源码：
//信1905-1 20194191 薛宪光
import java.lang.Math;
import java.util.*;
public class SIZE {
public static void main(String[]args) {
//
//int ques;
//int uk;
//int shangjie,xiajie;
int right =0,wrong=0;
String []array = new String[1000];
//String []cuo_ti_ben = new String[1000];
List<String> list=new ArrayList<String>();
Arrays.fill(array, "");
List<Integer> can_shu=new ArrayList<Integer>();
can_shu.add(0,30);
can_shu.add(1,2);
can_shu.add(2,10);
can_shu.add(3,1);
can_shu.add(4,2);
/*for (int i = 0; i < can_shu.size(); i++) {
int alEach = (int) can_shu.get(i);
System.out.println(alEach);
}*/
mainmenu(can_shu,list);
// Arrays.fill(cuo_ti_ben, "");
/* ques = scanner.nextInt();
System.out.println("please enter the number of unknows:");
uk = scanner.nextInt();
System.out.println("please enter the unknows's shangjie ");
shangjie = scanner.nextInt();
System.out.println("please enter the unknows's xiajie ");
xiajie = scanner.nextInt();*/
zuoti(can_shu,array,list);
}
public static void zuoti(List<Integer>can_shu,String[]array,List<String>list) {
String timu;
int right = 0,wrong=0;
Scanner scanner = new Scanner(System.in);
long starTime=System.currentTimeMillis();
for(int j =1;j<100;j++)
{
System.out.println("下面开始进行第"+j+"套题的训练");
for(int i=1;i<=(int)can_shu.get(0);i++)
{
timu=Random(can_shu,can_shu.get(4));
System.out.print("第"+i+"个题：");
while(panchong(array,timu)==0)//1Bu重，0重
{
timu=Random(can_shu,can_shu.get(4));
}
array[i] = timu;
System.out.print(array[i]);
System.out.println("=");
String linshi = array[i];
//System.out.println(b);
double result1 = jisuan.compute(linshi);
System.out.println("请输入你的答案");
int daan = scanner.nextInt();
if(daan==(int)result1)
{
right++;
System.out.println("恭喜你，答对了！");
}
else {
System.out.println("很遗憾，答错了，这题将加入错题本！");
wrong++;
list.add(linshi);
}
}
System.out.println("总共"+(right+wrong)+"道题目，其中有"+right+"道题目正确，正确率为："+((double)right/(double)(right+wrong))*100+"%");
System.out.println("是否要进行下一套题的训练,1.是.2.否");
int choice2 = scanner.nextInt();
if(choice2==1)
continue;
else
break;
}
long endTime=System.currentTimeMillis();
long Time=endTime-starTime;
System.out.println("本次答题用时"+Time/1000+"秒");
/* System.out.println("是否要进行错题练习，1.是，2.否。");
int choice=scanner.nextInt();
array = null;
if(choice ==2)
{System.out.println("本次答题结束");
}
else {
choice = 0;
System.out.println("是否要继续进行错题本练习，1.是，2.否。");
while(choice==1) {
CuoTiBen(list);
}
}
System.out.println("谢谢使用");*/
}
//界面
public static void mainmenu(List<Integer> can_shu,List<String> list) {
System.out.println("****************欢迎使用四则运算程序****************"
+'
'+"1.参数设置。"+'
'+"2.小学二年级口算题。"
+'
'+"3.小学三年级口算题。"+'
'+"4.小学四年级口算题。"
+'
'+"5.错题集"+'
'+"****************************************************");
Scanner sca = new Scanner(System.in);
int op = sca.nextInt();
switch(op) {
case 1:
can_shu.add(4,0);
canshu(can_shu,list);
break;
case 2:
can_shu.add(4,2);
Random(can_shu,(int)can_shu.get(4));
break;
case 3:
can_shu.add(4,3);
Random(can_shu,(int)can_shu.get(4));
break;
case 4:
can_shu.add(4,4);
Random(can_shu,(int)can_shu.get(4));
break;
case 5:
CuoTiBen(list);
break;
default:
System.exit(0);
break;
}
}
//参数设置
public static void canshu(List<Integer> can_shu,List<String> list) {
Scanner scb = new Scanner(System.in);
System.out.println("请输入出题的数目:");
int a1 = scb.nextInt();
can_shu.add(0,a1);
System.out.println("请输入未知数个数:");
int b1 = scb.nextInt();
can_shu.add(1,b1);
System.out.println("请输入参数上界");
int c1 = scb.nextInt();
can_shu.add(2,c1);
System.out.println("请输入参数下界");
int d1 = scb.nextInt();
can_shu.add(3,d1);
mainmenu(can_shu,list);
}
//题目生成
public static String Random(List<Integer>can_shu,int z)
{
int flag = 0;
String s ;//题目形式
s = "";
int b = (int)can_shu.get(1);//未知数个数
int c = (int)can_shu.get(2);//上界
int d = (int)can_shu.get(3);//下界
if(z>=2)
{
b=2;
c = 100;
d = 1;
if(z>=3)
{
b=4;
c = 1000;
if(z==4)
{
b=5;
