isprint function(Test for Printing Character) in C Language – example and detail

In the C Programming Language, the isprint feature checks whether c is a printing character and it does include a space. If you do not want to include a space, attempt the use of the isgraph function.


The syntax for the isprint feature in the C Language is:

int isprint(int c);

Parameters or Arguments

c The price to test whether it is a printing personality and it does encompass a space.


The isprint feature returns a nonzero fee if c is a printing persona and returns zero if c is now not a printing character.

Required Header

In the C Language, the required header for the isprint function is:

#include <ctype.h>

Applies To

In the C Language, the isprint feature can be used in the following versions:

ANSI/ISO 9899-1990

isprint Example

/* Example using isprint by */

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

int main(int argc, const char * argv[])
    /* Define a temporary variable */
    unsigned char test;

    /* Assign a test printable letter to the variable */
    test = 'T';

    /* Test to see if this character is a printing character */
    if (isprint(test) != 0) printf("%c is a printing character\n", test);
    else printf("%c is not a printing character\n", test);

    /* Assign a non-printing character to the variable */
    test = 0; /* This is NUL */

    /* Test to see if this character is a printing character */
    if (isprint(test) != 0) printf("NUL is a printing character\n");
    else printf("NUL is not a printing character\n");

    return 0;

When compiled and run, this application will output:

T is a printing character
NUL is not a printing character

Similar Functions

Other C features that are comparable to the isprint function:

iscntrl function isgraph feature isspace characteristic