更高更高要求的四则运算
一、程序要求
1、学生写的程序必须能够判定用户的输入答案是否正确；
2、程序必须能处理四种运算的混合算式；
3、在上次程序的基础上，添加新的功能；
二、程序设计思想
1、在上次程序的基础之上添加要求；
2、判断答案正误时，整数比分数容易判断（判断过程不予叙述），所以单独引入分数类，设计函数分别计算分数四则运算的结果并与输入的结果比较判断；
三、源程序
//李俏，张莹荧，2016.3.15
//随机生成四则运算3
#include<iostream>
#include<stdio.h>
#include<stdlib.h>
#include<time.h>
using namespace std;
class Fenshu
{
private:
int fenzi; // 分子
int fenmu; // 分母
public:
Fenshu(int fz = 0, int fm = 1) :fenzi(fz), fenmu(fm){}
void set(int,int);
void simplify();
friend bool judge1(const Fenshu &c1, const Fenshu &c2); //判断两个分数是否相等
friend bool judge2(const Fenshu &c1, int z); //判断两个分数是否相等
friend Fenshu add(const Fenshu &c1, const Fenshu &c2); //两个分数相加，结果要化简
friend Fenshu sub(const Fenshu &c1, const Fenshu &c2); //两个分数相减，结果要化简
friend Fenshu mul(const Fenshu &c1, const Fenshu &c2); //两个分数相乘，结果要化简
friend Fenshu div(const Fenshu &c1, const Fenshu &c2); //两个分数相除，结果要化简
};
void Fenshu::set(int m, int n)// 分数赋值
{
fenzi = m;
fenmu = n;
}
void Fenshu::simplify()// 分数化简
{
int m, n, r;
m = abs(fenmu);
n = abs(fenzi);
while (r = m%n) // 求m，n的最大公约数
{
m = n;
n = r;
}
fenmu /= n; // 化简
fenzi /= n;
if (fenmu<0) // 将分母转化为正数
{
fenmu = -fenmu;
fenzi = -fenzi;
}
}
Fenshu add(const Fenshu &c1, const Fenshu &c2)// 分数相加
{
Fenshu t;
t.fenzi = c1.fenzi*c2.fenmu + c2.fenzi*c1.fenmu;
t.fenmu = c1.fenmu*c2.fenmu;
t.simplify();
return t;
}
Fenshu sub(const Fenshu &c1, const Fenshu &c2)// 分数相减
{
Fenshu t;
t.fenzi = c1.fenzi*c2.fenmu - c2.fenzi*c1.fenmu;
t.fenmu = c1.fenmu*c2.fenmu;
t.simplify();
return t;
}
Fenshu mul(const Fenshu &c1, const Fenshu &c2)// 分数相乘
{
Fenshu t;
t.fenzi = c1.fenzi*c2.fenzi;
t.fenmu = c1.fenmu*c2.fenmu;
t.simplify();
return t;
}
Fenshu div(const Fenshu &c1, const Fenshu &c2)// 分数相除
{
Fenshu t;
if (!c2.fenzi) return c1;
t.fenzi = c1.fenzi*c2.fenmu;
t.fenmu = c1.fenmu*c2.fenzi;
t.simplify();
return t;
}
bool judge1(const Fenshu &c1, const Fenshu &c2)//判断正误
{
bool flag;
if ((c1.fenzi == c2.fenzi) && (c1.fenmu == c2.fenmu))
{
flag = true;
return flag;
}
else
{
flag = false;
return flag;
}
}
bool judge2(const Fenshu &c1, int z)//判断正误
{
bool flag;
if (0==c1.fenzi-z)
{
flag = true;
return flag;
}
else
{
flag = false;
return flag;
}
}
void main()
{
int first, second, firstm, secondm;
int sign, i, j;
int num, chengchu, fushu, yushu, fanwei;
int ans,ansm,ansy;
int right = 0,wrong = 0;
Fenshu x1, x2, x, y;
cout << "请输入题目数量：";
cin >> num;
if (num == 0)
{
exit(1);
}
cout << "是否有乘除法？1.是，2.否：";
cin >> chengchu;
if (chengchu == 1)
{
cout << "除法是否有余数？1.是，2.否：";
cin >> yushu;
}
cout << "减法是否有负数？1.是，2.否：";
cin >> fushu;
cout << "请输入数值范围：";
cin >> fanwei;
srand((int)time(NULL)); //用时间做种子，每次产生随机数都不一样
for (i = 0; i<num; i++)
{
j = rand() % 2; //选择生成整数运算还是分数运算
if (j == 0) //选择整数
{
first = rand() % (fanwei + 1);
second = rand() % (fanwei + 1);
if (chengchu == 1)
{
sign = rand() % 4;
}
else
{
sign = rand() % 2;
}
switch (sign)
{
case 0: //整数加法
cout << first << "+" << second << "=" << endl;
cout << "请输入结果：";
cin >> ans;
if (ans == first + second)
{
cout << "答对了！" << endl;
right = right + 1;
}
else
{
cout << "答错了！" << endl;
wrong = wrong + 1;
}
break;
case 1: //整数减法
if (fushu == 1)
{
cout << first << "-" << second << "=" << endl;
cout << "请输入结果：";
cin >> ans;
