wmemcpy()函数在头文件cwchar.h中指定,并将指定数量的字符从一个字符串复制到另一个字符串。这个函数不会在第一个叫做source的字符串检查任何终止的空宽字符,它总是将精确的n个字符复制到第二个叫做destination的字符串。
句法:
wchar_t* wmemcpy( wchar_t* destination, const wchar_t* source, size_t n )
参数:该函数接受三个强制性参数,如下所述:
- destination:指定要在其中复制字符的指针。
- source:指定数据存在的指针。
- n:指定要复制的字符数。
返回值:该函数返回目标字符串。
下面的程序说明了上述函数:
程序1:
C++
// C++ program to illustrate
// wmemcpy() function
#include
using namespace std;
int main()
{
// initialize the destination size
wchar_t destination[20];
// initialize the source string
wchar_t source[] = L"geeks are for geeks";
// till number of characters
int n = 13;
// function to copy from source to
// destination
wmemcpy(destination, source, n);
wcout << L"Initial string -> " << source << "\n";
// print the copied string
wcout << L"Final string -> ";
for (int i = 0; i < n; i++)
putwchar(destination[i]);
return 0;
}
C++
// C++ program to illustrate
// wmemcpy() function
// when 'n' is equal to the number of
// characters in the source string
#include
using namespace std;
int main()
{
// initialize the destination size
wchar_t destination[3];
// initialize the source string
wchar_t source[] = L"GFG";
// till number of characters
int n = 3;
// function to copy from source to
// destination
wmemcpy(destination, source, n);
wcout << L"Initial string -> " << source << "\n";
// print the copied string
wcout << L"Final string -> ";
for (int i = 0; i < n; i++)
putwchar(destination[i]);
return 0;
}
输出:
Initial string -> geeks are for geeks
Final string -> geeks are for
程序2:
C++
// C++ program to illustrate
// wmemcpy() function
// when 'n' is equal to the number of
// characters in the source string
#include
using namespace std;
int main()
{
// initialize the destination size
wchar_t destination[3];
// initialize the source string
wchar_t source[] = L"GFG";
// till number of characters
int n = 3;
// function to copy from source to
// destination
wmemcpy(destination, source, n);
wcout << L"Initial string -> " << source << "\n";
// print the copied string
wcout << L"Final string -> ";
for (int i = 0; i < n; i++)
putwchar(destination[i]);
return 0;
}
输出:
Initial string -> GFG
Final string -> GFG
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