四则运算
一、作业规范要求
发布一篇随笔,使用markdown语法进行编辑
文字准确,样式清晰
请在本次及之后的每次作业随笔的最前面加上以下内容
| 博客班级 | https://edu.cnblogs.com/campus/ahgc/AHPU-se-JSJ18 |
| ---- | ---- | ---- |
| 作业要求 | https://edu.cnblogs.com/campus/ahgc/AHPU-se-JSJ18/homework/11377 |
| 作业目标 | <你理解的作业目标具体内容> |
| 学号 | <3180701113> |
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
1)提交你的源代码在你的博客上,注释好各个函数,给出相应解释,并把运行成功的界面粘贴到博客上;
2)要求逻辑清晰,界面整洁
#include <stdio.h>
#include<iostream>
#include <stdlib.h>
#include <time.h>
#include <string.h>
using namespace std;
typedef struct //定义分数结构体
{
int up, down;
}fraction;
int gcd(int a, int b) //最大公约数
{
if (b == 0) return a;
return gcd(b, a % b);
}
void yuefen(int &a, int &b,int flag) //分数约分,并自动进行输出,用flag标志答案,答案不输出
{
int d = gcd(abs(a), abs(b));
a /= d;
b /= d;
if (flag == 0) {
if (b == 1)printf("%d", a);
else printf("%d/%d", a, b);
}
}
void add(int num,fraction fraans[],int ans[]) //加法题目生成及运算
{
int a, b, up1, down1, up2, down2,flag=0,i;
for (i = 0; i <=num / 2; i++) //整数部分
{
unsigned int times = (unsigned int)time(0); //生成随机数
srand(times * (i + 1));
a = rand() % 10 + 1;
b = rand() % 10 + 1;
ans[i] = a + b;
printf("%d.%d+%d\n", i+1, a, b); //输出整数题目
}
for (i = num/2+1; i < num; i++) //分数部分
{
unsigned int times = (unsigned int)time(0);
srand(times * (i + 1));
up1 = rand() % 10 + 1;
down1 = rand() % 10 + 1;
up2 = rand() % 10 + 1;
down2 = rand() % 10 + 1;
printf("%d.", i + 1);
yuefen(up1, down1,flag);
printf("+");
yuefen(up2, down2,flag);
printf("\n"); //将随机生成的分数进行约分后再输出
fraans[i].up = up1 * down2 + up2 * down1;
fraans[i].down = down1 * down2;
flag = 1; //用flag标志答案,对答案不进行输出
yuefen(fraans[i].up, fraans[i].down,flag);
flag = 0;
}
}
void subtract(int num, fraction fraans[], int ans[]) //减法题目生成及运算
{
int a, b, up1, down1, up2, down2,flag=0,i;
for (i = 0; i <= num / 2; i++)
{
unsigned int times = (unsigned int)time(0);
srand(times * (i + 1));
a = rand() % 10 + 1;
b = rand() % 10 + 1;
ans[i] = a - b;
printf("%d.%d-%d\n", i, a, b);
}
for (i = num / 2 + 1; i < num; i++)
{
unsigned int times = (unsigned int)time(0);
srand(times * (i + 1));
up1 = rand() % 10 + 1;
down1 = rand() % 10 + 1;
up2 = rand() % 10 + 1;
down2 = rand() % 10 + 1;
printf("%d.", i + 1);
yuefen(up1, down1, flag);
printf("-");
yuefen(up2, down2, flag);
printf("\n");
fraans[i].up = up1 * down2 - up2 * down1;
fraans[i].down = down1 * down2;
flag = 1;
yuefen(fraans[i].up, fraans[i].down, flag);
flag = 0;
}
}
void multiply(int num, fraction fraans[], int ans[]) //乘法题目生成及运算
{
int a, b, up1, down1, up2, down2,flag = 0,i;
for (i = 0; i <= num / 2; i++)
{
unsigned int times = (unsigned int)time(0);
srand(times * (i + 1));
a = rand() % 10 + 1;
b = rand() % 10 + 1;
ans[i] = a * b;
printf("%d.%d*%d\n", i+1, a, b);
}
for (i = num / 2 + 1; i < num; i++)
{
unsigned int times = (unsigned int)time(0);
srand(times * (i + 1));
up1 = rand() % 10 + 1;
down1 = rand() % 10 + 1;
up2 = rand() % 10 + 1;
down2 = rand() % 10 + 1;
printf("%d.", i + 1);
yuefen(up1, down1, flag);
printf("*");
yuefen(up2, down2, flag);
