1 import java.util.Scanner;
2 import java.util.ArrayList;
3 import java.util.Random;
4 import java.math.BigInteger;
5
6
7 public class Calculates {
8 static int n1;
9 static int n2;
10 static BigInteger n3;
11 static ArrayList<String> eq = new ArrayList<>();
12 public static void main(String[] args) {
13
14
15 Getit();
16 Makenums(n1, n2, n3);
17 error(n1);
18
19 }
20 public static void Getit(){
21 int num1,num2;
22 BigInteger num3;
23 Scanner sc = new Scanner(System.in);
24 System.out.println("请输入出题的个数:");
25 num1 = sc.nextInt();
26 System.out.println("请输入操作数的个数:");
27 num2 = sc.nextInt();
28 System.out.println("请确定操作数的范围:");
29 num3 = sc.nextBigInteger();
30 n1=num1;n2=num2;n3=num3;
31 }
32 //判重
33 public static int Judgesame(ArrayList<String> str, String s) {
34 int num = 0;
35 for (int i = 0; i < str.size(); i++) {
36 if(s.equals(str.get(i))) {
37 num++;
38 break;
39 }
40 }
41 if(num == 0) {
42 str.add(s);
43 return 1;
44 }else {
45 return 0;
46 }
47 }
48 //出题
49 public static void Makenums(int nu1,int nu2,BigInteger nu3){
50 Random rand = new Random();
51 Scanner sc = new Scanner(System.in);
52 ArrayList<String> st = new ArrayList<>();
53 double sum=0;
54
55 BigInteger []numbers = new BigInteger[nu2];
56 int []dsymbol = new int[nu2-1];
57 String []symbol = new String[nu2-1];
58
59
60 for(int i=0;i<nu1;i++){
61
62 for(int j=0;j<nu2;j++){
63 int MAX = 10;
64 byte[] b = new byte[MAX];
65 rand.nextBytes(b);
66 BigInteger bigInt = new BigInteger(b);
67 bigInt = bigInt.abs();
68 numbers[j] = bigInt;
69 }
70 for(int k=0;k<(nu2-1);k++){
71 dsymbol[k] = rand.nextInt(4);
72 switch (dsymbol[k]) {
73 case 0:
74 symbol[k] = "+";
75 break;
76 case 1:
77 symbol[k] = "-";
78 break;
79 case 2:
80 symbol[k] = "*";
81 break;
82 case 3:
83 symbol[k] = "/";
84 break;
85 }
86 }
87 StringBuffer strB = new StringBuffer();
88 for(int e=0;e<nu2;e++){
89 if(e==nu2-1){
90 strB.append(numbers[e]);
91 }else{
92 strB.append(numbers[e]).append(symbol[e]);
93 }
94 }
95 if(i==0) {
96 st.add(strB.toString());
97 System.out.println(st.get(i) + "=");
98 BigInteger answer1;
99 answer1 = sc.nextBigInteger();
100 if(Judgeanswer(numbers, symbol, answer1, n2)){
101 System.out.println("正确");
102 sum++;
103 }else{
104 System.out.println("错误");
105 eq.add(strB.toString());
106 }
107 }else {
108 int judge = Judgesame(st, strB.toString());
109 if (judge == 1) {
110
111 System.out.println(st.get(i) + "=");
112 BigInteger answer2;
113 answer2 = sc.nextBigInteger();
114 if(Judgeanswer(numbers, symbol, answer2, n2)){
115 System.out.println("正确");
116 sum++;
117 }else{
118 System.out.println("错误");
119 eq.add(strB.toString());
120 }
121 }
122 }
123
124 }
125 double correct = sum/nu1;
126 System.out.println("正确率为:"+correct);
127 }
128 //判断正误
129 public static boolean Judgeanswer(BigInteger num[],String sy[],BigInteger myanswer,int num2){
130
131 BigInteger truth=new BigInteger("0");
132 truth = truth.add(num[0]);
133 for(int e=0;e<(num2-1);e++){
134 for(int l=1;l<num2;l++){
135 if(sy[e] == "+"){
136 truth = truth.add(num[l]);
137 }
138 else if(sy[e] == "-"){
139 truth = truth.subtract(num[l]);
140 }
141 else if(sy[e] == "*"){
142 truth = truth.multiply(num[l]);
143 }
144 else if(sy[e] == "/"){
145 truth = truth.divide(num[l]);
146 }
147 }
148 }
149 if(myanswer == truth){
150 return true;
151 }
152 else{
153 return false;
154 }
155 }
156 public static void error(int nu1){
157 System.out.println("错题如下");
158 for(int i=0;i<nu1;i++){
159 System.out.println(eq.get(i) + "=");
160 }
161 }
162 }
163 这个是超大数
164 下面是精确数，实际上偷了一个懒，没有写在一个里面
165
166 import java.util.Scanner;
167 import java.util.ArrayList;
