第四次作业:个人项目-小学四则运算 “软件”之初版
本次作业的要求来自于:https://edu.cnblogs.com/campus/gzcc/GZCC-16SE2/homework/2186
本次作业代码的github地址:https://github.com/FreyjaFs/operation.git
第一部分:设计思路
- 首先很容易想到四则运算是由数字和运算符组成,设置一个二维数组存储题号及相应的运算符与数字。数字和运算符分别用数组存储,然后读取用valueof方法直接计算出答案。
第二部分:详细要求
1) 要求能出和真分数 (二分之一, 十二分之五,等)相关的练习题。
2) 并且要求能处理用户的输入,并判断对错,打分统计。 要求能处理用户输入的真分数, 如 1/2, 5/12 等
第三部分:主要设计
开发工具:idea
编程语言:java
主要分为三大板块:
(1)主函数
(2)生成数字和符号
(3)生成答案
(4)反馈模块
第四部分:主要设计
public static void ramNum() {
for (int jnum = 0; jnum < 3; jnum++) {
int randomNum = (int) (1 + Math.random() * 100);
number[jnum] = randomNum;
}
for (int jop = 0; jop < 2; jop++) {
int randomop = (int) (Math.random() * 4);
operate[jop] = randomop;
}
}
//随机生成符号
public static String radomOs(int rOs) {
if (rOs== 0) {
return "+";
}
if (rOs == 1) {
return "-";
}
if (rOs == 2) {
return "*";
}
if (rOs == 3) {
return "/";
}
return "";
}
//四则运算。
public static double operation(int opNum, double a, double b) {
if (opNum == 0) {
return a + b;
}
if (opNum == 1) {
return a - b;
}
if (opNum == 2) {
return a * b;
}
if (opNum == 3) {
return a / b;
}
return 0;
}
//得出运算结果。
public static double getResult() {
//利用valueOf方法直接计算式子
if (operate[1] < 2) {
double result = operation(operate[0], number[0], number[1]);
result = operation(operate[1], result, number[2]);
result=Double.valueOf(result);
return result;
}
else {
double result = operation(operate[1], number[1], number[2]);
result = operation(operate[0], number[0], result);
result=Double.valueOf(result);
return result;
}
}
//生成题目
public static void inttopic(int Onum){
double score=0;
for(int i=0;i< Onum;i++){
int cnum=i+1;
ramNum();
for (int jnum = 0; jnum < 3; jnum++) {
//topic[i][j]i为题号,j储存题目
topic[i][2 * jnum] = String.valueOf(number[jnum]);
}
for (int jop = 0; jop < 2; jop++) {
topic[i][2 * jop + 1] = radomOs(operate[jop]);
}
topic[i][5] = "=";
//
topic[i][6] = String.valueOf(getResult());
if(getResult()>0) {
int j = 0;
System.out.print("("+cnum+")");
for (j = 0; j < 5; j++) {
System.out.print(topic[i][j]);
}
System.out.print(topic[i][5]);
Scanner in = new Scanner(System.in);
double inputNum = in.nextDouble();
if (!topic[i][6].equals(String.valueOf(inputNum))) {
System.out.println("答错了!");
} else {
score =score +100 / Onum ;
}
}else {i--;}
}
System.out.println("您的总分是"+score+"分。(每小题"+ (100/Onum)+"分,总分100分)");
}
for (int jnum = 0; jnum < 3; jnum++) {
int randomNum = (int) (1 + Math.random() * 100);
number[jnum] = randomNum;
}
for (int jop = 0; jop < 2; jop++) {
int randomop = (int) (Math.random() * 4);
operate[jop] = randomop;
}
}
//随机生成符号
public static String radomOs(int rOs) {
if (rOs== 0) {
return "+";
}
if (rOs == 1) {
return "-";
}
if (rOs == 2) {
return "*";
}
if (rOs == 3) {
return "/";
}
return "";
}
//四则运算。
public static double operation(int opNum, double a, double b) {
if (opNum == 0) {
return a + b;
}
if (opNum == 1) {
return a - b;
}
if (opNum == 2) {
return a * b;
}
if (opNum == 3) {
return a / b;
}
return 0;
}
//得出运算结果。
public static double getResult() {
//利用valueOf方法直接计算式子
if (operate[1] < 2) {
double result = operation(operate[0], number[0], number[1]);
result = operation(operate[1], result, number[2]);
result=Double.valueOf(result);
return result;
}
else {
double result = operation(operate[1], number[1], number[2]);
result = operation(operate[0], number[0], result);
result=Double.valueOf(result);
return result;
}
}
//生成题目
public static void inttopic(int Onum){
double score=0;
for(int i=0;i< Onum;i++){
int cnum=i+1;
ramNum();
for (int jnum = 0; jnum < 3; jnum++) {
//topic[i][j]i为题号,j储存题目
topic[i][2 * jnum] = String.valueOf(number[jnum]);
}
for (int jop = 0; jop < 2; jop++) {
topic[i][2 * jop + 1] = radomOs(operate[jop]);
}
topic[i][5] = "=";
//
topic[i][6] = String.valueOf(getResult());
if(getResult()>0) {
int j = 0;
System.out.print("("+cnum+")");
for (j = 0; j < 5; j++) {
System.out.print(topic[i][j]);
}
System.out.print(topic[i][5]);
Scanner in = new Scanner(System.in);
double inputNum = in.nextDouble();
if (!topic[i][6].equals(String.valueOf(inputNum))) {
System.out.println("答错了!");
} else {
score =score +100 / Onum ;
}
}else {i--;}
}
System.out.println("您的总分是"+score+"分。(每小题"+ (100/Onum)+"分,总分100分)");
}
运行截图
第五部分:时间预计
PSP2.1 | Personal Software Process Stages | Time Senior Student | Time |
Planning | 计划 | 8 | 6 |
· Estimate | 估计这个任务需要多少时间 | 8 | 6 |
Development | 开发 | 99 | 90 |
· Analysis | 需求分析 (包括学习新技术) | 6 | 10 |
· Design Spec | 生成设计文档 | 5 | 6 |
· Design Review | 设计复审 | 4 | 6 |
· Coding Standard | 代码规范 | 3 | 3 |
· Design | 具体设计 | 10 | 12 |
· Coding | 具体编码 | 36 | 21 |
· Code Review | 代码复审 | 7 | 9 |
· Test | 测试(自我测试,修改代码,提交修改) | 5 | 4 |
Reporting | 报告 | 9 | 6 |
· | 测试报告 | 3 | 2 |
· | 计算工作量 | 2 | 1 |
· | 并提出过程改进计划 |