C library function - isprint()

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Description

The C library function int isprint(int c) check whether the passed character is printable.A printable character is a character that is not a control character.

Declaration

Following is the declaration for isprint() function.

int isprint(int c);

Parameters

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

Return Value

This function returns a non zero value(true) if c is a printable character else, zero (false)

Example

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

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

int main()
{
   int var1 = 'k';
   int var2 = '8';
   int var3 = '\t';
   int var4 = ' ';
    
   if( isprint(var1) )
   {
      printf("var1 = |%c| can be printed\n", var1 );
   }
   else
   {
      printf("var1 = |%c| can't be printed\n", var1 );
   }
   if( isprint(var2) )
   {
      printf("var2 = |%c| can be printed\n", var2 );
   }
   else
   {
      printf("var2 = |%c| can't be printed\n", var2 );
   }
   if( isprint(var3) )
   {
      printf("var3 = |%c| can be printed\n", var3 );
   }
   else
   {
      printf("var3 = |%c| can't be printed\n", var3 );
   }
   if( isprint(var4) )
   {
      printf("var4 = |%c| can be printed\n", var4 );
   }
   else
   {
      printf("var4 = |%c| can't be printed\n", var4 );
   }
   
   return(0);
}   

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

var1 = |k| can be printed
var2 = |8| can be printed
var3 = |	| can't be printed
var4 = | | can be printed


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