if (ans == first - second)
{
cout << "答对了！" << endl;
right = right + 1;
}
else
{
cout << "答错了！" << endl;
wrong = wrong + 1;
}
}
else
{
if (first>second)
{
cout << first << "-" << second << "=" << endl;
cout << "请输入结果：";
cin >> ans;
if (ans == first - second)
{
cout << "答对了！" << endl;
right = right + 1;
}
else
{
cout << "答错了！" << endl;
wrong = wrong + 1;
}
}
else
{
cout << second << "-" << first << "=" << endl;
cout << "请输入结果：";
cin >> ans;
if (ans == second - first)
{
cout << "答对了！" << endl;
right = right + 1;
}
else
{
cout << "答错了！" << endl;
wrong = wrong + 1;
}
}
}
break;
case 2: //整数乘法
cout << first << "*" << second << "=" << endl;
cout << "请输入结果：";
cin >> ans;
if (ans == first * second)
{
cout << "答对了！" << endl;
right = right + 1;
}
else
{
cout << "答错了！" << endl;
wrong = wrong + 1;
}
break;
case 3: //整数除法
if (yushu == 1)
{
if (second != 0)
{
cout << first << "/" << second << "=" << endl;
cout << "请输入结果(商和余数)：";
cin >> ans>>ansy;
if ((ans == (first/second))&&(ansy == (first%second)))
{
cout << "答对了！" << endl;
right = right + 1;
}
else
{
cout << "答错了！" << endl;
wrong = wrong + 1;
}
}
else
{
i = i - 1;
}
}
else
{
if (second != 0 && (first%second == 0))
{
cout << first << "/" << second << "=" << endl;
cout << "请输入结果：";
cin >> ans;
if (ans == first / second)
{
cout << "答对了！" << endl;
right = right + 1;
}
else
{
cout << "答错了！" << endl;
wrong = wrong + 1;
}
}
else
{
i = i - 1;
}
}
break;
}
}
else //选择分数
{
first = rand() % (fanwei + 1);
second = rand() % (fanwei + 1);//分子
firstm = rand() % (fanwei + 1);
secondm = rand() % (fanwei + 1);//分母
if (chengchu == 1)
{
sign = rand() % 4;
}
else
{
sign = rand() % 2;
}
switch (sign)
{
case 0: //分数加法
if ((firstm != 0) && (secondm != 0) && (first<firstm) && (second<secondm))
{
cout << first << "/" << firstm << " + " << second << "/" << secondm << "=" << endl;
cout << "请输入结果（分子和分母）：";
cin >> ans >> ansm;
x.set(ans, ansm);
x1.set(first, firstm);
x2.set(second, secondm);
y = add(x1, x2);
if (true == judge1(x, y))
{
cout << "答对了！" << endl;
right = right + 1;
}
else
{
cout << "答错了！" << endl;
wrong = wrong + 1;
}
}
else
{
i = i - 1;
}
break;
case 1: //分数减法
if (fushu == 1)
{
if ((firstm != 0) && (secondm != 0) && (first<firstm) && (second<secondm))
{
cout << first << "/" << firstm << " - " << second << "/" << secondm << "=" << endl;
cout << "请输入结果（分子和分母）：";
cin >> ans ;
if(ans!=0)
{
cin >> ansm;
x.set(ans, ansm);
x1.set(first, firstm);
x2.set(second, secondm);
y = sub(x1, x2);
if (true == judge1(x, y))
{
cout << "答对了！" << endl;
right = right + 1;
}
else
{
cout << "答错了！" << endl;
wrong = wrong + 1;
}
}
else
{
x1.set(first, firstm);
x2.set(second, secondm);
y = sub(x1, x2);
if (true == judge2(y, ans))
{
cout << "答对了！" << endl;
right = right + 1;
}
else
{
cout << "答错了！" << endl;
wrong = wrong + 1;
}
}
}
else
{
i = i - 1;
}
}
else
{
if ((firstm != 0) && (secondm != 0) && (first<firstm) && (second<secondm) && ((first / firstm)>(second / secondm)))
{
cout << first << "/" << firstm << " - " << second << "/" << secondm << "=" << endl;
cout << "请输入结果（分子和分母）：";
cin >> ans ;
if(ans!=0)
{
cin >> ansm;
x.set(ans, ansm);
x1.set(first, firstm);
x2.set(second, secondm);
y = sub(x1, x2);
if (true == judge1(x, y))
{