flag=1;
}
}
}
int f = (int)(Math.random()*(b-1)+1);
for(int j = 1;j<=b;j++)
{
int random = (int)(Math.random()*(c-d)+d);//生成操作数
s =s+String.valueOf(random);
//System.out.print(random);
if(j==b)
{
System.out.print("");
if(flag==1)
// System.out.print(")");
s= s+")";
// s =s+"=";
//System.out.println("=");
}
else{
int e = (int)(Math.random()*4);
switch(e) {
case 0:
s=s+"+";
// System.out.print("+");
break;
case 1:
s= s+"-";
// System.out.print("-");
break;
case 2:
s= s+"*";
// System.out.print("*");
break;
case 3:
s= s+"/";
// System.out.print("/");
break;
}
if(flag==1)
{
if(f==j)
//System.out.print("(");
s= s+"(";
}
}
}
return s;
}
//判断重复
public static int panchong(String []a,String b) {
int flag = 1;
for(int i = 0;i<a.length;i++)
{
if(a[i].equals(b))
{
flag = 0;//chong
break;
}
else
continue;
}
return flag;
}
//错题本
public static void CuoTiBen(List<String>list) {
System.out.println("欢迎进入错题本练习");
for(int i = 0;i<list.size();i++)
{
Scanner sc = new Scanner(System.in);
String cuotiben = (String)list.get(i);
System.out.print(cuotiben);
System.out.println("=");
double result2=jisuan.compute(cuotiben);
System.out.println("请输入你的答案");
int cuotidaan = sc.nextInt();
if(cuotidaan==(int)result2)
{
System.out.println("恭喜你，答对了！");
list.remove(i);
}
else
{
System.out.println("很遗憾，这题又错了！");
}
}
if(list==null||list.size()==0)
System.out.println("错题本练习结束");
}
}
//calculate class
class jisuan {
/* public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
String str = scanner.nextLine();
//double result1 = compute("-3*-3");
double result1 = compute(str);
System.out.println((int) result1);
}*/
public static int priority(char s) {
switch (s) {
case '(':
case ')':
return 0;
case '-':
case '+':
return 1;
case '*':
case '%':
case '/':
return 2;
default:
return -1;
}
}
public static double compute(double num1, double num2, char s) {
switch (s) {
case '(':
case ')':
return 0;
case '-':
return num1 - num2;
case '+':
return num1 + num2;
case '%':
return num1 % num2;
case '*':
return num1 * num2;
case '/':
return num1 / num2;
default:
return 0;
}
}
public static double compute(String str) {
double num[] = new double[20];
int flag = 0, begin = 0, end = 0, now;
now = -1;
Stack<Character> st = new Stack<Character>();
for (int i = 0; i < str.length(); i++) {
char s = str.charAt(i);
if (s == ' ') {
} else if (s == '+' || s == '-' || s == '*' || s == '/' || s == '(' || s == ')' || s == '%') {
if (flag == 1) {
now += 1;
if (end < begin) {
num[now] = Integer.valueOf(str.substring(begin, begin + 1));
} else {
num[now] = Integer.valueOf(str.substring(begin, end + 1));
}
// System.out.println(num[now]);
flag = 0;
}
if (s == '-') {
if (i == 0) {
flag = 1;
begin = 0;
} else if (str.charAt(i - 1) == '(' || str.charAt(i - 1) == '*'
|| str.charAt(i - 1) == '/') {
flag = 1;
begin = i;
}
else {
if (st.empty()) {
st.push(s);
} else if (s == ')') {
num[now - 1] = compute(num[now - 1], num[now], st.pop());
now -= 1;
st.pop();
} else if (s == '(') {
st.push(s);
} else if (priority(s) <= priority(st.peek())) {
num[now - 1] = compute(num[now - 1], num[now], st.pop());
now -= 1;
st.push(s);
} else {
st.push(s);
}
}
} else if (st.empty()) {
st.push(s);
} else if (s == ')') {
num[now - 1] = compute(num[now - 1], num[now], st.pop());
now -= 1;
st.pop();
} else if (s == '(') {
st.push(s);
} else if (priority(s) <= priority(st.peek())) {
num[now - 1] = compute(num[now - 1], num[now], st.pop());
now -= 1;
st.push(s);
} else {
st.push(s);
}
} else if (flag == 0) {
flag = 1;
begin = i;
} else {
end = i;
}
}
if (flag == 1) {
now += 1;
if (end < begin) {
num[now] = Integer.valueOf(str.substring(begin, begin + 1));
} else {
num[now] = Integer.valueOf(str.substring(begin, end + 1));
}
// System.out.println(num[now]);
}
while (now > 0) {
num[now - 1] = compute(num[now - 1], num[now], st.pop());
now -= 1;
}
return num[0];
}
}