The **`wmemcpy` function** is defined in the `<wchar.h>` header file in C. It is used to copy a given number of characters from one string to another. It takes in three parameters: a `source string`, `destination string`, and `number of characters` to copy. It then returns the destination string.

The illustration below shows how `wmemcpy` function works: 

# Declaration

The `wmemcpy` function is defined as following:

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

It returns the `destination` string.

# Parameter and return type

`wchar_t` stands for wide character. It is similar to `char` except `char` assigns one byte to each character, whereas `wchar_t` assigns two bytes. The `source` is of type `const wchar_t` since it is initialized beforehand. The `*` refers to a pointer to an array.

The return type is `wchar_t*`, which is the same as `destination`.

# Example

The following code snippet shows how we can use the `wmemcpy` function:

> In `Line 6`, the `L` preceding the string denotes `long`. Thus, it is used to indicate `wmemcpy` that a complete string is to be stored instead of a single character.


#include <stdio.h> // include header for putwchar
#include <wchar.h> // include header for wmemcpy
 
int main(){
    
    wchar_t source[] = L"EDUCATIVE"; // initialize source string
    wchar_t destination[6]; // initialize destination string
    int num = 6; // number of characters to copy
    
    wmemcpy(destination, source, num);
    
    for (int i = 0; i < num; i++)
        putwchar(destination[i]); // display characters on the screen
    return 0;
}


What is wmemcpy in C?

The wmemcpy function in <wchar.h> copies a specified number of wide characters from a source string to a destination string.