四则运算
一、作业要求规范
这个作业属于哪个课程 | https://edu.cnblogs.com/campus/ahgc/AHPU-se-JSJ18 |
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这个作业要求在哪里 | https://edu.cnblogs.com/campus/ahgc/AHPU-se-JSJ18/homework/11377 |
这个作业的目标 | 熟练使用markdown语法,实现具体要求 |
学号 | 3180701102 |
二、题目要求 | |
写一个能自动生成小学四则运算题目的程序,然后在此基础上扩展: | |
1)除了整数以外,还要支持真分数的四则运算,例如:1/6+1/8=7/24 | |
2)程序要求能处理用户的输入,判断对错,累积分数 | |
3)程序支持可以由用户自行选择加、减、乘、除运算 | |
4)使用-n参数控制生成题目的个数,例如Myapp.exe -n 10,将生成10个题目 | |
三、代码提交 |
#include <iostream>
#include <string.h>
#define size 10
using namespace std;
//含有一个二元算数式的三个值以及一个标志符的结构体
typedef struct{
int x1,x2;
int y1,y2;
int z1,z2;
}Arithmetic;
Arithmetic choose(Arithmetic n);//选择函数,根据用户选择 识别将要进行的四则运算类型
int LCM(int a, int b);//最小公倍数
int GCD(int a, int b);//最大公约数
bool judge(Arithmetic n);//结果判断
Arithmetic Addition();//加法运算
Arithmetic Subtraction();//减法运算
Arithmetic Multiplication();//乘法运算
Arithmetic Division();//除法运算
int main(int argc, const char * argv[]) {
int score = 0, cnt = 0;
printf("请设置题目数量\n");
scanf("%d",&cnt);
// if (string(argv[1])=="-n") { //在terminals或者command中运行的时候,参数顺序存放在argv数组中
// string c = argv[2];
// cnt = stoi(c);
// }
for (int i = 0; i<cnt; i++) {
Arithmetic t;
t = choose(t);
if (judge(t) == true) {
score+=10;
cout<<"恭喜您回答正确!\n";
} else {
cout<<"很抱歉您的答案不正确,再想想哦~\n";
}
}
printf("满分为:%d 您的得分为:%d分\n",cnt*10,score);
return 0;
}
//函数
//选择函数,根据用户选择识别将要进行的四则运算类型
Arithmetic choose(Arithmetic n){
int choose = 0;
cout<<"请选择您需要进行的四则运算类型\n"<<"1.加法\t2.减法\t3.乘法\t4.除法\n";
cin>>choose;
switch (choose) {
case 1:
n = Addition();
break;
case 2:
n = Subtraction();
break;
case 3:
n = Multiplication();
break;
case 4:
n = Division();
break;
default:
break;
}
return n;
}
//判断对错函数
bool judge(Arithmetic n){
bool ans = false; //ans用于记录用户输入答案是否正确,正确return true,否则return false
string input;
cin>>input;
bool flag = false, sign = false;
//flag标记用户输入中是否存在/号,有/号则true否则false
//sign标记用户输入是否为负数,是负数则true否则false
int a = 0, b = 0;
for (int i = 0; i<input.length(); i++) {
if (input[i] != '/' && input[i] != '-') {
int num = input[i]-'0'; //将char型转换为int型
if (!flag) { //若果flag为false,则说明还未遇到/号
a *= 10; //a记录/号前的数值
a += num;
} else {
b *= 10; //b记录/号后的数值
b += num;
}
} else if (input[i] == '/'){
flag = true;
} else {
sign = true;
}
}
if (flag && sign) { //既有/号,又是负值
if (n.z1 == -a && n.z2 == b)
ans = true;
} else if (flag && !sign){ //有/号,但为正值
if (n.z1 == a && n.z2 == b)
ans = true;
} else if (!flag && sign){ //没有有/号,但为负值
if (n.z1 == -a)
ans = true;
} else { //没有有/号,且为正值
if (n.z1 == a)
ans = true;
}
return ans;
}
//求最小公倍数
int LCM(int a, int b){
int tmp,r,n;
if (a < b) {
tmp = b;
b = a;
a = tmp;
}
r = a%b;
n = a*b;
while (r != 0) {
