std::strncpy 简介

std::strncpy

C++

Strings library

 

Defined in header <cstring>

 char *strncpy( char *dest, const char *src, std::size_t count );

If count is reached before the entire string src was copied, the resulting character array is not null-terminated.Copies at most count characters of the byte string pointed to by src (including the terminating null character) to character array pointed to by dest.

If, after copying the terminating null character from src, count is not reached, additional null characters are written todest until the total of count characters have been written.

If the strings overlap, the behavior is undefined.

Parameters

dest　　　 pointer to the character array to copy to

src　　　　pointer to the byte string to copy from

count　　  maximum number of characters to copy

Return value

dest

Example

#include <iostream>
#include <cstring>
using namespace std;

int main ()
{
  char str1[]= "To be or not to be";
  char str2[6];
  strncpy (str2,str1,5);
  str2[5]='\0';
  cout<<str2;
  return 0;
}

Output:

1  To be