given character is not lowercase alphabet So, it will print below statement

printf ("\n Entered character is Not lowercase alphabet");

C Program to Check Whether Character is Lowercase or Not using ASCII Values

This C program allows the user to enter any character and check whether the character is lowercase alphabet or not without using islower function.

#include <stdio.h>

int main()
{
  char Ch;
  
  printf("\n Please Enter any character\n");
  scanf("%c", &Ch);

  if (Ch >= 97 && Ch <= 122)
   {  
     printf ( "\nEntered character is lowercase alphabet") ;
   }
  else
   {
     printf("\nEntered character is Not lowercase alphabet");
   }  
}

OUTPUT

ANALYSIS
In this c lowercase program, If you look at the If Statement

if (Ch >= 97 && Ch <= 122)

If the above condition is TRUE then the given character is a lowercase alphabet So, it will print below statement

printf ("\n Entered character is lowercase alphabet");

If the above condition is FALSE then the given character is not lowercase alphabet So, it will print below statement

printf ("\n Entered character is Not lowercase alphabet");

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