[C++知识库]strncpy 跟 memcpy 的区别

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strncpy 跟 memcpy 的区别：

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strncpy 具有 置 0特性

#include<stdio.h>
#include<stdlib.h>
#include <string.h>
int main()
{
  char *a="abcdefg"; //len = 7
  char b[10] = {'1','1','0','1','1','1','1','1','1','1'};
  char c[10] = {'1','1','0','1','1','1','1','1','1','1'};
  char d[10] = {'1','1','0','1','1','1','1','1','1','1'};
  char e[11] = {'1','1','0','1','1','1','1','1','1','1','1'};
  strncpy(b,a,6);
  strncpy(c,a,7);
  strncpy(e,a,10);
  printf("b is %s\n",b);
  printf("c is %s\n",c);
  printf("e is %s\n",e);
  printf("e[9] = %d\n",e[9]);
  printf("e[10] = %d\n",e[10]);
}

输出结果

b is abcdef1111
c is abcdefg111@
e is abcdefg
e[9] = 0
e[10] = 49

可以看出 a[8] a[9] 被置为 0

参考：
【C代码】strncpy与memcpy区别