字符串复制strncpy

 #include "stdafx.h"
  #include "iostream"
  #include "assert.h"

  using namespace std;

  char* mystrncpy(char* dest, const char* src, int n)
  {
      assert(dest!=NULL && src!=NULL);
     int count = ;
     while (*src != '\0')
     {
         if (count >= n)
         {
             break;
         }
         dest[count++] = *src++;
     }
     dest[count] = '\0';
     return dest;
 }

 int main(int argc, char* argv[])
 {
     printf("Hello World!\n");
     char buf[] = {};
     mystrncpy(buf, "FUCK!", );
     cout << buf << endl;
     return ;
 }

输出：

Hello World!

FUCK!

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