软工第二次作业
内容
预习
阅读讲义（ https://www.cnblogs.com/xinz/archive/2011/11/27/2265425.html ）第二部分内容 2. 个人开发技术
个人程序
（本作业内容来源于网址：https://www.cnblogs.com/xinz/p/7417960.html，
与 https://www.cnblogs.com/jiel/p/4810756.html ）
像《构建之法》的人物阿超那样，写一个能自动生成小学四则运算题目的命令行 “软件”。 可以使用C，C++，或者C#等语言实现。
要求
分别能够实现小学一、二、三、四、五年级的四则运算要求， 逐步实现各个年级的难度
要求能够通过输入来选择不同年级，每个年级还得区分难，中，易三个等级
对于三、四、五年级需要支持括号与多个运算符
程序支持判断对错及累计得分与时间
一次可以出100道题目，而且不能重复（比如2+3 与 3+2 算重复的）
充分发挥想象增加满足小学生数学检测需要的功能
作业2
git学习与码云代码托管平台gitee
阅读网址如下关于git的使用
https://www.liaoxuefeng.com/wiki/896043488029600
或
https://gitee.com/help/categories/43
通过之前已经注册的码云账号，学会简单的使用
将作业1所写代码托管到gitee平台上个人仓库
在博客园给出作业并包括所写的代码，同时给出托管于gitee上的链接
代码链接
https://gitee.com/tao_tao_chen1/soft_work/blob/master/Math.cpp
感想
抓狂，原本打算根据PAT算法题里面的简单计算器进行改良从而实现所有功能，但是因为数据结构功底不扎实，那个代码怎么改都改不对，只能用最基础的循环分支语句来写，代码写了近600行，但有价值的东西较少，总算实现了分数的计算，由于时间关系，计时和没有重复的功能没有实现，下次有机会再回来修改。#
代码
/*假定四则运算
一年级简单程度是10以内2个数加减法，中等程度是10以内3个数加减法，困难程度是20以内3个数加减法
二年级简单程度是100以内2个数加减法，中等程度是100以内3个数加减法，困难程度是1000以内3个数加减法
三年级简单程度是2位数乘1位数乘法，中等是2位数乘2位数乘法。困难是1位数乘法和加减法的混合运算
四年级简单程度是2位数除1位数除法，中等是2位数乘除法混合运算，困难是3位数乘除法的混合运算（答案以整数加余数的形式展现）(a/b/c类型的答案以3位小数展现且abc可为小数)
五年级简单程度是四个分数加减运算，中等是四个分数的的乘除运算，困难是4个分数的混合运算（答案以带分数形式给出）
*/
#include<stdio.h>
#include<iostream>
#include <stdlib.h>
#include <time.h>
using namespace std;
//下面的代码根据算法笔记A1081 分数的四则运算修改而得
typedef long long ll;
int ans4,ans5,ans6;//带分数
ll gcd(ll a,ll b){//求最大公约数的辗转相除法递归写法
return b==0?a:gcd(b,a%b);
}
struct Fraction{//分数
ll up,down;//分子，分母
};
Fraction reduction(Fraction result){//分数的化简
if(result.down<0){
result.down=-result.down;
result.up=-result.up;
}
if(result.up==0){
result.down=1;
}else{
int d=gcd(abs(result.up),abs(result.down));
result.down/=d;
result.up/=d;
}
return result;
}
//分数的加减乘除
Fraction add(Fraction f1,Fraction f2){
Fraction result;
result.up=f1.up*f2.down+f2.up *f1.down;
result.down=f1.down*f2.down;
return reduction(result);
}
Fraction minu(Fraction f1,Fraction f2){
Fraction result;
result.up=f1.up*f2.down-f2.up *f1.down;
result.down=f1.down*f2.down;
return reduction(result);
}
Fraction multi(Fraction f1,Fraction f2){
Fraction result;
result.up=f1.up*f2.up;
result.down=f1.down*f2.down;
return reduction(result);
}
Fraction divide(Fraction f1,Fraction f2){
Fraction result;
result.up=f1.up*f2.down;
result.down=f1.down*f2.up;
return reduction(result);
}
//分数的输出
void showResult(Fraction r){
