大神帮忙看一下这个字符串复制的程序

veer786

#include<stdio.h>
void string_copy(char from[],char to[]);
void string_copy_pointer(char *from,char *to);
int main()
{
char a[] = "I love programing!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!";
char b[] = "I don't love programing!!!";
printf("复制之前a：%s\n",a);
printf("复制之前b：%s\n",b);
string_copy(a,b);
printf("复制之后a：%s\n",a);
printf("复制之后b：%s\n",b);
return 0;
}
void string_copy(char from[],char to[])
{
int i= 0;
while(from[i] != '\0')
{
  to[i] = from[i];
  i++;
}
to[i] = '\0';
}
void string_copy_pointer(char *from,char *to)
{
int i = 0;
while(*(from+i) != '\0')
{
  *(to + i) = *(from +i);
  i++;
}
*(to+i) = '\0';
}
为什么复制之后字符串啊的值成了：！！！！！！！！！
而不是先前的I love programing!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!";

风之残月

void string_copy(char from[],char to[])
{
        int i = 0;
        int j = strlen(to);
        while(from[i] != '\0')
        {
                to[j] = from[i];
                i++;
                j++;
        }
        to[j] = '\0';
}

复制的话应该将a接在b的末尾

jaqi

char b[] 和char a[] 长度不同，把a[]复制给b[]相当于对b进行了越界写入