package sizeyunsuan2; import java.util.Random; import java.util.Scanner; public class suan { static int sum = 0;//记录目前式子个数 static double cuoti = 0;//错题个数 static int rr = 0;//也是错题个数,因为要计算错题率所以一个double型，一个int型 public static void main(String[] args) { Scanner sc = new Scanner(System.in); System.out.println("请输入式子个数："); int shizi = sc.nextInt(); String [] arr = new String[shizi];//存运算式 double [] result = new double[shizi];//存结果 System.out.println("请输入操作数个数："); int c = sc.nextInt();//操作数个数 System.out.println("是否需要加入括号,0:不需要 1:需要"); int kuohao = sc.nextInt(); System.out.println("请输入最小的值"); int min = sc.nextInt(); System.out.println("请输入最大的值"); int max = sc.nextInt(); double [] a = new double[c]; char [] b = new char[c-1]; int []temp = new int[shizi];//错题下标 for(int i=0;i<shizi;i++)//生成式子同时判断有无相同，无则存 { String s = chuti(c,a,b,result,max,min,kuohao); while(!panduan(arr,s)) { s=chuti(c,a,b,result,max,min,kuohao); } System.out.print(s); dati(result,temp); arr[sum] = s; sum++; } gailu(shizi); cuotiji(temp,arr); System.out.println("是否需要重新计算错题,0:不需要 1:需要"); int o = sc.nextInt(); if(o==1) { System.out.println("------------------------"); chonglian(temp,arr,result); } } public static boolean panduan(String arr[],String b)//判断是否重复 { for(int i=0;i<arr.length;i++) { if(b.equals(arr[i])) { System.out.println("重复"); return false; } } return true; } public static String chuti(int c,double []a,char []b,double []result,int max,int min,int kuohao)//随机生成式子同时计算结果储存到result数组中 { String s=""; double re=0; char [] r = {'+','-','*','/'}; Random ra = new Random(); Random rb = new Random(); if(kuohao==0)//不要括号 { for(int i=0;i<c;i++) //5 { if(i<c-1) { a[i]=rb.nextInt(max-min+1)+min;//将随机整数存到a中 s+=a[i]; int t = ra.nextInt(4); b[i]=r[t];//将字符串存到b中 s+=r[t]; }else { a[i]=ra.nextInt(max-min+1)+min; s+=a[i]; } } //12+45/4*3 a[]={12,45,4,3} b[]={+,/,*} for(int i=0;i<b.length;i++)//i<7 { if(b[i]=='*') { a[i+1]=a[i]*a[i+1]; a[i]=0; } if(b[i]=='/') { a[i+1]=a[i]/a[i+1]; a[i]=0; } if(b[i]=='-')//1+2-3 { a[i+1]=-a[i+1]; } } for(int i=0;i<a.length;i++) { re+=a[i]; } result[sum]=re; }else//需要括号 { int zuokuo = ra.nextInt(c-1); int youkuo = ra.nextInt(c-zuokuo-1) + zuokuo + 1; for(int i=0;i<c;i++) //5 { if(i<c-1) { if(zuokuo==i) s+='('; a[i]=rb.nextInt(max-min+1)+min;//将随机整数存到a中 s+=a[i]; int t = ra.nextInt(4); b[i]=r[t];//将字符串存到b中 if(youkuo==i) s+=')'; s+=r[t]; }else { a[i]=ra.nextInt(max-min+1)+min; s+=a[i]; if(youkuo==i) s+=')'; } } //12+45/4*3 a[]={12,45,4,3} b[]={+,/,*} for(int j=zuokuo;j<youkuo;j++)//计算括号里的值 { if(b[j]=='*') { a[j+1]=a[j]*a[j+1]; a[j]=0; } if(b[j]=='/') { a[j+1]=a[j]/a[j+1]; a[j]=0; } if(b[j]=='-')//1+2-3 { a[j+1]=-a[j+1]; } } for(int j=zuokuo;j<=youkuo;j++) { re+=a[j]; } a[zuokuo] = re;//括号内计算结果 double[] temp = new double[c - (youkuo - zuokuo)];//存去掉括号后的操作数 char[] tempB = new char[c - (youkuo - zuokuo) - 1];//存括号外的操作符 temp[zuokuo] = re; if (youkuo != c - 1) { tempB[zuokuo] = b[youkuo]; } for (int i = 0; i < zuokuo; i++) { temp[i] = a[i]; tempB[i] = b[i]; } for (int i = youkuo + 1, index = zuokuo + 1; i < c; i++, index++) { temp[index] = a[i]; } for (int i =youkuo + 1, index = zuokuo + 1; i < c - 1; i++, index++) { tempB[index] = b[i]; } //继续计算 for (int j = 0; j < c - (youkuo-zuokuo) - 1; j++) { if (tempB[j] == '-') { temp[j + 1] = -temp[j + 1]; } if (tempB[j] == '*') { temp[j + 1] = temp[j] * temp[j + 1]; temp[j] = 0; } if (tempB[j] == '/') { temp[j + 1] = temp[j] / temp[j + 1]; temp[j] = 0; } } re = 0; for (int j = 0; j < c - (youkuo-zuokuo); j++) { re += temp[j]; } result[sum]=re; } s+="="; return s; } public static void dati(double []result,int []temp)//答题 { Scanner sc = new Scanner(System.in); double t = sc.nextDouble();//输入你的答案 if(t!=result[sum]) { cuoti++; temp[rr] = sum; rr++; System.out.println("答案错误"); }else { System.out.println("答案正确"); } } public static void gailu(int shizi) { double p = (cuoti/shizi)*100; System.out.print("你的错误率为："); System.out.printf("%.2f",p); System.out.println("%"); } public static void cuotiji(int []temp,String []arr) { System.out.println("你的错题集如下："); for(int i=0;i<rr;i++) { System.out.println(arr[temp[i]]); } } public static void chonglian(int []temp,String []arr,double []result) { Scanner sc = new Scanner(System.in); for(int i=0;i<rr;i++) { System.out.print(arr[temp[i]]); double t = sc.nextDouble(); if(t==result[temp[i]]) System.out.println("再次计算正确"); else System.out.println("再次计算错误"); } } }
今天重新调试了算法四则运算
