C / C++中的iswgraph()及其示例

iswgraph()是C / C++中的内置函数，用于检查给定的宽字符是否具有图形表示。它在C++的cwctype头文件中定义。默认情况下，以下字符是图形：

• 数字(0到9)
• 大写字母(A到Z)
• 小写字母(a到z)
• 字符(！”＃$％＆’()* +，-./:;?@[\]^_`{|}~)

语法：

int iswgraph(ch)

参数：该函数接受一个强制性参数ch ，该参数指定宽字符，我们必须检查该宽字符是否具有图形表示形式。

返回值：该函数返回两个值，如下所示。

• 如果ch具有图形表示字符，则返回非零值。
• 如果不是图形表示字符，则返回0。

下面的程序说明了上述函数。

程序1 ：

// C++ program to illustrate
// iswgraph() function
#include 
#include 
using namespace std;
  
int main()
{
  
    wchar_t ch1 = '?';
    wchar_t ch2 = ' ';
  
    // Function to check if the character
    // has a graphical representation or not
    if (iswgraph(ch1))
        wcout << ch1 << " has graphical representation ";
    else
        wcout << ch1 << " does not have graphical representation ";
    wcout << endl;
  
    if (iswgraph(ch2))
        wcout << ch2 << " has graphical representation ";
    else
        wcout << ch2 << " does not have graphical representation ";
  
    return 0;
}

输出：

? has graphical representation 
  does not have graphical representation

程序2 ：

// C++ program to illustrate
// iswgraph() function
#include 
#include 
using namespace std;
  
int main()
{
  
    wchar_t ch1 = ' ';
    wchar_t ch2 = '3';
  
    // Function to check if the character
    // has a graphical representation or not
    if (iswgraph(ch1))
        wcout << ch1 << " has graphical representation ";
    else
        wcout << ch1 << " does not have graphical representation ";
    wcout << endl;
  
    if (iswgraph(ch2))
        wcout << ch2 << " has graphical representation ";
    else
        wcout << ch2 << " does not have graphical representation ";
  
    return 0;
}

输出：

does not have graphical representation 
3 has graphical representation

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