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