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std:: strcpy

From cppreference.net
C++
Text processing library
Null-terminated byte strings
Defined in header <cstring>
char * strcpy ( char * dest, const char * src ) ;

Copies the character string pointed to by src , including the null terminator, to the character array whose first element is pointed to by dest .

The behavior is undefined if the dest array is not large enough. The behavior is undefined if the strings overlap.

Contents

Parameters

dest - pointer to the character array to write to
src - pointer to the null-terminated byte string to copy from

Return value

dest

Example

Run this code 
#include <cstring>
#include <iostream>
#include <memory>
int main()
{
    const char* src = "Take the test.";
//  src[0] = 'M'; // can't modify string literal
    auto dst = std::make_unique<char[]>(std::strlen(src) + 1); // +1 for null terminator
    std::strcpy(dst.get(), src);
    dst[0] = 'M';
    std::cout << src << '\n' << dst.get() << '\n';
}

Output: 

Take the test.
Make the test.

See also

copies a certain amount of characters from one string to another
(function)
copies one buffer to another
(function)
C documentation for strcpy