四则运算课堂测试三

要求：

 代码示例：

import java.util.Random;
import java.util.Scanner;

import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
import javax.script.ScriptException;

public class Test1to3 {

public static double eval(String str) {

ScriptEngineManager manager = new ScriptEngineManager();
ScriptEngine se = manager.getEngineByName("js");
Double result = null;

try {
result = Double.valueOf(se.eval(str).toString());
if (result == null) {
result = new Double(0);
}
} catch (ScriptException e) {
e.printStackTrace();
}
return result;
}

public static void exercise(int grade,int num1,int num2) {//num1为出题个数，num2为操作数数值范围
if(grade==2) {
int n1;
int n2;
int i,j,rightnum=0,i1=0,i2=0,i3=0,i4=0,choice;
char c;
double sum,accurary;
int number1[]=new int[100];
int number2[]=new int[100];
int number3[]=new int[100];
int number4[]=new int[100];
int number5[]=new int[100];
int number6[]=new int[100];
int number7[]=new int[100];
int number8[]=new int[100];
char[] operator=new char[]{‘+‘,‘-‘,‘*‘,‘/‘};
Random rand = new Random();
for(i=1;i<=num1;i++) {
j=rand.nextInt(4);
c=operator[j];
do {
n1=rand.nextInt(num2);
n2=rand.nextInt(num2);
}while(n1==0&&n2==0);
if(c==‘+‘) {
int result;
sum=n1+n2;
System.out.print("第"+i+"道题为：");
System.out.println(n1+"+"+n2+"=");
System.out.println("请输入计算结果：");
Scanner sc=new Scanner(System.in);
result=sc.nextInt();
System.out.println("答题结果为："+n1+"+"+n2+"="+result);
if(result==sum) {
rightnum+=1;
}
else {
i1+=1;
number1[i1]=n1;
number2[i1]=n2;
}
}
else if(c==‘-‘) {
int result;
sum=n1-n2;
System.out.print("第"+i+"道题为：");
System.out.println(n1+"-"+n2+"=");
System.out.println("请输入计算结果：");
Scanner sc=new Scanner(System.in);
result=sc.nextInt();
System.out.println("答题结果为："+n1+"-"+n2+"="+result);
if(result==sum) {
rightnum+=1;
}
else {
i2+=1;
number3[i2]=n1;
number4[i2]=n2;
}
}
else if(c==‘*‘) {
int result;
sum=n1*n2;
System.out.print("第"+i+"道题为：");
System.out.println(n1+"*"+n2+"=");
System.out.println("请输入计算结果：");
Scanner sc=new Scanner(System.in);
result=sc.nextInt();
System.out.println("答题结果为："+n1+"*"+n2+"="+result);
if(result==sum) {
rightnum+=1;
}
else {
i3+=1;
number5[i3]=n1;
number6[i3]=n2;
}
}
else if(c==‘/‘) {
int result;
if(n1%n2!=0) {
do {
n1=rand.nextInt(num2);
n2=rand.nextInt(num2);
}while(n1%n2!=0);
}
sum=(double)n1/(double)n2;
System.out.print("第"+i+"道题为：");
System.out.println(n1+"/"+n2+"=");
System.out.println("请输入计算结果：");
Scanner sc=new Scanner(System.in);
result=sc.nextInt();
System.out.println("答题结果为："+n1+"/"+n2+"="+result);
if(result==sum) {
rightnum+=1;
}
else {
i4+=1;
number7[i4]=n1;
number8[i4]=n2;
}
}
}
accurary=(double)rightnum/num1;
System.out.println("您的正确率为："+accurary*100+"%");
System.out.println("您的错题集为：");
for(i=1;i<=i1;i++) {
System.out.println(number1[i]+"+"+number2[i]+"=");
}
for(i=1;i<=i2;i++) {
System.out.println(number3[i]+"-"+number4[i]+"=");
}
for(i=1;i<=i3;i++) {
System.out.println(number5[i]+"*"+number6[i]+"=");
}
for(i=1;i<=i4;i++) {
System.out.println(number7[i]+"/"+number8[i]+"=");
}
do {
System.out.println("错题重练请按1，结束练习请按0：");
Scanner in=new Scanner(System.in);
