isgraph()C库函数

C库函数isgraph()检查字符是否为图形字符。
具有图形表示是公知的字符图形的字符。例如： ‘：’ ‘;’ ‘?’ ‘@’ 等等。

句法 –

#include 
int isgraph(int ch);

返回值–如果ch是除空格以外的任何可打印字符，则函数返回非零值，否则返回0。

对于ASCII环境，可打印字符的范围是0X21到0X7E 。

代码 –

// code to check graphical character
#include 
#include 
  
int main()
{
    char var1 = 'g';
    char var2 = ' ';
    char var3 = '1';
  
    if (isgraph(var1)) 
        printf("var1 = |%c| can be printed\n", var1);
    else 
        printf("var1 = |%c| can't be printed\n", var1);
  
    if (isgraph(var2)) 
        printf("var2 = |%c| can be printed\n", var2);
    else 
        printf("var2 = |%c| can't be printed\n", var2);
      
    if (isgraph(var3)) 
        printf("var3 = |%c| can be printed\n", var3);
    else 
        printf("var3 = |%c| can't be printed\n", var3);
  
    return (0);
}

输出 –

var1 = |g| can be printed
var2 = | | can't be printed
var3 = |1| can be printed

代码 –

// code to print all Graphical Characters
#include 
#include 
  
int main()
{ 
    int i;
    printf("In C programming All graphic "
            "characters are: \n");
  
    for (i = 0; i <= 127; ++i) 
        if (isgraph(i) != 0)
            printf("%c ", i);    
  
    return 0;
}

输出 –

In C programming All graphic characters are: 
! " # $ % & ' ( ) * +, - . / 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 { | } ~ 

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