标签：
设计思想：
1.用户参数的设定
2.随机数的生成，包括运算符，运算数，和控制分数的数字
3.根据用户输入的参数，把四则运算分为两类，一类是不带括号的，一类是带括号的思则混合运算
4.不带括号的四则运算又可以分为有乘除和没有乘除法的
5.具体细节的设定，再加减法中结果是不是有负数，乘除法中有没有余数
6.分数中去掉分母为0的，分母为1的只需输出分子即可
7.带括号的四则混合运算，随机生成长度，和运算符存储在数组中，随机加上括号
8.利用for循环，生成四则运算
9.输出
源程序代码
#include<iostream> using namespace std; #include<time.h> int gcd(int x,int y) { int t,m,n,k=1; if(x>y) { t=x;x=y;y=t; } for(int i=x;i>=2;i--) { m=x%i;n=y%i; if(m==0&&n==0) { k=i;break; } } return k; } void main() { int number,ccselect,khselect,jjselect,ysselect,max; cout<<"请输入生成题的数目"; cin>>number; cout<<"请输入运算范围（1-？）"; cin>>max; cout<<"请选择是有无括号（1/2）"; cin>>khselect; if(khselect==2) { cout<<"请选择加减是否有负数（1/2）"; cin>>jjselect; cout<<"请选择是否有乘除法(1/2)";/*控制是否有乘除*/ cin>>ccselect; if(ccselect==1) { cout<<"请选择除法有无余数（1/2）"; cin>>ysselect; } } cout<<endl; for(int i=0;i<number;i++) { int fuhao=rand()%4; int a1=rand()%max; int a2=rand()%max+1; int b1=rand()%max; int b2=rand()%max+1; int k=rand()%2; if(k==0) { if(ccselect == 1) { if(fuhao==0) //加法运算 cout<<a1<<"+"<<b1<<"="<<endl; if(fuhao==1)//减法运算 { if(jjselect==2) { if(a1>b1) { cout<<a1<<"-"<<b1<<"="<<endl; } else { cout<<b1<<"-"<<a1<<"="<<endl; } } else if(jjselect==1) cout<<a1<<"-"<<b1<<"="<<endl; } if(fuhao==2)//乘法运算 { cout<<a1<<"*"<<b1<<"="<<endl; } if(fuhao==3)//除法运算 { if(ysselect==2) {//没有余数 for(int m=0;;) { if(a1!=0) { if(a1%b1!=0) { a1=rand()%max; b1=rand()%max; } else break; } else a1=rand()%max; } } cout<<a1<<"/"<<b1<<"="<<endl; } } else if(ccselect==2) {//没有乘除 int fuhao=rand()%2; if(fuhao==0) //加法运算 { cout<<a1<<"+"<<b1<<"="<<endl; } if(fuhao==1)//减法运算 { if(jjselect==2) { if(a1>b1) { cout<<a1<<"-"<<b1<<"="<<endl; } else { cout<<b1<<"-"<<a1<<"="<<endl; } } else if(jjselect==1) cout<<a1<<"-"<<b1<<"="<<endl; } } } else if(k==1) { int s2=gcd(a1,a2); a1=a1/s2; a2=a2/s2; int s3=gcd(b1,b2); b1=b1/s3; b2=b2/s3; if(ccselect == 1) { if(fuhao == 0) {/*分母不为1，分情况输出*/ if(a2!=1&&b2!=1) cout << a1 << "/" << a2 << " + " << b1 << "/" << b2 << " = " << endl; else if(a2==1) { cout << a1 <<" + " << b1 << "/" << b2 << " = " << endl; } else if(b2==1) { cout << a1 << "/" << a2 << " + " << b1 << " = " << endl; } } if(fuhao == 1) { if(jjselect==2) { if(a1/a2>=b1/b2) { if(a2!=1&&b2!=1) cout << a1 << "/" << a2 << " - " << b1 << "/" << b2 << " = " << endl; else if(a2==1) { cout << a1 <<" - " << b1 << "/" << b2 << " = " << endl; } else if(b2==1) { cout << a1 << "/" << a2 << " - " << b1 << " = " << endl; } } else { if(a2!=1&&b2!=1) cout << b1 << "/" << b2 << " - " << a1 << "/" << a2 << " = " << endl; else if(a2==1) { cout << b1 << "/" << b2 << " - " <<a1 << " = " << endl; } else if(b2==1) { cout << b1 <<" - " << a1 << "/" << a2 << " = " << endl; } } } else if(jjselect==1) { if(a2!=1&&b2!=1) cout << a1 << "/" << a2 << " + " << b1 << "/" << b2 << " = " << endl; else if(a2==1) { cout << a1 <<" + " << b1 << "/" << b2 << " = " << endl; } else if(b2==1) { cout << a1 << "/" << a2 << " + " << b1 << " = " << endl; } } } if(fuhao==2) { if(a2!