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。
语法:
wint_t btowc( int ch );
参数:该函数接受一个强制参数ch指定的单字节字符转换其到它的宽字符。
返回值:
如果ch是有效的单字节字符,则该函数返回ch的宽字符表示形式。如果ch是EOF ,则返回WEOF 。
下面的程序说明了上述函数。
程序1 :
// Program to illustrate
// btowc() function
#include
#include
#include
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
#include
#include
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
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