reduction(r);
if(r.down==1) printf("%lld
",r.up);
else if(abs(r.up)>r.down){//假分数
ans4=r.up/r.down;
ans5=abs(r.up)%r.down;
ans6=r.down;
}else{//真分数
ans4=0;
ans5=r.up;
ans6=r.down;
}
}
int ans;
int ans1;//除法所得结果整数部分
int ans2;//除法所得结果余数部分
double ans3;//(a/b/c类型的答案以3位小数展现)
int a1[100],b1[100],c1[100];//10以内整数
int main(){
Fraction sum,sum2,temp,sum3,sum4;
sum.up=0;
sum.down=1;
sum2.up=0;
sum2.down=1;
sum3.up=1;
sum3.down=1;
sum4.up=1;
sum4.down=1;
int right=0;
int wrong=0;
int grade;
int degree;//3 Difficulty level,respectively are difficult=3 medium=2 easy=1
int num;//题目数量
printf("请输入你的年级，一年级输入1，二年级输入2，三年级输入3，四年级输入4，五年级输入5
");
scanf("%d",&grade);
printf("请选择难易程度，选择简单输入1，选择中等输入2，选择困难输入3
");
scanf("%d",°ree);
switch(grade){
case 1:
if(degree==1){
printf("这是一年级运算简单程度
");
printf("请输入题目数量
");
scanf("%d",&num);
srand((unsigned) (time(NULL)));
for(int i=0;i<num;i++){
int n1=rand()%10;
int n2=rand()%10;
if(n1>=n2){
a1[i]=n1;
b1[i]=n2;
}
else{
a1[i]=n2;
b1[i]=n1;
}
}
for(int i=0;i<num/2;i++){
printf(" %d + %d =
",a1[i],b1[i]);
scanf("%d",&ans);
if(a1[i]+b1[i]==ans){
printf("回答正确!
");
right++;
}
else{
printf("回答错误!
");
wrong++;
}
}
for(int i=num/2;i<num;i++){
printf("
%d -%d = ",a1[i],b1[i]);
scanf("%d",&ans);
if(a1[i]-b1[i]==ans){
printf("回答正确!
");
right++;
}
else{
printf("回答错误!
");
wrong++;
}
}
printf("你一共答对了%d道题，答错了%d道题
",right,wrong);
}
else if(degree==2){printf("这是一年级运算中等程度");
printf("请输入题目数量
");
scanf("%d",&num);
for(int i=0;i<num;){
int n1=rand()%10;
int n2=rand()%10;
int n3=rand()%10;
if(n1+n2-n3>=0&&n1+n3-n2>=0){
a1[i]=n1;
b1[i]=n2;
c1[i]=n3;
i++;}
}
for(int i=0;i<num/2;i++){
printf(" %d + %d -%d=
",a1[i],b1[i],c1[i]);
scanf("%d",&ans);
if(a1[i]+b1[i]-c1[i]==ans){
printf("回答正确!
");
right++;}
else{
printf("回答错误!
");
wrong++;}
}
for(int i=num/2;i<num;i++){
printf("
%d -%d +%d= ",a1[i],b1[i],c1[i]);
scanf("%d",&ans);
if(a1[i]-b1[i]+c1[i]==ans){
printf("回答正确!
");
right++;}
else{
printf("回答错误!
");
wrong++; }
}
printf("你一共答对了%d道题，答错了%d道题
",right,wrong);
}
else{
printf("这是一年级运算困难程度");
printf("请输入题目数量
");
scanf("%d",&num);
for(int i=0;i<num;){
int n1=rand()%10;
int n2=rand()%10;
int n3=rand()%10;
if(n1+n2-n3>=0&&n1+n3-n2>=0){
a1[i]=n1+10;
b1[i]=n2+10;
c1[i]=n3+10;
i++;}
}
for(int i=0;i<num/2;i++){
printf(" %d + %d -%d=
",a1[i],b1[i],c1[i]);
scanf("%d",&ans);
if(a1[i]+b1[i]-c1[i]==ans){
printf("回答正确!
