C library functions -isgraph()
C Standard Library - <ctype.h>
Description
C Library Functionsint isgraph(int c)Checks whether the passed character has a graphical representation.
Characters with graphical representation are all printable characters except whitespace characters (such as ' ').
Declaration
Below is the declaration of the isgraph() function.
int isgraph(int c);
Parameter
- c-- This is the character to be checked.
Return Value
If c has a graphical representation, the function returns a non-zero value; otherwise, it returns 0.
Example
The following example demonstrates the usage of the isgraph() function.
Example
#include <stdio.h>
#include <ctype.h>
int main()
{
int var1 = '3';
int var2 = 'm';
int var3 = ' ';
if( isgraph(var1) )
{
printf("var1 = |%c| is printable\n", var1 );
}
else
{
printf("var1 = |%c| is not printable\n", var1 );
}
if( isgraph(var2) )
{
printf("var2 = |%c| is printable\n", var2 );
}
else
{
printf("var2 = |%c| is not printable\n", var2 );
}
if( isgraph(var3) )
{
printf("var3 = |%c| is printable\n", var3 );
}
else
{
printf("var3 = |%c| is not printable\n", var3 );
}
return(0);
}
Let us compile and run the above program, which will produce the following result:
var1 = |3| 是可打印的 var2 = |m| 是可打印的 var3 = | | 是不可打印的
The following example prints all graphic characters:
Example
#include <stdio.h>
#include <ctype.h>
int main()
{
int i;
printf("All graphical characters in C:\n");
for (i=0;i<=127;++i)
{
if (isgraph(i)!=0)
printf("%c ",i);
}
return 0;
}
Let us compile and run the above program, which will produce the following result:
C 语言中所有图形字符:
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 7 8 9 : ; < = > ? @ A B C D E F G H I J K L M N O P Q R S T U V W X Y Z [ \ ] ^ _ ` a b c d e f g h i j k l m n o p q r s t u v w x y z { | } ~
other extensions