strcpy 与 strncpy 区别

strcpy() 复制源文件的结尾符。
strncpy 不会复制
下面的代码显示区别

/*************************************************
 * example of strstr():
 * replace "simple " to "sample" *
 * *
 * *
 * *
 * ************************************************/


#include <string.h>
#include <stdio.h>


int main()
{
     char str[] = "This is a simple example! ";
     char *ptr;
     ptr = strstr( str, "simple" );
     //strcpy( ptr , "sample" );//wrong; strcpy() including the null terminate character: the result is "This is a simple"

     strncpy( ptr , "sample" , 6 );//right

     puts( str );
      return 0;
}

strncpy( ptr , "sample" , 6 );//right
才会显示正确的结果。而用strcpy()则不行1