把字符串a复制到字符串b，利用指针（二）

int main(void)
{
    char a[] = "i am a boy", b[20], *p1, *p2;
    p1 = a;
    p2 = b;
    for (; *p1 != '\0'; p1++, p2++)
    {
        *p2 = *p1;
    }
    *p2 = '\0';
    printf(" string a is : %s\n", a);
    printf(" string b is : %s\n", b);

    return 0;