choice=in.nextInt();
if(choice==1) {
for(i=1;i<=i1;i++) {
double result;
int wrongnum=1;
System.out.println(number1[i]+"+"+number2[i]+"=");
sum=number1[i]+number2[i];
System.out.println("请输入计算结果：");
result=in.nextDouble();
System.out.println("答题结果为："+number1[i]+"+"+number2[i]+"="+result);
if(result!=sum) {
wrongnum+=1;
System.out.println("回答错误，该题错误次数为"+wrongnum);
}
else {
System.out.println("回答正确，本题错误次数为："+wrongnum);
}
}
for(i=1;i<=i2;i++) {
double result;
int wrongnum=1;
System.out.println(number3[i]+"-"+number4[i]+"=");
sum=number3[i]-number4[i];
System.out.println("请输入计算结果：");
result=in.nextDouble();
System.out.println("答题结果为："+number3[i]+"-"+number4[i]+"="+result);
if(result!=sum) {
wrongnum+=1;
System.out.println("回答错误，该题错误次数为"+wrongnum);
}
else {
System.out.println("回答正确，本题错误次数为："+wrongnum);
}
}
for(i=1;i<=i3;i++) {
double result;
int wrongnum=1;
System.out.println(number5[i]+"*"+number6[i]+"=");
sum=number5[i]*number6[i];
System.out.println("请输入计算结果：");
result=in.nextDouble();
System.out.println("答题结果为："+number5[i]+"*"+number6[i]+"="+result);
if(result!=sum) {
wrongnum+=1;
System.out.println("回答错误，该题错误次数为"+wrongnum);
}
else {
System.out.println("回答正确，本题错误次数为："+wrongnum);
}
}
for(i=1;i<=i4;i++) {
double result;
int wrongnum=1;
System.out.println(number7[i]+"/"+number8[i]+"=");
sum=(double)number7[i]/(double)number8[i];
System.out.println("请输入计算结果：");
result=in.nextDouble();
System.out.println("答题结果为："+number7[i]+"/"+number8[i]+"="+result);
if(result!=sum) {
wrongnum+=1;
System.out.println("回答错误，该题错误次数为"+wrongnum);
}
else {
System.out.println("回答正确，本题错误次数为："+wrongnum);
}
}
}
}while(choice==1);
}
if(grade==3) {
int num,n1,n2,n3,n4,i,j,k,l,wrongnum=0,choice;
char operator1,operator2,operator3;
char[] operator=new char[]{‘+‘,‘-‘,‘*‘,‘/‘};
String[] wrong=new String[100];
String[] couts=new String[100];
double[] sum=new double[100];
Scanner sc=new Scanner(System.in);
Random rand=new Random();
System.out.println("请输入操作数个数：");
num=sc.nextInt();
if(num==3) {
for(i=1;i<=num1;i++) {
int result;
n1=rand.nextInt(num2);
n2=rand.nextInt(num2);
n3=rand.nextInt(num2);
j=rand.nextInt(4);
k=rand.nextInt(4);
operator1=operator[j];
operator2=operator[k];
String s1 = String.valueOf(n1);//将数字n1转换为字符串s1
String s2 = String.valueOf(n2);//将数字n2转换为字符串s2
String s3 = String.valueOf(n3);//将数字n3转换为字符串s3
String s4 = String.valueOf(operator1);//将字符operator1转换为字符串s4
String s5 = String.valueOf(operator2);//将字符operator2转换为字符串s5
String s6 ="=";
String cout=s1+s4+s2+s5+s3+s6;
couts[i]=s1+s4+s2+s5+s3;
System.out.println(cout);
sum[i]=eval(couts[i]);
result=sc.nextInt();
if(result!=sum[i]) {
wrong[wrongnum]=cout;
wrongnum+=1;
}
}
System.out.println("您的错题集为：");
for(i=0;i<wrongnum;i++) {
System.out.println(wrong[i]);
}
do {
System.out.println("错题重练请按1，退出请按0");
choice=sc.nextInt();
if(choice==1) {
int result;
for(i=0;i<wrongnum;i++) {
int wrongn=1;//记录错误次数
System.out.println(wrong[i]);
result=sc.nextInt();
if(result==sum[i+1]) {
System.out.println("回答正确，该题错误次数为"+wrongn);
}
else {
wrongn+=1;
System.out.println("回答错误，该题错误次数为"+wrongn);
