isprint

int isprint( int ch );

Checks if the given character can be printed, i.e. it is either a number (0123456789), an uppercase letter (ABCDEFGHIJKLMNOPQRSTUVWXYZ), a lowercase letter (abcdefghijklmnopqrstuvwxyz), a punctuation character(!"#$%&'()*+,-./:;<=>?@[\]^_`{|}~), or space, or any character classified as printable by the current C locale.

The behavior is undefined if the value of ch is not representable as unsigned char and is not equal to EOF.

Parameters

Return value

Non-zero value if the character can be printed, zero otherwise.

Example

#include <stdio.h>
#include <ctype.h>
#include <locale.h>
 
int main(void)
{
    unsigned char c = '\xa0'; // the non-breaking space in ISO-8859-1
    printf("In the default C locale, \\xa0 is %sprintable\n", isprint(c)?"":"not ");
    setlocale(LC_ALL, "en_GB.iso88591");
    printf("In ISO-8859-1 locale, \\xa0 is %sprintable\n", isprint(c)?"":"not ");
}

In the default C locale, \xa0 is not printable
In ISO-8859-1 locale, \xa0 is printable

References

• C11 standard (ISO/IEC 9899:2011):
  • 7.4.1.8 The isprint function (p: 202)
• C99 standard (ISO/IEC 9899:1999):
  • 7.4.1.8 The isprint function (p: 183)
• C89/C90 standard (ISO/IEC 9899:1990):
  • 4.3.1.7 The isprint function

See also