isgraph


function
<cctype> 
int isgraph ( int c );

Check if character has graphical representation

Checks if parameter c is a character with graphical representation. The characters with graphical representation are all those characters than can be printed (as determined by isprint) except for whitespace characters (like ' '), which are not considered isgraph characters.

For a detailed chart on what the different ctype functions return for each character of the standard ANSII character set, see the reference for the <cctype> header.

In C++, a locale-specific template version of this function (isgraph) exists in header <locale>.

Parameters

c
Character to be checked, casted to an int, or EOF.


Return Value

A value different from zero (i.e., true) if indeed c has a graphical representation as character. Zero (i.e., false) otherwise.

Example

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/* isgraph example */
#include <stdio.h>
#include <ctype.h>
int main ()
{
  FILE * pFile;
  int c;
  pFile=fopen ("myfile.txt","r");
  if (pFile)
  {
    do {
      c = fgetc (pFile);
      if (isgraph(c)) putchar (c);
    } while (c != EOF);
    fclose (pFile);
  }
 }


This example prints out the contents of "myfile.txt" without spaces and special characters, i.e. only prints out the characters that qualify as isgraph.

See also

isprint Check if character is printable (function)
isspace Check if character is a white-space (function)
isalnum Check if character is alphanumeric (function)