}
}
}
}while(choice==1);
}
if(num==4) {
for(i=1;i<=num1;i++) {
int result;
n1=rand.nextInt(num2);
n2=rand.nextInt(num2);
n3=rand.nextInt(num2);
n4=rand.nextInt(num2);
j=rand.nextInt(4);
k=rand.nextInt(4);
l=rand.nextInt(4);
operator1=operator[j];
operator2=operator[k];
operator3=operator[l];
String s1 = String.valueOf(n1);//将数字n1转换为字符串s1
String s2 = String.valueOf(n2);//将数字n2转换为字符串s2
String s3 = String.valueOf(n3);//将数字n3转换为字符串s3
String s4 = String.valueOf(n3);//将数字n4转换为字符串s4
String s5 = String.valueOf(operator1);//将字符operator1转换为字符串s4
String s6 = String.valueOf(operator2);//将字符operator2转换为字符串s5
String s7 = String.valueOf(operator3);//将字符operator2转换为字符串s5
String s8 ="=";
String cout=s1+s5+s2+s6+s3+s7+s4+s8;
couts[i]=s1+s5+s2+s6+s3+s7+s4;
System.out.println(cout);
sum[i]=eval(couts[i]);
result=sc.nextInt();
if(result!=sum[i]) {
wrong[wrongnum]=cout;
wrongnum+=1;
}
}
System.out.println("您的错题集为：");
for(i=0;i<wrongnum;i++) {
System.out.println(wrong[i]);
}
do {
System.out.println("错题重练请按1，退出请按0");
choice=sc.nextInt();
if(choice==1) {
int result;
for(i=0;i<wrongnum;i++) {
int wrongn=1;//记录错误次数
System.out.println(wrong[i]);
result=sc.nextInt();
if(result==sum[i+1]) {
System.out.println("回答正确，该题错误次数为"+wrongn);
}
else {
wrongn+=1;
System.out.println("回答错误，该题错误次数为"+wrongn);
}
}
}
}while(choice==1);
}
}
if(grade==4) {//四年级题目
int num,n1,n2,n3,n4,n5,i,j,k,l,m,wrongnum=0,choice;
char operator1,operator2,operator3,operator4;
char[] operator=new char[]{‘+‘,‘-‘,‘*‘,‘/‘};
String[] wrong=new String[100];
String[] couts=new String[100];
double[] sum=new double[100];
Scanner sc=new Scanner(System.in);
Random rand=new Random();
System.out.println("请输入操作数个数：");
num=sc.nextInt();
if(num==3) {
for(i=1;i<=num1;i++) {
int result;
n1=rand.nextInt(num2);
n2=rand.nextInt(num2);
n3=rand.nextInt(num2);
j=rand.nextInt(4);
k=rand.nextInt(4);
operator1=operator[j];
operator2=operator[k];
String s1 = String.valueOf(n1);//将数字n1转换为字符串s1
String s2 = String.valueOf(n2);//将数字n2转换为字符串s2
String s3 = String.valueOf(n3);//将数字n3转换为字符串s3
String s4 = String.valueOf(operator1);//将字符operator1转换为字符串s4
String s5 = String.valueOf(operator2);//将字符operator2转换为字符串s5
String s6 ="=";
String cout=s1+s4+s2+s5+s3+s6;
couts[i]=s1+s4+s2+s5+s3;
System.out.println(cout);
sum[i]=eval(couts[i]);
result=sc.nextInt();
if(result!=sum[i]) {
wrong[wrongnum]=cout;
wrongnum+=1;
}
}
System.out.println("您的错题集为：");
for(i=0;i<wrongnum;i++) {
System.out.println(wrong[i]);
}
System.out.println("错题重练请按1，退出请按0");
choice=sc.nextInt();
if(choice==1) {
int result;
for(i=0;i<wrongnum;i++) {
System.out.println(wrong[i]);
result=sc.nextInt();
if(result==sum[i+1]) {
System.out.println("回答正确，该题错误次数为");
}
}
}
}
if(num==4) {
for(i=1;i<=num1;i++) {
int result;
n1=rand.nextInt(num2);
n2=rand.nextInt(num2);
n3=rand.nextInt(num2);
n4=rand.nextInt(num2);
j=rand.nextInt(4);
k=rand.nextInt(4);
l=rand.nextInt(4);
operator1=operator[j];
operator2=operator[k];
operator3=operator[l];
String s1 = String.valueOf(n1);//将数字n1转换为字符串s1
String s2 = String.valueOf(n2);//将数字n2转换为字符串s2