");
right++;}
else{
printf("回答错误!
");
wrong++;}
}
for(int i=num/2;i<num;i++){
printf("
%d -%d +%d= ",a1[i],b1[i],c1[i]);
scanf("%d",&ans);
if(a1[i]-b1[i]+c1[i]==ans){
printf("回答正确!
");
right++;}
else{
printf("回答错误!
");
wrong++; }
}
printf("你一共答对了%d道题，答错了%d道题
",right,wrong);
}
break;
case 2:
if(degree==1){printf("这是二年级运算简单程度");
printf("请输入题目数量
");
scanf("%d",&num);
srand((unsigned) (time(NULL)));
for(int i=0;i<num;i++){
int n1=rand()%100;
int n2=rand()%100;
if(n1>=n2){
a1[i]=n1;
b1[i]=n2;
}
else{
a1[i]=n2;
b1[i]=n1;
}
}
for(int i=0;i<num/2;i++){
printf(" %d + %d =
",a1[i],b1[i]);
scanf("%d",&ans);
if(a1[i]+b1[i]==ans){
printf("回答正确!
");
right++;
}
else{
printf("回答错误!
");
wrong++;
}
}
for(int i=num/2;i<num;i++){
printf("
%d -%d = ",a1[i],b1[i]);
scanf("%d",&ans);
if(a1[i]-b1[i]==ans){
printf("回答正确!
");
right++;
}
else{
printf("回答错误!
");
wrong++;
}
}
printf("你一共答对了%d道题，答错了%d道题
",right,wrong);}
else if(degree==2){printf("这是二年级运算中等程度");
printf("请输入题目数量
");
scanf("%d",&num);
for(int i=0;i<num;){
int n1=rand()%100;
int n2=rand()%100;
int n3=rand()%100;
if(n1+n2-n3>=0&&n1+n3-n2>=0){
a1[i]=n1;
b1[i]=n2;
c1[i]=n3;
i++;}
}
for(int i=0;i<num/2;i++){
printf(" %d + %d -%d=
",a1[i],b1[i],c1[i]);
scanf("%d",&ans);
if(a1[i]+b1[i]-c1[i]==ans){
printf("回答正确!
");
right++;}
else{
printf("回答错误!
");
wrong++;}
}
for(int i=num/2;i<num;i++){
printf("
%d -%d +%d= ",a1[i],b1[i],c1[i]);
scanf("%d",&ans);
if(a1[i]-b1[i]+c1[i]==ans){
printf("回答正确!
");
right++;}
else{
printf("回答错误!
");
wrong++; }
}
printf("你一共答对了%d道题，答错了%d道题
",right,wrong);}
else{printf("这是二年级运算困难程度");
printf("请输入题目数量
");
scanf("%d",&num);
for(int i=0;i<num;){
int n1=rand()%1000;
int n2=rand()%1000;
int n3=rand()%1000;
if(n1+n2-n3>=0&&n1+n3-n2>=0){
a1[i]=n1;
b1[i]=n2;
c1[i]=n3;
i++;}
}
for(int i=0;i<num/2;i++){
printf(" %d + %d -%d=
",a1[i],b1[i],c1[i]);
scanf("%d",&ans);
if(a1[i]+b1[i]-c1[i]==ans){
printf("回答正确!
");
right++;}
else{
printf("回答错误!
");
wrong++;}
}
for(int i=num/2;i<num;i++){
printf("
%d -%d +%d= ",a1[i],b1[i],c1[i]);
scanf("%d",&ans);
if(a1[i]-b1[i]+c1[i]==ans){
printf("回答正确!
");
right++;}
else{
printf("回答错误!
