算价格01

题目：

输入购买图书的数量，根据购买图书的数量，有不同的优惠，计算出购买这些数量的图书需要花多少钱？

设计思想：

    定义变量number为购买的图书数量，将number除以10取余数，用switch语句根据余数选择10以内的图书的价格price_part，再根据（number-yushu）/ 10 + price_part 计算总价格。

程序源代码如下：

#include<iostream>
#include <windows.h>
using namespace std;

void main()
{
    int number=0;
    double price=0;              //总的图书最低价格
    double price_part=0;     //当图书数目除以10后，余数数量的图书所需要的价格
    int yushu=0;   

    SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE),FOREGROUND_INTENSITY |FOREGROUND_RED);
    //这句话是设置字体颜色红色
    cout<<"$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$"<<endl;
    cout<<endl;
    SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE),FOREGROUND_INTENSITY |FOREGROUND_GREEN);
   //这句话是设置字体颜色绿色
    cout <<"Please input the number of book：";
    cin>>number;
    cout<<endl;
    SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE),FOREGROUND_INTENSITY |FOREGROUND_RED);
    cout<<"$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$"<<endl;
    yushu=number%10;

    switch(yushu)
    {
    case 0:
        price_part=0;
        break;
    case 1:
        price_part=8;
        break;
    case 2:
        price_part=15.2;
        break;
    case 3:
        price_part=21.6;
        break;
    case 4:
        price_part=25.6;
        break;
    case 5:
        price_part=30;
        break;
    case 6:
        price_part=43.2;
        break;
    case 7:
        price_part=47.2;
        break;
    case 8:
        price_part=51.2;
        break;
    case 9:
        price_part=55.6;
        break;
    }
    cout<<endl;
    SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE),FOREGROUND_INTENSITY |FOREGROUND_BLUE);
    cout<<"$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$"<<endl;

    price=  ( number - yushu ) / 10 * 60 + price_part;

    cout<<endl;
    SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE),FOREGROUND_INTENSITY |FOREGROUND_GREEN);

    cout<<"买"<<number<<"本书的最低价格是 :"<<price<<" !"<<endl;

    cout<<endl;
    SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE),FOREGROUND_INTENSITY |FOREGROUND_BLUE);
    cout<<"$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$"<<endl;
    cout<<endl;
    SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE),FOREGROUND_INTENSITY |FOREGROUND_RED | FOREGROUND_GREEN | FOREGROUND_BLUE);
    //又把字体换成白色
}

运行结果：

个人总结：

今天的算法经过老师的提示实现起来比较简单，因此百度了一下怎么改变字体的颜色。做了最简单的加工。