=1&&b2!=1) cout << a1 << "/" << a2 << " * " << b1 << "/" << b2 << " = " << endl; else if(a2==1) { cout << a1 <<" * " << b1 << "/" << b2 << " = " << endl; } else if(b2==1) { cout << a1 << "/" << a2 << " * " << b1 << " = " << endl; } } if(fuhao==3) { if(a2!=1&&b2!=1) cout << a1 << "/" << a2 << " - " << b1 << "/" << b2 << " = " << endl; else if(a2==1&&a1!=0) { cout << a1 <<" * " << b1 << "/" << b2 << " = " << endl; } else if(b2==1&&b1!=0) { cout << a1 << "/" << a2 << " * " << b1 << " = " << endl; } } } else if(ccselect==2) { int fuhao=rand()%2; if(fuhao==0) { if(fuhao==0) { /*分母不为1，分情况输出*/ if(a2!=1&&b2!=1) cout << a1 << "/" << a2 << " + " << b1 << "/" << b2 << " = " << endl; else if(a2==1) { cout << a1 <<" + " << b1 << "/" << b2 << " = " << endl; } else if(b2==1) { cout << a1 << "/" << a2 << " + " << b1 << " = " << endl;} } } if(fuhao == 1) { if(jjselect==2) { if(a1/a2>=b1/b2) { if(a2!=1&&b2!=1) cout << a1 << "/" << a2 << " - " << b1 << "/" << b2 << " = " << endl; else if(a2==1) { cout << a1 <<" - " << b1 << "/" << b2 << " = " << endl; } else if(b2==1) { cout << a1 << "/" << a2 << " - " << b1 << " = " << endl; } } else { if(a2!=1&&b2!=1) cout << b1 << "/" << b2 << " - " << a1 << "/" << a2 << " = " << endl; else if(a2==1) { cout << b1 << "/" << b2 << " - " <<a1 << " = " << endl; } else if(b2==1) { cout << b1 <<" - " << a1 << "/" << a2 << " = " << endl; } } } else if(jjselect==1) { if(a2!=1&&b2!=1) cout << a1 << "/" << a2 << " + " << b1 << "/" << b2 << " = " << endl; else if(a2==1) { cout << a1 <<" + " << b1 << "/" << b2 << " = " << endl; } else if(b2==1) { cout << a1 << "/" << a2 << " + " << b1 << " = " << endl; } } } } } } }
运行结果截图：
反思：
最初的用结构体做的，但是这次增加了控制参数觉得分类不好分，所以直接定义变量，分类时候没考虑全，最后做出来的程序有很多bug，还有的功能没有完成带括号的混合运算还要接着做。
周活动总结表
姓名：hy 日期2016.3.19
| 日期/任务 | 听课 | 编写程序 | 阅读课本 | 日总计 |
| 星期日 | ||||
| 星期一 | 120 | 80 | 200 | |
| 星期二 | 40 | 40 | ||
| 星期三 | ||||
| 星期四 | 60 | 60 | ||
| 星期五 | ||||
| 星期六 | 160 | 60 | 220 | |
| 周总计 | 120 | 280 | 120 | 520 |
时间记录日志
姓名：hy 日期：2016.3.19
| 日期 | 开始时间 | 结束时间 | 中断时间 | 静时间 | 活动 | 备注 | C | U |
| 3.14 | 8：00 | 9：50 | 8：50-9：00 | 100 | 上课 | |||
| 3:00 | 5:00 | 120 |
设计思想 +编程 |
作业 | ||||
| 3.15 | 3:00 | 5:00 | 120 | 编程 | 作业 | |||
| 3.17 | 3:30 | 4:30 | 60 | 看书 | 作业 | |||
| 3.19 | 9:00 | 18:00 | 11:30-1:00 | 450 |
编程+ 发表博客 |
作业 |
缺陷记录日志
学生：hy 日期：2016.3.19
教员：王建民 程序号 03
| 日期 | 编号 | 类型 | 引入阶段 | 排除阶段 | 修复时间 | 修复缺陷 |
| 3.14 | 1 | 20 | 编程 | 编程 | 20 | |
| 描述：创建结构体错误 | ||||||
| 3.15 | 2 | 20 | 编程 | 编程 | 10 | |
| 描述：分数没有考虑分母为1的情况 | ||||||
| 3.19 | 3 | 20 | 编程 | 编程 | 10 | |
| 描述：分数化简错误 | ||||||
| 4 | 20 | 编程 | 编译 | 30 | ||
| 描述：题目出现两两成对重复出现出现 | ||||||
| 5 | 20 | 编程 | 编译 | 20 | ||
| 描述：题目只有加减法时出现数量少一半 | ||||||
| 6 | 20 | 编程 | 编译 | 10 | ||
| 描述：改完后程序卡死，循环错误 | ||||||
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原文地址：http://www.cnblogs.com/hyluckydog/p/5295727.html
