软件工程个人作业01

  1 package 四则运算;
  2 
  3 import java.util.Scanner;
  4 
  5 public class TI {
  6 
  7     public static void main(String[] args) {
  8         // TODO Auto-generated method stub
  9         Scanner in = new Scanner(System.in);
 10         System.out.println("请输入题目的数量：");
 11         int n = in.nextInt();
 12         System.out.println("请输入每行题目的数目：");
 13         int num= in.nextInt();
 14         int result[] = new int[n];
 15         int result_an[] = new int[n];
 16         String result1[] = new String[n];
 17         String result_an1[] = new String[n];
 18         //整数四则运算
 19         for(int i  = 0;i<n/2;i++){
 20         int x =1+ (int)(Math.random()*100);
 21         int y = 1+(int)(Math.random()*100);
 22         int fuhao = 1+(int)(Math.random()*4);
 23         System.out.print(i+1+": ");
 24         if(fuhao == 0)
 25         {
 26             System.out.print(x+ " + " +y+"    ");
 27             result_an[i] = in.nextInt();
 28             result[i] = x+y;
 29         }
 30         else if(fuhao == 1)
 31         {
 32             if(x<y)
 33             {
 34                 System.out.print(y+ " - " +x+"    ");
 35                 result_an[i] = in.nextInt();
 36                 result[i] = y-x;
 37             }
 38             else
 39                 {
 40                 System.out.print(x+ " - " +y+"    ");
 41                 result_an[i] = in.nextInt();
 42                 result[i] = x-y;}
 43         }
 44         else if(fuhao ==2){
 45             System.out.print(x+ " * " +y+"    ");
 46             result_an[i] = in.nextInt();
 47             result[i] = x*y;
 48         }
 49         else
 50             {
 51             System.out.print(x+ " / " +y+"    ");
 52             result_an1[i] = in.next();
 53             result1[i] = huajian(x,y);
 54             }
 55         if((i+1)%num ==0)
 56         {
 57             System.out.print("\r");
 58         }
 59         }
 60         //分数四则运算
 61         for(int i = n/2;i<n;i++)
 62         {
 63             int a =1+ (int)(Math.random()*10);
 64             int b = 1+(int)(Math.random()*10);
 65             int c = 1+(int)(Math.random()*10);
 66             int d = 1+(int)(Math.random()*10);
 67             int e;
 68             int fuhao = 1+(int)(Math.random()*4);
 69             
 70             if(a>b)
 71             {
 72                 e = a;
 73                 a = b;
 74                 b = e;
 75             }
 76             if(c>d)
 77             {
 78                 e = c;
 79                 c = d;
 80                 d = e;
 81             }
 82             String x = a+"/"+b;
 83             String y = c+"/"+d;
 84             System.out.print(i+1+": ");
 85             if(fuhao == 0)
 86             {
 87                 System.out.print(x+ " + " +y+"    ");
 88                 a = a*d+b*c;
 89                 b = b*d;
 90                 result_an1[i] = in.next();
 91                 result1[i] = huajian(a,b);
 92             }
 93             else if(fuhao == 1)
 94             {
 95                 if(a/b<c/d)
 96                 {
 97                     System.out.print(y+ " - " +x+"    ");
 98                     a = b*c-a*d;
 99                     b = b*d;
100                     result_an1[i] = in.next();
101                     result1[i] = huajian(a,b);
102                 }
103                 else
104                     System.out.print(x+ " - " +y+"    ");
105                 a = a*d-b*c;
106                 b = b*d;
107                 result_an1[i] = in.next();
108                 result1[i] = huajian(a,b);
109             }
110             else if(fuhao ==2){
111                 System.out.print(x+ " * " +y+"    ");
112                 a = a*c;
113                 b = b*d;
114                 result_an1[i] = in.next();
115                 result1[i] = huajian(a,b);
116             }
117             else{
118                 System.out.print(x+ " / " +y+"    ");
119                 a = a*d;
120                 b = b*c;
121                 result_an1[i] = in.next();
122                 result1[i] = huajian(a,b);
123             }    
124             if((i+1)%num==0)
125                 System.out.print("\r");
126         }
127         System.out.println("若做完，按1可查看答案");
128         int number = in.nextInt();
129         in.close();
130         if(number == 1){
131         for(int i= 0;i<n;i++){
132             System.out.print(i+1+":");
133             if(result1[i]!=null){
134                 if(result1[i].equals(result_an1[i]))
135                 System.out.println("正确");
136                 else
137                     System.out.println("错误，正确答案为"+result1[i]);
138                 }
139             else
140                 if(result[i]==result_an[i])
141                     System.out.println("正确");
142                 else
143                 System.out.println("错误，正确答案为"+result[i]);
144         }
145         }
146     }
147     public static String huajian(int a,int b){
148         if(a<b)
149         {
150             for(int i = a;i>0;i--){
151             if(a%i==0&&b%i==0){
152                 a/=i;
153                 b/=i;
154                 break;
155             }}
156         }
157         else{
158 
159             for(int i = b;i>0;i--){
160             if(a%i==0&&b%i==0){
161                 a/=i;
162                 b/=i;
163                 break;
164             }}
165                 
166             }
167         
168         return a+"/"+b;
169     }
170 }