6-1 交换两个整数的值

void fun(int* a, int* b)
{int* tmp = *a;*a = *b;*b = tmp;
}

6-2 利用指针找最大值

void findmax(int* px, int* py, int* pmax)
{*pmax = *px > *py ? *px : *py;
}

6-3 字符串的连接

char* str_cat(char* s, char* t)
{strcat(s, t);return s;
}

6-4 移动字母

void Shift(char s[])
{char ch[3];int count = 0;for (int i = 0; i < 3; i++)//存储前三个字符{ch[i] = s[i];}for (int i = 0; i < strlen(s) - 3; i++)//将后面的字符往前挪动覆盖{s[i] = s[i+3];count++;}for (int i = count,j=0; i < MAXS,j<3; i++,j++)//将存储的前三个字符存储到s数组的后面{s[i] = ch[j];}
}