3.5 3.7怎么做用c++语言

Question

3.5 3.7初学c++ 怎么做啊 好难啊 帮帮我 不知道怎么办 好难啊 有没有

Answer 1

3.5代码如下

#include <iostream>
using namespace std;

int main()
{
    int today, elapsed;//定义变量类型
    cout << "Please enter an integer representing the day of the week today" << endl;
    cout << "For example,Monday is 1.In particular,Sunday is 0." << endl;
    cout << "Enter today's day : ";//今天周几
    cin >> today;
    cout << "Enter the number of days elapsed since today : ";//距离今天有几天
    cin >> elapsed;

    int day;
    day = (today + elapsed) % 7;//判断未来是周几

    switch (today)//用分支语句判断今天周几
    {
    case 0: cout << "Today is Sunday" << endl;
        break;
    case 1: cout << "Today is Monday" << endl;
        break;
    case 2: cout << "Today is Tuesday" << endl;
        break;
    case 3: cout << "Today is Wednesday" << endl;
        break;
    case 4: cout << "Today is Thursday" << endl;
        break;
    case 5: cout << "Today is Friday" << endl;
        break;
    case 6: cout << "Today is Saturday" << endl;
        break;
    }

    switch (day)//用分支语句判断未来周几
    {
    case 0: cout << "The future day is Sunday" << endl;
        break;
    case 1: cout << "The future day is Monday" << endl;
        break;
    case 2: cout << "The future day is Tuesday" << endl;
        break;
    case 3: cout << "The future day is Wednesday" << endl;
        break;
    case 4: cout << "The future day is Thursday" << endl;
        break;
    case 5: cout << "The future day is Friday" << endl;
        break;
    case 6: cout << "The future day is Saturday" << endl;
        break;
    }

    system("pause");

    return 0;
}

运行结果如下图

3.7代码如下

#include<stdio.h>
void swap(int* pt1, int* pt2)  //交换指针指向值
{
    int temp;
    temp = *pt1;
    *pt1 = *pt2;
    *pt2 = temp;
}
void exchange(int* p1, int* p2, int* p3)
{
    if (*p1 > *p2)         //如果p1指针指向的数大于p2,则交换指针指向值
        swap(p1, p2);
    if (*p1 > *p3)          //同上
        swap(p1, p3);
    if (*p2 > *p3)         //同上
        swap(p2, p3);

}

int main()
{
    int a, b, c;                  //定义三个变量
    int* p1, * p2, * p3;       //定义三个指针
    printf("请输入3个整数，整数之间用空格隔开: \n");
    scanf("%d %d %d", &a, &b, &c);    //输入三个数值
    p1 = &a, p2 = &b, p3 = &c;        //把a,b,c三个数的地址赋值给对应指针
    exchange(p1, p2, p3);         //调用函数
    printf("%d,%d,%d\n", a, b, c); //将调换后的值顺序输出
    int wait = 1;
    scanf("%d", &a);
    return 0;
}

运行截图如下图