作业一
简易四则运算结果
package calc;
/*支持分数和随机长度，并可以将每次答题情况记录到文件里 */
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.PrintStream;
import java.util.Date;
import java.util.Scanner;
public class Question {
public static String str = "";//题目
public static int num = 4;//每题中数的个数
public static int num_i = 0;//题目中已有数的个数
public static int numberRange = 20;//运算中数的最大取值
public static number sum = new number();//结果
public static void main(String[] args) {
System.out.println();
System.out.println("Please finish the following 25 questions!");
System.out.println("Note: don't seperate your answer with space, ");
System.out.println("or you will be considered wrong!");
System.out.println();
Scanner input=new Scanner(System.in);
String file="out.txt";
int right=0;
PrintStream out = null;
if(args.length>=1)
file=args[0];
try {
out=new PrintStream(new FileOutputStream(file));
} catch (FileNotFoundException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
input.close();
return ;
}
out.println("\n\n"+new Date()+"\n\n");
for (int i = 0; i < 25; i++) {
GetQuestion();
System.out.print(i+1);
System.out.print(". " + str +"\nYour answer: ");
String answer="";
try{
answer=input.nextLine();
}catch(Exception e){
}
System.out.print("true answer: "+sum.toString()+" ");
number re=sum.add(new number(10));
try{
re=new number(answer);
if(re.equals(sum))
{
System.out.println("You are right!");
right=right+1;
}else {
System.out.println("You are wrong!");
}
}catch(Exception e){
if(answer.indexOf('.')!=-1)
{
try{
double ant=Double.parseDouble(answer);
if(Math.abs(ant-sum.ParseDouble())<1e-5)
{
System.out.println("You are right!");
right=right+1;
}else {
System.out.println("You are wrong!");
}
}catch(Exception ex){
System.out.println("You are wrong!");
}
}else{
System.out.println("You are wrong!");
}
}
out.print(i+1);
out.println(". " + str );
out.println("Your answer: "+answer);
out.println("True answer: "+sum.toString());
}
System.out.println(right+" / 25, So your accuracy is "+right/25.0);
out.println(right+" / 25, So your accuracy is "+right/25.0);
out.println();
input.close();
out.close();
System.out.println();
}
private static void GetQuestion() {
str = "";
sum.set(0);;
num_i = (int) (Math.random()*3)+3;
quesGrow();
}
private static void quesGrow() {
if( num_i > 1 ) {
int j = num_i;
num_i--;
quesGrow();
int ck=(int)(Math.random()*4);
number w;
if(ck!=0)
w=new number(1+(int)(Math.random()*numberRange));
else w=new number(1+(int)(Math.random()*numberRange),1+(int)(Math.random()*numberRange));
int t=(int)(Math.random()*2);
int f=(int)(Math.random()*4);
if(t == 0)
{
if( f == 0 ) {
sum = sum.add(w);
str = str + "+" + w.toString();
}
if( f == 1 ) {
sum = sum.sub(w);
str = str + "-" +w.toString();
}
if( f == 2 ) {
if( j < 3 ) {
sum = sum.mul(w);
str = str + "*" + w.toString();
}
else {
sum = sum.mul(w);
str = "(" +str+ ")" + "*" + w.toString();
}
}
if ( f == 3 ) {
if( j < 3 ) {
sum = sum.div(w);
str = str + " / " + w.toString();
}
else {
sum = sum.div(w);
str = "(" +str+ ")" + " / " + w.toString();
}
}
}
else
{
if( f == 0 ) {
sum = sum.add(w);
str = w.toString() + "+" + str;
}
if( f == 1 ) {
if( j < 3 ) {
sum = w.sub(sum);
str = w.toString() + "-" + str;
}
else {
sum = w.sub(sum);
str = w.toString() + "-" + "(" +str+ ")";
}
}
if( f == 2 ) {
if( j < 3 ) {
sum = sum.mul(w);
str = w.toString()+ "*" + str;
}
else {
sum = sum.mul(w);
str = w.toString() + "*" + "(" +str+ ")";
}
}
if( f == 3) {
if( j < 3 ) {
sum = w.div(sum);
str = w.toString() + " / " + str;
}
else {
sum = w.div(sum);
str = w.toString()+ " / " + "(" +str+ ")";
}
}
}
}
else if( num_i == 1 ) {
int ck=(int)(Math.random()*4);
number w;
if(ck!=0)
w=new number(1+(int)(Math.random()*numberRange));
else w=new number(1+(int)(Math.random()*numberRange),1+(int)(Math.random()*numberRange));
sum = sum.add(w);
str = str + w.toString();
}
}
}
运行结果
总结
没有能够写出筛选年级的代码，用代码编辑出了简单的加减乘除运算，复合运算也可以计算，遇到的困难非常多，还是在百度搜索到的结果才解决了问题，下面会进一步解决问题
作业二
gitee链接
https://gitee.com/chen_gang11/learngit/blob/master/daima.txt
总结
这个git过程些许繁琐，做的时候很生疏，遇到很多不会的过程，但是看教程最后一一解决了。