C++ btowc()用法及代码示例

btowc()是C /C++中的内置函数，可将字符转换为等效的宽字符。它在C++的cwchar头文件中定义。

用法：

wint_t btowc( int ch );

参数：该函数接受一个强制性参数ch，该参数指定要转换为宽字符的单字节字符。

返回值：
如果ch是有效的单字节字符，则该函数返回ch的宽字符表示。如果ch为EOF，则返回WEOF。

以下示例程序旨在说明上述函数。

程序1:：

// Program to illustrate 
// btowc() function 
#include <cstring> 
#include <cwchar> 
#include <iostream> 
using namespace std; 
  
int main() 
{ 
    char str[] = "Geeksfor\xf4\xdgeeks"; 
    wchar_t wc; 
    int count = 0; 
  
    for (int i = 0; i < strlen(str); i++) { 
  
        wc = btowc(str[i]); 
        if (wc != WEOF) 
            count++; 
    } 
  
    cout << count << " out of " << strlen(str) 
         << " Characters were successfully widened"; 
    return 0; 
}

输出：

14 out of 15 Characters were successfully widened

程序2:：

// Program to illustrate 
// btowc() function 
#include <cstring> 
#include <cwchar> 
#include <iostream> 
using namespace std; 
  
int main() 
{ 
    char str[] = "Ishwar\xa1\xcGupta"; 
    wchar_t wc; 
    int count = 0; 
  
    for (int i = 0; i < strlen(str); i++) { 
  
        wc = btowc(str[i]); 
        if (wc != WEOF) 
            count++; 
    } 
  
    cout << count << " out of " << strlen(str) 
         << " Characters were successfully widened"; 
    return 0; 
}

输出：

12 out of 13 Characters were successfully widened

相关用法

注：本文由纯净天空筛选整理自IshwarGupta大神的英文原创作品 btowc() function in C/C++ with Examples。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。