第八周 C++实践 分支程序设计

/** Copyright (c) 2016,北京建筑大学测绘学院* All rights reserved.* 文件名称：第八周项目.cpp* 作    者：书写未来的code* 完成日期：2016 年 1 月 30 日* 版 本 号：v1.0** 标题：第8周项目*///第8周项目6：本月有几天？#include "stdafx.h"#include <iostream>using namespace std;int main(){bool leap = true;int year,month,day;cout << "请输入年份和月份：";cin >> year >> month;//判断是否为闰年if (year % 4 != 0){leap = false;}else if (year % 100 != 0){leap = true;}else if (year % 400 == 0){leap = true;}else{leap = false;}//判断所在月中某一个月有多少天switch (month){case 1:case 3:case 5:case 7:case 8:case 10:case 12:day = 31;break;case 2:if (leap){day = 29;}else{day = 28;}break;case 4:case 6:case 9:case 11:day = 30;default:break;}cout << year << "年中" << month << "月有" << day << "天。" << endl;return 0;}//第8周项目5：定期存款利息计算器#include "stdafx.h"#include <iostream>#include <cmath>using namespace std;int main(){double dSalary, interest, rate, date, sum;int k;cout << "欢迎使用利息计算器！" << endl;cout << "请输入存款金额：";cin >> dSalary;cout << "======存款期限======" << endl;cout << "1. 3个月\n2. 6个月\n3. 一年\n4. 二年\n5. 三年\n6. 五年\n";cout << "请输入存款期限的代号：";cin >> k;switch (k){case 1:date = 0.25; rate = 0.031; break;case 2:date = 0.5; rate = 0.033; break;case 3:date = 1; rate = 0.035; break;case 4:date = 2; rate = 0.044; break;case 5:date = 3; rate = 0.05; break;case 6:date = 5; rate = 0.055; break;default:break;}interest = dSalary*rate*date;sum = dSalary + interest;cout << "到期利息为" << interest << "元，" << "本息合计共" << sum << "元。" << endl;cout << "感谢您的使用，欢迎下次光临！" << endl;return 0;}//第8周项目4：个人所得税计算器#include "stdafx.h"#include <iostream>#include <cmath>using namespace std;int main(){double dSalary, dTax = 0, dNetIncome = 0;double rate;double delt,k;cout << "请输入您本月的收入总额（元）：";cin >> dSalary;// 下面求解应缴个人所得税dTax和税后收入dNetIncomedelt = dSalary - 3500;if (delt <= 1500){rate = 0.03; k = 0;}else if (delt <= 4500){rate = 0.1; k = 105;}else if (delt <= 9000){rate = 0.1; k = 105;}else if (delt <= 35000){rate = 0.25; k = 1005;}else if (delt <= 55000){rate = 0.3; k = 2755;} else if (delt <= 80000){rate = 0.35; k = 5505;}else{rate = 0.45;k = 5505;}dTax = (dSalary - 3500)*rate - k;dNetIncome = dSalary - dTax;cout << "您本月应缴个人所得税 " << dTax << " 元，税后收入是 " << dNetIncome << " 元。\n";cout << "依法纳税，共享繁荣。谢谢使用！\n" << endl;return 0;}//第8周项目3：多分段函数求值，请用if~else~语句的嵌套，实现这个多分支的程序；#include "stdafx.h"#include <iostream>#include <cmath>using namespace std;int main(){double x, y;cout << "Input x:";cin >> x;int t;t = (x < 2) + (x < 6) + (x < 10);switch (t){case 3:y = x;break;case 2:y = x*x + 1;break;case 1:y = sqrt(x + 1);break;case 0:y = 1 / (x + 1);break;default:break;}cout << "y = " << y << endl;return 0;}//第8周项目3：多分段函数求值，请用if~else~语句的嵌套，实现这个多分支的程序；#include "stdafx.h"#include <iostream>#include <cmath>using namespace std;int main(){double x, y;cout << "Input x:";cin >> x;if (x < 2){y = x;}else if (x >= 2 && x < 6){y = x*x + 1;}else if (x >= 6 && x < 10){y = sqrt(x + 1);}else{y = 1 / (x + 1);}cout << "y = " << y << endl;return 0;}//第8周项目2：加班费，要不要？#include "stdafx.h"#include <iostream>using namespace std;int main(){double rate, hour,salary;cout << "Input rate,hour:";cin >> rate >> hour;if (hour <= 40){salary = rate*hour;}else{salary = rate*1.5*(hour-40) + rate*40;}cout << "salary = " << salary << endl << endl;return 0;}//第8周项目1：求分段函数的值#include "stdafx.h"#include <iostream>using namespace std;int  main(){int x, y;cout << "请输入x的值：";cin >> x;if (x >= 1){y = x - 1;}else{y = 1 - x;}cout << "y = " << y << endl;return 0;}//阅读下面的两段程序，用“人脑”运行写出输出结果，再在计算机或手机上运行程序，对比自己写出的结果，进行反思。#include "stdafx.h"#include <iostream>using namespace std;int  main(){int a = 1, b = 2, c = 3;if (a <= c)if (b == c)cout << "a = " << a << endl;elsecout << "b = " << b << endl;cout << "c = " << c << endl;return 0;}#include "stdafx.h"#include <iostream>using namespace std;int main(){int i = 10, j, m = 0, n = 0;j = i % 3;switch (j){case 0: m++;break;case 1:case 2: n++;//这句执行完，n的值就会加1。break;default: cout << "i=" << i << endl;}cout << "m = " << m << ",n = " << n << endl;return 0;}