C庫函數 int ispunct(int c) 檢查傳遞的字符是否是標點符號品格的標點符號是任何圖形字符（如isgraph）這是不是字母，數字（isalnum），。

聲明

以下是ispunct（）函數的聲明。

int ispunct(int c);

參數

• c -- 這是要檢查的字符。

返回值

這個函數如果c是一個標點符號一樣返回一個非零值（true），否則返回零（false）

例子

下麵的例子顯示ispunct（）函數的用法。

#include <stdio.h>
#include <ctype.h>

int main()
{
   int var1 = 't';
   int var2 = '1';
   int var3 = '/';
   int var4 = ' ';

   if( ispunct(var1) )
   {
       printf("var1 = |%c| is a punctuation character
", var1 );
   }
   else
   {
       printf("var1 = |%c| is not a punctuation character
", var1 );
   }
   if( ispunct(var2) )
   {
       printf("var2 = |%c| is a punctuation character
", var2 );
   }
   else
   {
       printf("var2 = |%c| is not a punctuation character
", var2 );
   }
   if( ispunct(var3) )
   {
       printf("var3 = |%c| is a punctuation character
", var3 );
   }
   else
   {
       printf("var3 = |%c| is not a punctuation character
", var3 );
   }
   if( ispunct(var4) )
   {
       printf("var4 = |%c| is a punctuation character
", var4 );
   }
   else
   {
       printf("var4 = |%c| is not a punctuation character
", var4 );
   }
   
   return(0);
}   

讓我們編譯和運行上麵的程序，這將產生以下結果：

var1 = |t| is not a punctuation character
var2 = |1| is not a punctuation character
var3 = |/| is a punctuation character
var4 = | | is not a punctuation character