个人作业1——四则运算题目生成程序
四则运算题目生成程序
需求分析：
1.除了整数以外，还要支持真分数的四则运算，真分数的运算，例如：1/6 + 1/8 = 7/24
2.运算符为 +, −, ×, ÷
3.要求能处理用户的输入，并判断对错，打分统计正确率。
4.要求能处理用户输入的真分数， 如 1/2, 5/12 等
5.使用 -n 参数控制生成题目的个数，例如执行下面命令将生成10个题目
Myapp.exe -n 10
设计实现：
1.使用if条件判断，选择进行整式运算还是分式运算
2.获取随机运算符号与随机数
3.分别编写整式运算函数与分式运算函数
4.分别计算正确率
代码说明：
#pragma warning(disable:4996) #include<stdio.h> #include<stdlib.h> #include<time.h> #include<windows.h> #include<string.h> using namespace std; #define OPERATOR 4 //获取随机运算符 char getopre() { char oper[OPERATOR] = { '+','-','*','/' }; srand((unsigned)time(NULL)); return oper[rand() % 4]; } //获取随机数 int random(double start, double end) { return (int)(start + (end - start)*rand() / (RAND_MAX + 1.0)); } //列式子 void equation() { int num1; int num2; int result; int answer; char oper; int right=0; float accuracy; int i, n; printf("请输入要生成的式子数："); scanf("%d", &n); for (i = 0; i < n; i++) { srand((unsigned)time(NULL)); oper = getopre(); num1 = random(0, 20); num2 = random(1, 20); switch (oper) { case '+': result = num1 + num2; printf("%d+%d=\n", num1, num2); break; case '-': result = num1 - num2; printf("%d-%d=\n", num1, num2); break; case '*': result = num1*num2; printf("%d*%d=\n", num1, num2); break; case '/': num1 = num1*num2; result = num1 / num2; printf("%d÷%d=\n", num1, num2); break; } //printf("%d%c%d=\n", num1, oper, num2); printf("请输入你的答案："); scanf("%d", &answer); if (result==answer) { printf("恭喜你答对了\n\n"); right++; } else { printf("对不起答错了\n"); printf("正确答案为：%d\n\n", result); } } accuracy = ((float)right /(float) n)*100; printf("正确率为百分之%1.2f\n", accuracy); } //真分数列式 void fraction() { int num1; int num2; int num3; int num4; int a, b; int answer1, answer2; float result; float answer; char oper; int right = 0; float accuracy; int i, n; printf("请输入要生成的式子数："); scanf("%d", &n); for (i = 0; i < n; i++) { srand((unsigned)time(NULL)); oper = getopre(); num1 = random(0, 20); num2 = random(1, 20); num3 = random(0, 20); num4 = random(1, 20); switch (oper) { case '+': a = num1*num4+num3*num2; b = num2*num4; result = (float)a / (float)b; printf("%d/%d+%d/%d=\n", num1, num2, num3, num4); break; case '-': a = num1*num4 - num3*num2; b = num2*num4; result = (float)a / (float)b; printf("%d/%d-%d/%d=\n", num1, num2, num3, num4); break; case '*': a = num1*num3; b = num2*num4; result = (float)a / (float)b; printf("%d/%d*%d/%d=\n", num1, num2,num3, num4); break; case '/': a = num1*num4; b = num2*num3; result =(float) a /(float) b; printf("%d/%d÷%d/%d=\n", num1, num2, num3, num4); break; } printf("请输入你的答案：\n"); scanf("%d", &answer1); printf("/\n"); scanf("%d", &answer2); answer = (float)answer1 / (float)answer2; if (result==answer) { printf("恭喜你答对了\n\n"); right++; } else { printf("对不起答错了\n"); printf("正确答案为：%d/%d\n\n", a,b); } } accuracy = ((float)right / (float)n) * 100; printf("正确率为百分之%1.2f\n", accuracy); } //主函数 void main() { int choose; printf("输入1生成整数算式，其他生成分式算式："); scanf("%d", &choose); if (choose == 1) { equation(); } else { fraction(); } }
测试运行：
psp：
|
PSP2.1 |
Personal Software Process Stages |
Time (%) Senior Student(/hour) |
Time (%)(/hour) |
|
· Planning |
计划 |
3 |
4.5 |
|
· Estimate |
估计这个任务需要多少时间 |
4 |
4.5 |
|
· Analysis |
需求分析 (包括学习新技术) |
1 |
0.5 |
|
· Coding Standard |
代码规范 |
0.2 |
0.2 |
|
· Design |
具体设计 |
1 |
0.5 |
|
· Coding |
具体编码 |
1.5 |
2 |
|
· Test |
测试（自我测试，修改代码，提交修改） |
0.5 |
1 |
|
Reporting |
报告 |
0.5 |
0.5 |
实验小结：本次实验的知识之前都学习过，但是还是不熟悉，编写函数的时候有很多小问题，还需要多加练习。
码市地址：https://coding.net/u/ltt979/p/zuoye1/git/tree/master
