The **`strncpy()` function** is a built-in library function that is declared in the string.h header file. The function copies the source string to a destination string until a null character( **\0** ) is reached.

# Syntax
``` c++
char * strcpy (char * Dest, char * Src);
```
In C++, style strings (i.e., *string*) cannot be passed as a parameter in the `strncpy()` fucntion. The `string.c_str()` is used to convert the string to *char str[]*. 

// C++ program
#include <bits/stdc++.h> 

using namespace std; 

// driver code 
int main() 
{ 
	string str = "Educative"; 

	int size = str.length(); 
	char char_arr[size + 1]; 
  // copying 
	strcpy(char_arr, str.c_str()); 

	for (int i = 0; i < size; i++) 
		cout << char_arr[i]; 

	return 0; 
} 


How to copy a string using strncpy() in C++

Syntax

Implementation