标签：ati 表达 tin try generate warning tst swa void
达到输入文件，按运算符读取文件和按行输出
第一部分 出题运算和导入文件
package test3; import java.io.File; import java.io.FileWriter; import java.io.IOException; import java.io.PrintWriter; import java.util.Random; import java.util.Scanner; public abstract class text { public static void main(String[] args) { // TODO Auto-generated method stub @SuppressWarnings("resource") Scanner x=new Scanner(System.in); System.out.print("请输入一个整数："); int number=x.nextInt(); int writer=0; try { //如果文件存在，则追加内容；如果文件不存在，则创建文件 File file = new File("d://test.txt"); FileWriter fw = new FileWriter(file, true); PrintWriter pw = new PrintWriter(fw); if(writer==0) { pw.println("20173517"); writer=1; } System.out.println("20173517"); for(int i=1;i<=number;i++) { //随机生成数 Random rd=new Random(); int data1=rd.nextInt(100)+1; int data2=rd.nextInt(100)+1; int data3=rd.nextInt(100)+1; //随机生成运算符 String[] operator={"*","/","+","-"}; Random r=new Random(); int num1=r.nextInt(4); int num2=r.nextInt(4); String str=data1+operator[num1]+data2+operator[num2]+data3; //System.out.println(str); int result; if(operator[num1]=="+") { if(operator[num2]=="+") { result=data1+data2+data3; System.out.println(str+"="+"*"); System.out.println(result); pw.println(str+"="+"*"); pw.println(result); } else if(operator[num2]=="-") { if(data1+data2>=data3) { result=data1+data2-data3; System.out.println(str+"="+"*"); System.out.println(result); pw.println(str+"="+"*"); pw.println(result); } else{ number++; } } else if(operator[num2]=="*") { result=data1+data2*data3; System.out.println(str+"="+"*"); System.out.println(result); pw.println(str+"="+"*"); pw.println(result); } else { if(data2%data3==0 && data3!=0) { result=data1+data2/data3; System.out.println(str+"="+"*"); System.out.println(result); pw.println(str+"="+"*"); pw.println(result); } else{ number++; } } } else if(operator[num1]=="-") { if(operator[num2]=="+") { if(data1>=data2) { result=data1-data2+data3; System.out.println(str+"="+"*"); System.out.println(result); pw.println(str+"="+"*"); pw.println(result); } else{ number++; } } else if(operator[num2]=="-") { if(data1>=data2) { if(data1-data2>=data3) { result=data1-data2-data3; System.out.println(str+"="+"*"); System.out.println(result); pw.println(str+"="+"*"); pw.println(result); } else{ number++; } } else{ number++; } } else if(operator[num2]=="*") { if(data1>=data2*data3) { result=data1-data2*data3; System.out.println(str+"="+"*"); System.out.println(result); pw.println(str+"="+"*"); pw.println(result); } else{ number++; } } else{ if(data2%data3==0 && data3!=0) { if(data1>=data2/data3) { result=data1-data2/data3; System.out.println(str+"="+"*"); System.out.println(result); pw.println(str+"="+"*"); pw.println(result); } else{ number++; } } else{ number++; } } } else if(operator[num1]=="*") { if(operator[num2]=="+") { result=data1*data2+data3; System.out.println(str+"="+"*"); System.out.println(result); pw.println(str+"="+"*"); pw.println(result); } else if(operator[num2]=="-"){ if(data1*data2>=data3) { result=data1*data2-data3; System.out.println(str+"="+"*"); System.out.println(result); pw.println(str+"="+"*"); pw.println(result); } else{ number++; } } else if(operator[num2]=="*") { result=data1*data2*data3; System.out.println(str+"="+"*"); System.out.println(result); pw.println(str+"="+"*"); pw.println(result); } else{ int result1=data1*data2; if(result1%data3==0 && data3!=0) { result=data1*data2/data3; System.out.println(str+"="+"*"); System.out.println(result); pw.println(str+"="+"*"); pw.println(result); } else{ number++; } } } //第一个运算符为“/” else{ if(data1%data2==0 && data2!=0)//判断data1能否被data2整除,且除数data2不能为0 { if(operator[num2]=="+")//乘除的优先级高于加减，所以可以顺着往下计算 { result=data1/data2+data3; System.out.println(str+"="+"*"); System.out.println(result); pw.println(str+"="+"*"); pw.println(result); } else if(operator[num2]=="-") { if(data1/data2>=data3)//判断data1/data2的商是否大于data3 { result=data1/data2-data3; System.out.println(str+"="+"*"); System.out.println(result); pw.println(str+"="+"*"); pw.println(result); } else{ number++;//不符合条件就将表达式的个数加1，进行下一个表达式的计算 } } else if(operator[num2]=="*") { result=data1/data2*data3; System.out.println(str+"="+"*"); System.out.println(result); pw.println(str+"="+"*"); pw.println(result); } else{ int result1=data1/data2; if(result1%data3==0 && data3!=0) //判断data1/data2的商能否整除data3，且data3不能为0 { result=data1/data2/data3; System.out.println(str+"="+"*"); System.out.println(result); pw.println(str+"="+"*"); pw.println(result); } else{ number++; } } } else{ number++; } } } pw.flush(); pw.close(); fw.close(); } catch (IOException e1) { e1.printStackTrace(); } } }
第二部分 按行读取：
package test3; import java.io.*; public class date { File file=new File("D:\\test.txt"); public BufferedReader reader=null; public String temp=null; public int line=1; {try{ reader=new BufferedReader(new FileReader(file)); while((temp=reader.readLine())!=null){ System.out.println(temp); line=line+2; } } catch(Exception e){ e.printStackTrace(); } finally{ if(reader!=null){ try{ reader.close(); } catch(Exception e){ e.printStackTrace(); } } } }}
第三部分 验证答案，运算得分
package test3; import java.io.BufferedReader; import java.io.FileReader; import java.util.Scanner; public class Yanz { public static int rightAnswer=0; date d=new date(); public String b=d.temp; static int i=0; { try{ BufferedReader br = new BufferedReader(new FileReader("test.txt")); String line = ""; while((line = br.readLine()) != null){ if(line.charAt(0)==‘*‘){ System.out.println("请输入答案"); String putAnswer = new Scanner(System.in).nextLine(); if(putAnswer.equals(b)){ rightAnswer++; } i++; } else{ System.out.println(line); } } System.out.println("总共答对"+rightAnswer+"道题，得分是"+rightAnswer*25); br.close();} catch(Exception e){ System.out.println(e.toString()); }; } }
标签：ati 表达 tin try generate warning tst swa void
原文地址：https://www.cnblogs.com/zjm15511858030/p/9966652.html
