用指针实现strcpy功能

 1 #include <stdio.h>
 2 int main(int argc, const char *argv[])
 3 {
 4     char a[45]="hello word";
 5     char b[45]="xjwkkk";
 6     char *p1=a;
 7     char *p2=b;
 8     while(*p2)
 9     {
10         *p1=*p2;
11         p1++;
12         p2++;
13     }
14     printf("%s\n%s\n",a,b);
15 
16     return 0;
17 }