cout << "答对了！" << endl;
right = right + 1;
}
else
{
cout << "答错了！" << endl;
wrong = wrong + 1;
}
}
else
{
x1.set(first, firstm);
x2.set(second, secondm);
y = sub(x1, x2);
if (true == judge2(y, ans))
{
cout << "答对了！" << endl;
right = right + 1;
}
else
{
cout << "答错了！" << endl;
wrong = wrong + 1;
}
}
}
else
{
i = i - 1;
}
}
break;
case 2: //分数乘法
if ((firstm != 0) && (secondm != 0) && (first<firstm) && (second<secondm))
{
cout << first << "/" << firstm << " * " << second << "/" << secondm << "=" << endl;
cout << "请输入结果（分子和分母）：";
cin >> ans ;
if(ans!=0)
{
cin >> ansm;
x.set(ans, ansm);
x1.set(first, firstm);
x2.set(second, secondm);
y = sub(x1, x2);
if (true == judge1(x, y))
{
cout << "答对了！" << endl;
right = right + 1;
}
else
{
cout << "答错了！" << endl;
wrong = wrong + 1;
}
}
else
{
x1.set(first, firstm);
x2.set(second, secondm);
y = sub(x1, x2);
if (true == judge2(y, ans))
{
cout << "答对了！" << endl;
right = right + 1;
}
else
{
cout << "答错了！" << endl;
wrong = wrong + 1;
}
}
}
else
{
i = i - 1;
}
break;
case 3: //分数除法
if ((firstm != 0) && (secondm != 0) && (first != 0) && (second != 0) && (first<firstm) && (second<secondm))
{
cout << first << "/" << firstm << " / " << second << "/" << secondm << "=" << endl;
cout << "请输入结果（分子和分母）：";
cin >> ans ;
if(ans!=0)
{
cin >> ansm;
x.set(ans, ansm);
x1.set(first, firstm);
x2.set(second, secondm);
y = sub(x1, x2);
if (true == judge1(x, y))
{
cout << "答对了！" << endl;
right = right + 1;
}
else
{
cout << "答错了！" << endl;
wrong = wrong + 1;
}
}
else
{
x1.set(first, firstm);
x2.set(second, secondm);
y = sub(x1, x2);
if (true == judge2(y, ans))
{
cout << "答对了！" << endl;
right = right + 1;
}
else
{
cout << "答错了！" << endl;
wrong = wrong + 1;
}
}
}
else
{
i = i - 1;
}
break;
}
}
}
cout << "总共完成" << num << "道题，做对" << right << "道，做错" << wrong << "道题！" << endl;
}
四、结果截图
周活动总结表
姓名：李俏 日期：2016年3月12日
| 日期 任务 | 听课 | 编写程序 | 阅读课本 | 准备考试 | 日总计 | ||
|
周一 |
120 | 60 | 30 | 210 | |||
|
周二 |
30 | 30 | |||||
|
周三 |
30 | 30 | |||||
|
周四 |
120 | 60 | 30 | 210 | |||
|
周五 |
30 | 30 | |||||
|
周六 |
180 | 30 | 210 | ||||
|
周总结 |
240 | 300 |
180 |
720 |
阶段时间和效率 周数：1
不包括上一周在内的累计时间
|
总计 |
240 |
300 |
180 |
720 |
|||
|
平均 |
240 |
300 |
180 |
720 |
|||
|
最大 |
240 |
300 |
180 |
720 |
|||
|
最小 |
240 |
300 |
180 |
720 |
以前各周的累计时间
|
总计 |
|||||||
|
平均 |
|||||||
|
最大 |
|||||||
|
最小 |
六、时间记录表：
学生： 李 俏 日期 ：2016年3月12日
教师： 王建民 课程 ：软件工程
|
日期 |
开始时间 |
结束时间 |
中断时间 |
净时间 |
活动 |
备注 |
|
3.7 |
16:30 |
17:30 |
无 |
60 |
编写程序 |
作业 |
|
20：00 |
20：30 |
无 |
30 |
阅读 |
作业 |
|
|
3.8 |
20：10 |
20：40 |
无 |
30 |
阅读 |
作业 |
|
3.9 |
20：00 |
20：40 |
10min |
30 |
wc |
|
|
3.10 |
18：50 |
19：50 |
无 |
60 |
编写程序 |
作业 |
|
20：00 |
20：30 |
无 |
30 |
阅读 |
作业 |
|
|
3.11 |
21：10 |
21：40 |
无 |
30 |
阅读 |
作业 |
|
3.12 |
11：00 |
14：30 |
30min |
180 |
编写程序 |
作业 |
七、缺陷记录日志：
学生 李俏
日期 2016年3月12日
教员 王建民
程序号
|
日期 |
编号 |
类型 |
引入阶段 |
排除阶段 |
修复时间 |
修复缺陷 |
|||||
|
3.7 |
1 |
20 |
编码 |
编译 |
5min |
||||||
|
描述：初次添加参数控制，控制语句放置错误 |
|||||||||||
|
3.10 |
2 |
20 |
编码 |
编译 |
10min |
||||||
|
描述：if...else...语句没有加大括号，导致层次不分明 |
|||||||||||
|
3.12 |
3 |
40 |
运行 |
运行后 |
10min |
||||||
|
描述：错删break，题目数目不对 |
|||||||||||
|
3.15 |
4 |
A |
编译 |
编译 |
1min |
||||||
|
描述：条件不成立时， 写成i=i+1，应该是i=i-i |
|||||||||||
时间： 2024-11-02 15:39:19