C library function - isupper()

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Description

The C library function int isupper(int c) check whether the passed character is uppercase letter.

Declaration

Following is the declaration for isupper() function.

int isupper(int c);

Parameters

  • c -- This is the character to be checked.

Return Value

This function returns a non zero value(true) if c is uppercase alphabetic letter else, zero (false)

Example

The following example shows the usage of isupper() function.

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

int main()
{
   int var1 = 'M';
   int var2 = 'm';
   int var3 = '3';
    
   if( isupper(var1) )
   {
      printf("var1 = |%c| is uppercase character\n", var1 );
   }
   else
   {
      printf("var1 = |%c| is not uppercase character\n", var1 );
   }
   if( isupper(var2) )
   {
      printf("var2 = |%c| is uppercase character\n", var2 );
   }
   else
   {
      printf("var2 = |%c| is not uppercase character\n", var2 );
   }   
   if( isupper(var3) )
   {
      printf("var3 = |%c| is uppercase character\n", var3 );
   }
   else
   {
      printf("var3 = |%c| is not uppercase character\n", var3 );
   }
   
   return(0);
}

Let us compile and run the above program, this will produce the following result:

var1 = |M| is uppercase character
var2 = |m| is not uppercase character
var3 = |3| is not uppercase character


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