printf("\n");
fraans[i].up = up1 * up2;
fraans[i].down = down1 * down2;
flag = 1;
yuefen(fraans[i].up, fraans[i].down, flag);
flag = 0;
}
}
void divide(int num, fraction fraans[]) //除法题目生成及运算
{
int up1, down1, up2, down2, flag = 0;
for (int i = 0; i < num; i++)
{
unsigned int times = (unsigned int)time(0);
srand(times * (i + 1));
up1 = rand() % 10 + 1;
down1 = rand() % 10 + 1;
up2 = rand() % 10 + 1;
down2 = rand() % 10 + 1;
printf("%d. ", i + 1);
yuefen(up1, down1, flag);
printf(" / ");
yuefen(up2, down2, flag);
printf(" \n");
fraans[i].up = up1 * down2;
fraans[i].down = down1 * up2;
flag = 1;
yuefen(fraans[i].up, fraans[i].down, flag);
flag = 0;
}
}
int main()
{
char f = 'Y';
while(f!='N'&&f!='n')
{
fraction fraans[400], userfraans[400];
int ans[100] = { 0 }, userans[100] = { 0 },i;
int num, symbol, grade = 0;
printf("四则运算题目生成程序\n");
printf("请选择符号,1,2,3,4对应加减乘除:");
scanf("%d", &symbol); //用symbol标志用户选择的符号,1234对应加减乘除;
printf("请输入题目数量(最少为2,最大100):");
scanf("%d", &num);
switch (symbol) //对应选择不同的算法
{
case 1:add(num, fraans, ans); break;
case 2:subtract(num, fraans, ans); break;
case 3:multiply(num, fraans, ans); break;
case 4:divide(num, fraans); break;
}
if (symbol != 4) //当用户选择的运算不为除法时,分别对整数和分数答案进行保存
{
for ( i = 0; i <= num / 2; i++)
{
printf("第%d道题的答案为:", i + 1);
scanf("%d", &userans[i]);
}
for ( i = num / 2 + 1; i < num; i++)
{
printf("第%d道题的答案为:", i + 1);
if (fraans[i].down == 1)
{
scanf("%d", &userfraans[i].up);
userfraans[i].down = 1;
}
else
{
scanf("%d/%d", &userfraans[i].up, &userfraans[i].down);
}
}
}
else //当用户选择为出发时,对用户输入的答案进行保存
{
for ( i = 0; i < num; i++)
{
printf("第%d道题的答案为:", i + 1);
if (fraans[i].down == 1)
{
scanf("%d", &userfraans[i].up);
userfraans[i].down = 1;
}
else
{
scanf("%d/%d", &userfraans[i].up, &userfraans[i].down);
}
}
}
for ( i = 0; i <= num / 2; i++) //对用户输入的答案和答案进行对比,如果一致,得分+1
{
if (userans[i] == ans[i])grade++;
}
for ( i = num / 2 + 1; i < num; i++)
{
if (userfraans[i].up == fraans[i].up && userfraans[i].down == fraans[i].down)grade++;
}
printf("grade=%d\n", grade);
printf("是否继续做题?(Y/N)");
cin >> f;
if (f != 'N' && f != 'n')system("cls");
else return 0;
}
}
运行结果:
①加法运算:
②减法运算:
③乘法运算:
④除法运算:
四.个人小结
1)在软件开发中,掌握时间是一个很重要的技能,请通过psp表格做到:
a.理清开发的完整环节,争取在每个环节都有实际的工作,一开始边界不清楚是正常的,但请尝试按照自己的理解努力对应每个环节的实际工作
b.预估每个环节的时间,并真实统计这些环节的耗时,在完成后填写完整的psp耗时表
c.这些表格是给自己看的,请不要伪造数据
d.psp表格模板如下,表格里的时间只是示意
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 | 300 | 400 |
Estimate | 估计这个任务需要多少时间,并规划大致工作步骤 | 380 | 370 |
Development | 开发 | 20 | 20 |
Analysis | 需求分析(包括学习新技术) | 25 | 30 |
Design Spec | 生成设计文档 | 40 | 30 |
Design Review | 设计复审 | 40 | 35 |
Coding Standard | 代码规范 | 15 | 20 |
Design | 具体设计 | 15 | 10 |
Coding | 具体编码 | 120 | 150 |
Code Review | 代码复审 | 20 | 10 |
Test | 测试(自我测试,修改代码,提交修改) | 30 | 30 |
Reporting | 报告 | 15 | 10 |
Test Report | 测试报告 | 20 | 15 |
Size Measurement | 计算工作量 | 20 | 15 |
Postmortem & Process Improvement Plan | 事后总结,并提出过程改进计划 | 20 | 25 |
2)如果所有环节你都认真做了,那么,此处,你应该有许多经验愿意与大家分享。
通过本次作业,让我又巩固了一边C语言的知识,第一次使用博客,学到了很多。