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wmemcpy() function in C/C++

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The wmemcpy() function is specified in header file cwchar.h and copies a specified number of character from one string to the other. This function doesn’t check for any terminating null wide character in the first string called source it always copies exactly n characters to the second string called destination

Syntax:  

wchar_t* wmemcpy( wchar_t* destination, const wchar_t* source, size_t n )

Parameter: The function accepts three mandatory parameters which are described below:  

  • destination: specifies a pointer where the characters are to be copied.
  • source: specifies a pointer where the data are present.
  • n: specifies the number of characters to be copied.

Return value: The function returns the destination string.

Below programs illustrate the above function: 

Program 1 :  

C++




// C++ program to illustrate
// wmemcpy() function
 
#include <bits/stdc++.h>
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;
}


Output: 

Initial string -> geeks are for geeks
Final string -> geeks are for

 

Program 2 : 

C++




// C++ program to illustrate
// wmemcpy() function
// when 'n' is equal to the number of
// characters in the source string
#include <bits/stdc++.h>
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;
}


Output: 

Initial string -> GFG
Final string -> GFG

 



Last Updated : 05 Feb, 2021
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