String s3 = String.valueOf(n3);//将数字n3转换为字符串s3
String s4 = String.valueOf(n3);//将数字n4转换为字符串s4
String s5 = String.valueOf(operator1);//将字符operator1转换为字符串s4
String s6 = String.valueOf(operator2);//将字符operator2转换为字符串s5
String s7 = String.valueOf(operator3);//将字符operator2转换为字符串s5
String s8 ="=";
String cout=s1+s5+s2+s6+s3+s7+s4+s8;
couts[i]=s1+s5+s2+s6+s3+s7+s4;
System.out.println(cout);
sum[i]=eval(couts[i]);
result=sc.nextInt();
if(result!=sum[i]) {
wrong[wrongnum]=cout;
wrongnum+=1;
}
}
System.out.println("您的错题集为：");
for(i=0;i<wrongnum;i++) {
System.out.println(wrong[i]);
}
do {
System.out.println("错题重练请按1，退出请按0");
choice=sc.nextInt();
if(choice==1) {
int result;
for(i=0;i<wrongnum;i++) {
int wrongn=1;//记录错误次数
System.out.println(wrong[i]);
result=sc.nextInt();
if(result==sum[i+1]) {
System.out.println("回答正确，该题错误次数为"+wrongn);
}
else {
wrongn+=1;
System.out.println("回答错误，该题错误次数为"+wrongn);
}
}
}
}while(choice==1);
}
if(num==5) {
for(i=1;i<=num1;i++) {
int result;
n1=rand.nextInt(num2);
n2=rand.nextInt(num2);
n3=rand.nextInt(num2);
n4=rand.nextInt(num2);
n5=rand.nextInt(num2);
j=rand.nextInt(4);
k=rand.nextInt(4);
l=rand.nextInt(4);
m=rand.nextInt(4);
operator1=operator[j];
operator2=operator[k];
operator3=operator[l];
operator4=operator[m];
String s1 = String.valueOf(n1);//将数字n1转换为字符串s1
String s2 = String.valueOf(n2);//将数字n2转换为字符串s2
String s3 = String.valueOf(n3);//将数字n3转换为字符串s3
String s4 = String.valueOf(n3);//将数字n4转换为字符串s4
String s5 = String.valueOf(n3);//将数字n5转换为字符串s5
String s6 = String.valueOf(operator1);//将字符operator1转换为字符串s6
String s7 = String.valueOf(operator2);//将字符operator2转换为字符串s7
String s8 = String.valueOf(operator3);//将字符operator3转换为字符串s8
String s9 = String.valueOf(operator4);//将字符operator4转换为字符串s9
String s10 ="=";
String cout=s1+s6+s2+s7+s3+s8+s4+s9+s5+s10;
couts[i]=s1+s6+s2+s7+s3+s8+s4+s9+s5;
System.out.println(cout);
sum[i]=eval(couts[i]);
result=sc.nextInt();
if(result!=sum[i]) {
wrong[wrongnum]=cout;
wrongnum+=1;
}
}
System.out.println("您的错题集为：");
for(i=0;i<wrongnum;i++) {
System.out.println(wrong[i]);
}
do {
System.out.println("错题重练请按1，退出请按0");
choice=sc.nextInt();
if(choice==1) {
int result;
for(i=0;i<wrongnum;i++) {
int wrongn=1;//记录错误次数
System.out.println(wrong[i]);
result=sc.nextInt();
if(result==sum[i+1]) {
System.out.println("回答正确，该题错误次数为"+wrongn);
}
else {
wrongn+=1;
System.out.println("回答错误，该题错误次数为"+wrongn);
}
}
}
}while(choice==1);
}
}
}
public static void main(String[] args) {
// TODO 自动生成的方法存根

int grade,num1,num2,judge;
Scanner sc=new Scanner(System.in);
System.out.println("请依次输入年级、出题个数、操作数范围：");
System.out.println("(注：二年级操作数范围不超过100，三、四年级操作数范围不超过1000)");
grade=sc.nextInt();
num1=sc.nextInt();
num2=sc.nextInt();
if(grade==2&&num2>100) {
System.out.println("操作数范围不符合规范，已退出答题！");
System.exit(0);
}
else if(grade==3&&num2>1000) {
System.out.println("操作数范围不符合规范，已退出答题！");
System.exit(0);
}
else if(grade==4&&num2>1000) {
System.out.println("操作数范围不符合规范，已退出答题！");
System.exit(0);
}
else {
exercise(grade,num1,num2);
}
}

}

四则运算课堂测试三

原文：https://www.cnblogs.com/zyj3955/p/13832295.html