168 import java.util.Random;
169 import java.math.BigDecimal;
170
171
172
173 public class Calculate2 {
174 static int n1;
175 static int n2;
176 static BigDecimal n3;
177 static ArrayList<String> eq = new ArrayList<>();
178 public static void main(String[] args) {
179
180
181 Getit();
182 Makenums(n1, n2, n3);
183 error(n1);
184
185 }
186 public static void Getit(){
187 int num1,num2;
188 BigDecimal num3;
189 Scanner sc = new Scanner(System.in);
190 System.out.println("请输入出题的个数:");
191 num1 = sc.nextInt();
192 System.out.println("请输入操作数的个数:");
193 num2 = sc.nextInt();
194 System.out.println("请确定操作数的范围:");
195 num3 = sc.nextBigDecimal();
196 n1=num1;n2=num2;n3=num3;
197 }
198 //判重
199 public static int Judgesame(ArrayList<String> str, String s) {
200 int num = 0;
201 for (int i = 0; i < str.size(); i++) {
202 if(s.equals(str.get(i))) {
203 num++;
204 break;
205 }
206 }
207 if(num == 0) {
208 str.add(s);
209 return 1;
210 }else {
211 return 0;
212 }
213 }
214 //出题
215 public static void Makenums(int nu1,int nu2,BigDecimal nu3){
216 Random rand = new Random();
217 Scanner sc = new Scanner(System.in);
218 ArrayList<String> st = new ArrayList<>();
219 double sum=0;
220
221 BigDecimal []numbers = new BigDecimal[nu2];
222 int []dsymbol = new int[nu2-1];
223 String []symbol = new String[nu2-1];
224
225
226 for(int i=0;i<nu1;i++){
227
228 for(int j=0;j<nu2;j++){
229 float maxF = nu3.floatValue();
230 BigDecimal Int = new BigDecimal(Math.random() * (maxF - 0) + 0);
231 // BigDecimal bigInt = new BigDecimal(b);
232 // bigInt = bigInt.abs();
233 numbers[j] = Int;
234 }
235 for(int k=0;k<(nu2-1);k++){
236 dsymbol[k] = rand.nextInt(4);
237 switch (dsymbol[k]) {
238 case 0:
239 symbol[k] = "+";
240 break;
241 case 1:
242 symbol[k] = "-";
243 break;
244 case 2:
245 symbol[k] = "*";
246 break;
247 case 3:
248 symbol[k] = "/";
249 break;
250 }
251 }
252 StringBuffer strB = new StringBuffer();
253 for(int e=0;e<nu2;e++){
254 if(e==nu2-1){
255 strB.append(numbers[e]);
256 }else{
257 strB.append(numbers[e]).append(symbol[e]);
258 }
259 }
260 if(i==0) {
261 st.add(strB.toString());
262 System.out.println(st.get(i) + "=");
263 BigDecimal answer1;
264 answer1 = sc.nextBigDecimal();
265 if(Judgeanswer(numbers, symbol, answer1, n2)){
266 System.out.println("正确");
267 sum++;
268 }else{
269 System.out.println("错误");
270 eq.add(strB.toString());
271 }
272 }else {
273 int judge = Judgesame(st, strB.toString());
274 if (judge == 1) {
275
276 System.out.println(st.get(i) + "=");
277 BigDecimal answer2;
278 answer2 = sc.nextBigDecimal();
279 if(Judgeanswer(numbers, symbol, answer2, n2)){
280 System.out.println("正确");
281 sum++;
282 }else{
283 System.out.println("错误");
284 eq.add(strB.toString());
285 }
286 }
287 }
288
289 }
290 double correct = sum/nu1;
291 System.out.println("正确率为:"+correct);
292 }
293 //判断正误
294 public static boolean Judgeanswer(BigDecimal num[],String sy[],BigDecimal myanswer,int num2){
295
296 BigDecimal truth=new BigDecimal("0");
297 truth = truth.add(num[0]);
298 for(int e=0;e<(num2-1);e++){
299 for(int l=1;l<num2;l++){
300 if(sy[e] == "+"){
301 truth = truth.add(num[l]);
302 }
303 else if(sy[e] == "-"){
304 truth = truth.subtract(num[l]);
305 }
306 else if(sy[e] == "*"){
307 truth = truth.multiply(num[l]);
308 }
309 else if(sy[e] == "/"){
310 truth = truth.divide(num[l]);
311 }
312 }
313 }
314 if(myanswer == truth){
315 return true;
316 }
317 else{
318 return false;
319 }
320 }
321 public static void error(int nu1){
322 System.out.println("错题如下");
323 for(int i=0;i<nu1;i++){
324 System.out.println(eq.get(i) + "=");
325 }
326 }
327 }