");
wrong++; }
}
printf("你一共答对了%d道题，答错了%d道题
",right,wrong);}
break;
case 3:
if(degree==1){printf("这是三年级运算简单程度");
printf("请输入题目数量
");
scanf("%d",&num);
srand((unsigned) (time(NULL)));
for(int i=0;i<num;i++){
int n1=rand()%100;
int n2=rand()%10;
printf(" %d * %d =
",n1,n2);
scanf("%d",&ans);
if(n1*n2==ans){
printf("回答正确!
");
right++;}
else{
printf("回答错误!
");
wrong++;}
}
printf("你一共答对了%d道题，答错了%d道题
",right,wrong);
}
else if(degree==2){printf("这是三年级运算中等程度");
printf("请输入题目数量
");
scanf("%d",&num);
srand((unsigned) (time(NULL)));
for(int i=0;i<num;i++){
int n1=rand()%100;
int n2=rand()%100;
printf(" %d * %d =
",n1,n2);
scanf("%d",&ans);
if(n1*n2==ans){
printf("回答正确!
");
right++;}
else{
printf("回答错误!
");
wrong++;}
}
printf("你一共答对了%d道题，答错了%d道题
",right,wrong);}
else{printf("这是三年级运算困难程度");
printf("请输入题目数量
");
scanf("%d",&num);
srand((unsigned) (time(NULL)));
for(int i=0;i<num;){
int n1=rand()%10;
int n2=rand()%10;
int n3=rand()%100;
if(n1*n2-n3>0){
i++;
printf(" %d * %d-%d =
",n1,n2,n3);
scanf("%d",&ans);
if(n1*n2-n3==ans){
printf("回答正确!
");
right++;}
else{
printf("回答错误!
");
wrong++;}
}
else{
i++;
printf(" %d * %d+%d =
",n1,n2,n3);
scanf("%d",&ans);
if(n1*n2+n3==ans){
printf("回答正确!
");
right++;}
else{
printf("回答错误!
");
wrong++;}
}
}
printf("你一共答对了%d道题，答错了%d道题
",right,wrong);}
break;
case 4:
if(degree==1){
printf("这是四年级运算简单程度");
printf("请输入题目数量
");
scanf("%d",&num);
srand((unsigned) (time(NULL)));
for(int i=0;i<num;i++){
int n1=rand()%100;
int n2=rand()%10;
printf(" %d / %d =
",n1,n2);
scanf("%d %d",&ans1,&ans2);
if(n1/n2==ans1&&n1%n2==ans2){
printf("回答正确!
");
right++;}
else{
printf("回答错误!
");
wrong++;}
}
printf("你一共答对了%d道题，答错了%d道题
",right,wrong);
}
else if(degree==2){printf("这是四年级运算中等程度");
printf("请输入题目数量
");
scanf("%d",&num);
srand((unsigned) (time(NULL)));
for(int i=0;i<num/2;i++){
int n1=rand()%100;
int n2=rand()%100;
int n3=rand()%100;
printf(" %d * %d/%d =
",n1,n2,n3);
scanf("%d %d",&ans1,&ans2);
if(n1*n2/n3==ans1&&n1*n2%n3==ans2){
printf("回答正确!
");
right++;}
else{
printf("回答错误!
");
wrong++;}
}
for(int i=num/2;i<num;i++){
double n1=rand()%100;
double n2=rand()%100;
double n3=rand()%10;
printf(" %.f /%.f/%.f =
",n1,n2,n3);
scanf("%lf",&ans3);//注意 scanf("%.3f",&ans3); 这种写法是错误的
double c=n1/(n2*n3);
c=(int)(1000.0*c+0.5)/1000.0;//将计算结果保留为三位小数
if(c==ans3){
printf("回答正确!
");
right++;}
else{
printf("回答错误!
");
wrong++;}
}
printf("你一共答对了%d道题，答错了%d道题
",right,wrong);
}
else{printf("这是四年级运算困难程度");
printf("请输入题目数量
");
scanf("%d",&num);
srand((unsigned) (time(NULL)));
for(int i=0;i<num/2;i++){
int n1=rand()%1000;
int n2=rand()%1000;
int n3=rand()%1000;
printf(" %d * %d/%d =
",n1,n2,n3);
scanf("%d %d",&ans1,&ans2);
if(n1*n2/n3==ans1&&n1*n2%n3==ans2){
printf("回答正确!