a = b;
b = r;
r = a%b;
}
return n/b;
}
//求最大公约数
int GCD(int a, int b){
int tmp,r,n;
if (a < b) {
tmp = b;
b = a;
a = tmp;
}
r = a%b;
n = a*b;
while (r != 0) {
a = b;
b = r;
r = a%b;
}
return b;
}
//Addition加法
Arithmetic Addition(){
Arithmetic n;
srand((unsigned)time(NULL));
if (rand()%2 == 0) {//若为0则进行整数四则运算,若为1则进行真分数的四则运算
n.x1 = rand()%size+1;
n.y1 = rand()%size+1;
n.z1 = n.x1 + n.y1;
n.x2 = 1;
n.y2 = 1;
n.z2 = 1;
printf("%d + %d = ?\n",n.x1,n.y1);
} else {
n.x1 = rand()%size+1;
n.x2 = rand()%size+n.x1;
n.y1 = rand()%size+1;
n.y2 = rand()%size+n.y1;
n.z2 = LCM(n.x2, n.y2);
n.z1 = n.x1*n.z2/n.y2 + n.y1*n.z2/n.x2;
printf("%d/%d + %d/%d = ?\n",n.x1,n.x2,n.y1,n.y2);
}
return n;
}
//Subtraction减法
Arithmetic Subtraction(){
Arithmetic n;
srand((unsigned)time(NULL));
if (rand()%2 == 0) {//若为偶数则进行整数四则运算,若为奇数则进行真分数的四则运算
n.x1 = rand()%size+1;
n.y1 = rand()%size+1;
n.z1 = n.x1 - n.y1;
n.x2 = 1;
n.y2 = 1;
n.z2 = 1;
printf("%d - %d = ?\n",n.x1,n.y1);
} else {
n.x1 = rand()%size+1;
n.x2 = rand()%size+n.x1;
n.y1 = rand()%size+1;
n.y2 = rand()%size+n.y1;
n.z2 = LCM(n.x2, n.y2);
n.z1 = n.x1*n.z2/n.y2 - n.y1*n.z2/n.x2;
printf("%d/%d - %d/%d = ?\n",n.x1,n.x2,n.y1,n.y2);
}
return n;
}
//Multiplication乘法
Arithmetic Multiplication(){
Arithmetic n;
srand((unsigned)time(NULL));
if (rand()%2 == 0) {//若为偶数则进行整数四则运算,若为奇数则进行真分数的四则运算
n.x1 = rand()%size+1;
n.y1 = rand()%size+1;
n.z1 = n.x1 * n.y1;
n.x2 = 1;
n.y2 = 1;
n.z2 = 1;
printf("%d * %d = ?\n",n.x1,n.y1);
} else {
n.x1 = rand()%size+1;
n.x2 = rand()%size+n.x1;
n.y1 = rand()%size+1;
n.y2 = rand()%size+n.y1;
int num = 0;
num = GCD(n.x1*n.y1, n.x2*n.y2);
n.z1 = n.x1*n.y1/num;
n.z2 = n.x2*n.y2/num;
printf("%d/%d * %d/%d = ?\n",n.x1,n.x2,n.y1,n.y2);
}
return n;
}
//Division除法
Arithmetic Division(){ //除法不需要考虑两个整数的,没有意义,直接两个真分数的除法
Arithmetic n;
srand((unsigned)time(NULL));
n.x1 = rand()%size+1;
n.x2 = rand()%size+n.x1;
n.y1 = rand()%size+1;
n.y2 = rand()%size+n.y1;
int num = 0;
num = GCD(n.x1*n.y1, n.x2*n.y2);
n.z1 = n.x1*n.y1/num;
n.z2 = n.x2*n.y2/num;
printf("%d/%d * %d/%d = ?\n",n.x1,n.x2,n.y1,n.y2);
return n;
}
四、运行截图
五、个人小结
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 | 10 | 8 |
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 | 100 | 150 |
Analysis | 需求分析(包括学习新技术 | 12 | 5 |
Design Spec | 生成设计文档 | 5 | 5 |
Design Review | 设计复审 | 5 | 5 |
Coding Standard | 代码规范 | 3 | 2 |
Design | 具体设计 | 10 | 12 |
Coding | 具体编码 | 36 | 21 |
Code Review | 代码复审 | 5 | 7 |
Test | 测试(自我测试,修改代码,提交修改) | 10 | 15 |
Reporting | 报告 | 9 | 6 |
Test Report | 测试报告 | 3 | 2 |
Size Measurement | 计算工作量 | 2 | 1 |
Postmortem & Process Improvement Plan | 事后总结,并提出过程改进计划 | 3 | 3 |