The **`wcscpy`** function in C copies a wide string to a specified location. `wcscpy` copies all characters prior to the null character.

The process is illustrated below:

>Note: A wide string is comprised of characters from the [Unicode](https://unicodebook.readthedocs.io/programming_languages.html) character set.

To use the `wcscpy` function, you will need to include the `<wchar.h>` library in the program, as shown below:

```C
#include <wchar.h>
```

The prototype of the `wcscpy` function is shown below:

```C
wchar_t *wcscpy(wchar_t *dest, wchar_t *src);
```

# Parameters

The `wcscpy` function takes the following two `wchar_t*` objects as parameters:
* `dest`: destination string
* `src`: null-terminated source string

# Return Value

The `wcscpy` function copies the `src` string to the `dest` string and returns a pointer to the altered `dest` string.

The behavior of the `wcscpy` function is undefined in the following cases:

* The memory allocated for the `dest` string is not large enough.
* The `src` and `dest` strings overlap.

# Example

The code below shows how the `wcscpy` function works in C:

#include <stdio.h>
#include <wchar.h>

int main() {

  // initializing strings
  wchar_t src[] = L"Learning wcscpy with Educative!";
  wchar_t dst[40];

  // copying string
  wcscpy(dst, src);

  // printing new dest string
  printf("%ls", dst);
  return 0;
}

# Explanation

First, two wide strings are declared for the source and destination addresses. The 'L' identifier in `line 7` informs the compiler that the Unicode character set is being used.

The `wcscpy` function proceeds to copy the source string to the destination address in `line 11`. The updated value of the string is output.


What is wcscpy in C?

The wcscpy function in C copies a wide string to a specified location, requiring <wchar.h> and handling null-terminated wide strings.