");
right++;}
else{
printf("回答错误!
");
wrong++;}
}
for(int i=num/2;i<num;i++){
double n1=rand()%1000;
double n2=rand()%1000;
double n3=rand()%100;
printf(" %.f /%.f/%.f =
",n1,n2,n3);
scanf("%lf",&ans3);//注意 scanf("%.3f",&ans3); 这种写法是错误的
double c=n1/(n2*n3);
c=(int)(1000.0*c+0.5)/1000.0;//将计算结果保留为三位小数
if(c==ans3){
printf("回答正确!
");
right++;}
else{
printf("回答错误!
");
wrong++;}
}
printf("你一共答对了%d道题，答错了%d道题
",right,wrong);
}
break;
default://五年级
if(degree==1){printf("这是五年级运算简单程度");
printf("请输入题目数量
");
scanf("%d",&num);
srand((unsigned) (time(NULL)));
for(int i=0;i<num;i++){
sum.up=0;
sum.down=1;
for(int i=0;i<2;i++){
temp.up=rand()%10;
temp.down=rand()%10+1;
printf("%lld/%lld+",temp.up,temp.down);
sum=add(sum,temp);
}
temp.up=rand()%10;
temp.down=rand()%10+1;
printf("%lld/%lld-",temp.up,temp.down);
sum=add(sum,temp);
temp.up=rand()%10;
temp.down=rand()%10+1;
printf("%lld/%lld=",temp.up,temp.down);
sum=minu(sum,temp);
showResult(sum);
int o=0,p=0,q=0;
scanf("%d %d/%d",&o,&p,&q);
if(o==ans4&&p==ans5&&q==ans6){ printf("回答正确!
");
right++;}
else{
printf("回答错误!
");
wrong++;}
}
}
else if(degree==2){printf("这是五年级运算中等程度");
printf("请输入题目数量
");
scanf("%d",&num);
srand((unsigned) (time(NULL)));
for(int i=0;i<num;i++){
sum3.up=1;
sum3.down=1;
for(int i=0;i<2;i++){
temp.up=rand()%10;
temp.down=rand()%10+1;
printf("%lld/%lld*",temp.up,temp.down);
sum3=multi(sum3,temp);
}
temp.up=rand()%10;
temp.down=rand()%10+1;
printf("%lld/%lld/",temp.up,temp.down);
sum3=multi(sum3,temp);
temp.up=rand()%10;
temp.down=rand()%10+1;
printf("%lld/%lld=",temp.up,temp.down);
sum3=divide(sum3,temp);
showResult(sum3);
int o=0,p=0,q=0;
scanf("%d %d/%d",&o,&p,&q);
if(o==ans4&&p==ans5&&q==ans6){ printf("回答正确!
");
right++;}
else{
printf("回答错误!
");
wrong++;}
}
}
else{printf("这是五年级运算困难程度");
printf("请输入题目数量
");
scanf("%d",&num);
srand((unsigned) (time(NULL)));
for(int i=0;i<num;i++){
sum3.up=1;
sum3.down=1;
for(int i=0;i<2;i++){
temp.up=rand()%10;
temp.down=rand()%10+1;
printf("%lld/%lld*",temp.up,temp.down);
sum3=multi(sum3,temp);
}
temp.up=rand()%10;
temp.down=rand()%10+1;
printf("%lld/%lld/",temp.up,temp.down);
sum3=multi(sum3,temp);
temp.up=rand()%10;
temp.down=rand()%10+1;
printf("%lld/%lld=",temp.up,temp.down);
sum3=divide(sum3,temp);
showResult(sum3);
int o=0,p=0,q=0;
scanf("%d %d/%d",&o,&p,&q);
if(o==ans4&&p==ans5&&q==ans6){ printf("回答正确!
");
right++;}
else{
printf("回答错误!
");
wrong++;}
}
}
}
system("pause");
return 0;
}