C / C++中的wctrans()在头文件cwctype.h中指定,并返回与转换相对应的wctrans_t类型的值。特定的语言环境可以接受字符的多种转换。以下是一些公认的转换:
- “ tolower” ->小写| wl
- “ toupper” ->转换为大写字母|拖曳
句法:
wctrans_t wctrans( const char* string )
参数:该函数接受一个强制性参数字符串,该字符串指定标识字符转换的字符串。
返回值:函数返回两个值,如下所示:
- 如果当前语言环境不提供映射,则它返回零。
- 否则,它返回可与towctrans()一起用于映射宽字符。
下面的程序说明了上述函数:
程序1:
CPP
// C++ program to illustrate
// towctrans() function
#include
using namespace std;
int main()
{
// initialize the string
wchar_t string[] = L"GeeksForGeeks";
wcout << L"Initial string -> " << string << endl;
wctype_t first = wctype("lower");
wctype_t second = wctype("upper");
// traverse each character and convert
// lower case to upper and upper to lower
for (int i = 0; i < wcslen(string); i++) {
if (iswctype(string[i], first))
string[i] = towctrans(string[i], wctrans("toupper"));
else if (iswctype(string[i], second))
string[i] = towctrans(string[i], wctrans("tolower"));
}
// print the string after transformation
wcout << L"After transformation -> " << string << endl;
return 0;
}
CPP
// C++ program to illustrate
// towctrans() function
#include
using namespace std;
int main()
{
// initialize the string
wchar_t string[] = L"gfg";
wcout << L"Initial string -> " << string << endl;
wctype_t first = wctype("lower");
wctype_t second = wctype("upper");
// traverse each character and convert
// lower case to upper and upper to lower
for (int i = 0; i < wcslen(string); i++) {
if (iswctype(string[i], first))
string[i] = towctrans(string[i], wctrans("toupper"));
else if (iswctype(string[i], second))
string[i] = towctrans(string[i], wctrans("tolower"));
}
// print the string after transformation
wcout << L"After transformation -> " << string << endl;
return 0;
}
输出:
Initial string -> GeeksForGeeks
After transformation -> gEEKSfORgEEKS
程序2:
CPP
// C++ program to illustrate
// towctrans() function
#include
using namespace std;
int main()
{
// initialize the string
wchar_t string[] = L"gfg";
wcout << L"Initial string -> " << string << endl;
wctype_t first = wctype("lower");
wctype_t second = wctype("upper");
// traverse each character and convert
// lower case to upper and upper to lower
for (int i = 0; i < wcslen(string); i++) {
if (iswctype(string[i], first))
string[i] = towctrans(string[i], wctrans("toupper"));
else if (iswctype(string[i], second))
string[i] = towctrans(string[i], wctrans("tolower"));
}
// print the string after transformation
wcout << L"After transformation -> " << string << endl;
return 0;
}
输出:
Initial string -> gfg
After transformation -> GFG
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