作业-四则运算

|博客班级 | https://edu.cnblogs.com/campus/ahgc/AHPU-SE-19/ |
|作业要求 | https://edu.cnblogs.com/campus/ahgc/AHPU-SE-19/homework/11376|
|作业目标 | 写一个能自动生成小学四则运算题目的程序 |
|学号 | 3190704117 |

代码：

#include<stdio.h>
#include<stdlib.h>
#include<time.h>
#include<string.h>
#include<Windows.h>
#include<iostream>
using namespace std;
int grade = 0;
//加法
void add()
{
int a, b, c, d;
a = rand() % 100;
b = rand() % 100;
cout << a << " + " << b << " = ";
cin >> c;
d = a + b;
if (d == c)
cout << "√ 得1分,分数：" << ++grade << endl;
else cout << "× 不得分"<<endl;
}
//减法
void minu()
{
int a, b, c, d;
a = rand() % 100;
b = rand() % 100;
cout << a << " - " << b << " = ";
cin >> c;
d = a - b;
if (d == c)
cout << "√ 得1分,分数：" << ++grade << endl;
else cout << "× 不得分"<<endl;
}
//乘法
void multi()
{
int a, b, c, d;
a = rand() % 100;
b = rand() % 100;
cout << a << " * " << b << " = ";
cin >> c;
d = a * b;
if (d == c)
cout << "√ 得1分,分数：" << ++grade << endl;
else cout << "× 不得分"<<endl;
}
//除法
void divider()
{
int c, d;
float a, b, e, f;
while(1)
{
a = rand() % 100;
b = rand() % 100;
if (b != 0)
break;
}
cout << a << " / " << b << " = ";
cin >> e;
e = 100 * e;
c = (int)e;
f = a / b;
f = 100 * f;
d = (int)f;
if (d == c)
cout << "√ 得1分,分数：" << ++grade << endl;
else cout << "× 不得分"<<endl;
}
//混合运算
void hy_operat()
{
int a, b, c, d, e, f;
int m = 1;
float g, h;
a = rand() % 100;
b = rand() % 100;
c = rand() % 100;
d = rand() % 7;
while (m)
{
switch (d)
{
//带括号乘法加法
case 0:
{
cout << a << " *( " << b << " + " << c << ")" << " = ";
cin >> e;
f = a*(b + c);
if(f == e)
cout << "√ 得1分,分数：" << ++grade << endl;
else cout << "× 不得分" << endl;
}
m = 0;
break;
//不带括号乘法加法
case 1:
{
cout << a << " *" << b << " + " << c << " = ";
cin >> e;
f = a*b + c;
if (f == e)
cout << "√ 得1分,分数：" << ++grade << endl;
else cout << "× 不得分" << endl;
}
m = 0;
break;
//带括号乘法减法
case 2:
{
cout << a << " *( " << b << " - " << c << ")" << " = ";
cin >> e;
f = a*(b - c);
if (f == e)
cout << "√ 得1分,分数：" << ++grade << endl;
else cout << "× 不得分" << endl;
}
m = 0;
break;
//不带括号乘法减法
case 3:
{
cout << a << " *" << b << " - " << c << " = ";
cin >> e;
f = a*b - c;
if (f == e)
cout << "√ 得1分,分数：" << ++grade << endl;
else cout << "× 不得分" << endl;
}
m = 0;
break;
//带括号除法加法,除法中采用float类型定义变量且保留两位有效数字，
case 4:
{
cout << a << " /( " << b << " + " << c << ")" << " = ";
if (0 == b + c)
break;
cin >> g;
g = 100 * g;
e = (int)g;
float c1 = (float)c;
float b1 = (float)b;
float a1 = (float)a;
h = a1/(b1 + c1);
h = 100 * h;
f = (int)h;
if (f == e)
cout << "√ 得1分,分数：" << ++grade << endl;
else cout << "× 不得分" << endl;
}
m = 5;
break;
//不带括号除法加法
case 5:
{
cout << a << " /" << b << " + " << c << " = ";
if (0 == b)
break;
cin >> g;
g = 100 * g;
e = (int)g;
float c1 = (float)c;
float b1 = (float)b;
float a1 = (float)a;
h = a1 / (b1 + c1);
h = 100 * h;
f = (int)h;
if (f == e)
cout << "√ 得1分,分数：" << ++grade << endl;
else cout << "× 不得分" << endl;
}
m = 0;
break;
//带括号除法减法
case 6:
{
cout << a << " /( " << b << " - " << c << ")" << " = ";
if (0 == b - c)
break;
cin >> g;
g = 100 * g;
e = (int)g;
float c1 = (float)c;
float b1 = (float)b;
float a1 = (float)a;
h = a1 / (b1 + c1);
h = 100 * h;
f = (int)h;
if (f == e)
cout << "√ 得1分,分数：" << ++grade << endl;
else cout << "× 不得分" << endl;
}
m = 0;
break;
//不带括号除法减法
case 7:
{
cout << a << " /" << b << " - " << c << " = ";
if (0 == b)
break;
cin >> g;
g = 100 * g;
e = (int)g;
float c1 = (float)c;
float b1 = (float)b;
float a1 = (float)a;
h = a1 / b1 + c1;
h = 100 * h;
f = (int)h;
if (f == e)
cout << "√ 得1分,分数：" << ++grade << endl;
else cout << "× 不得分" << endl;
}break;
default:
break;
}

}
}
void automatic()//生成四则运算
{
srand((unsigned)time(NULL));
int choose;//选择生成的题目数
int i;
float j;
cout << "除法保留两位小数点，不四舍五入" << endl;
cout << "请输入需要生成的题目数：";
cin >> choose;
int count = 0;//统计题目数
while (1)
{
i = rand() % 5;
switch (i)
{
//加法
case 0: add();

count++;
break;
//减法
case 1: minu();
count++;
break;
//乘法
case 2:multi();
count++;
break;
//除法
case 3:divider();
count++;
break;
//混合运算
case 4:hy_operat();
count++;
break;
default:cout << "程序错误！";
break;
}
if (count == choose)
break;
}
cout << "总分数：" << grade ;
j = (float)grade / choose;
cout << "正确率：" << j << endl;
}
void main()
{
char yes='y', ch;
one: 
automatic();
cout << "是否继续生成题目？(y/n)" << endl;
cin >> ch;
if (yes == ch)
{
system("cls");
goto one;
}
}

运行结果·：

 

 

 

 

psp2.1	任务内容	计划完成需要的时间（min）	实际完成需要的时间（min）
Planning	计划	15	10
Estimate	估计这个任务需要多少时间，并规划大致工作步骤	10	12
Development	开发	150	150
Analysis	需求分析（包括学习新技术）	12	8
Design Spec	生成设计文档	10	7
Design Review	设计复审	5	8
Coding Standard	代码规范	10	7
Design	具体设计	15	20
Coding	具体编码	36	30
Code Review	代码复审	5	9
Test	测试（自我测试，修改代码，提交修改）	15	15
Reporting	报告	9	9
Test Report	测试报告	3	7
Size Measurement	计算工作量	5	5
Postmortem & Process Improvement Plan	事后总结，并提出过程改进计划	5	5