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C isgraph() function

C isgraph(int ch)

The isgraph() function is used to check whether a character is a graphic character or not. The function is defined in the ctype.h header file.

Note: In ISO/IEC 646 and related standards including ISO 8859 and Unicode, a graphic character is any character intended to be written, printed, or otherwise displayed in a form that can be read by humans. In other words, it is any encoded character that is associated with one or more glyphs

Syntax:

int isgraph(int argument);

isgraph() Parameters:

Name Description Required /Optional
ch ch is a character of class graph in the current locale. Required

Return value from isgraph()

  • The isgraph() function returns non-zero if ch is a character with a visible representation; otherwise, returns 0.

Example-1: Check graphic character


#include <stdio.h>
#include <ctype.h>
int main()
{
    char ch;
    ch = ' ';
    printf("\nIf %c is graph character or not? %d", ch, isgraph(ch));
    ch = '\n';
    printf("\nIf %c is graph character or not? %d", ch, isgraph(ch));
    ch = '5';
    printf("\nIf %c is graph character or not? %d", ch, isgraph(ch));
}

Output:

If   is graph character or not? 0
If
 is graph character or not? 0
If 5 is graph character or not? 4

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What's an object file in C?

An object file is the real output from the compilation phase. It's mostly machine code, but has info that allows a linker to see what symbols are in it as well as symbols it requires in order to work. (For reference, "symbols" are basically names of global objects, functions, etc.)

A linker takes all these object files and combines them to form one executable (assuming that it can, i.e.: that there aren't any duplicate or undefined symbols). A lot of compilers will do this for you (read: they run the linker on their own) if you don't tell them to "just compile" using command-line options. (-c is a common "just compile; don't link" option.)

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