学习内容：设计算法实现自动实现30道100以内四则运算（可以排除重复，选择是否有乘除法）
代码实现：
import java.util.Random;
import java.util.Scanner;
public class Test3 {
public static void main(String[] args) {
int num1,num2;
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];
int sum;
int i,j,k,choice;
char c;
char[] operator=new char[]{'+','-','*','/'};
char[] operator1=new char[]{'+','-'};
System.out.println("包含乘除法请按1，不包含请按0");
Scanner sc=new Scanner(System.in);
choice=sc.nextInt();
Random rand = new Random();
if(choice==1) {
for(i=1;i<=30;i++) {
j=rand.nextInt(4);
c=operator[j];
do{
num1=rand.nextInt(101);
num2=rand.nextInt(101);
}while(num1==0||num2==0);
if(c=='+') {
System.out.print("第"+i+"道题为：");
System.out.println(num1+"+"+num2+"=");
number1[i]=num1;
number2[i]=num2;
for(k=1;k<i;k++) {
if((num1==number1[k]&&num2==number2[k])||(num1==number2[k]&&num2==number1[k])) {
System.out.println("该题与第"+k+"道题目重复");
}
}
}
else if(c=='-') {
System.out.print("第"+i+"道题为：");
System.out.println(num1+"-"+num2+"=");
number3[i]=num1;
number4[i]=num2;
for(k=1;k<i;k++) {
if((num1==number3[k]&&num2==number4[k])) {
System.out.println("该题与第"+k+"道题目重复");
}
}
}
else if(c=='*') {
System.out.print("第"+i+"道题为：");
System.out.println(num1+"*"+num2+"=");
number5[i]=num1;
number6[i]=num2;
for(k=1;k<i;k++) {
if((num1==number5[k]&&num2==number6[k])||(num1==number6[k]&&num2==number5[k])) {
System.out.println("该题与第"+k+"道题目重复");
}
}
}
else if(c=='/') {
System.out.print("第"+i+"道题为：");
System.out.println(num1+"/"+num2+"=");
number7[i]=num1;
number8[i]=num2;
for(k=1;k<i;k++) {
if((num1==number7[k]&&num2==number8[k])) {
System.out.println("该题与第"+k+"道题目重复");
}
}
}
}
}
else {
for(i=1;i<=30;i++) {
j=rand.nextInt(2);
c=operator[j];
do{
num1=rand.nextInt(101);
num2=rand.nextInt(101);
}while(num1==0||num2==0);
if(c=='+') {
System.out.print("第"+i+"道题为：");
System.out.println(num1+"+"+num2+"=");
number1[i]=num1;
number2[i]=num2;
for(k=1;k<i;k++) {
if((num1==number1[k]&&num2==number2[k])||(num1==number2[k]&&num2==number1[k])) {
System.out.println("该题与第"+k+"道题目重复");
}
}
}
else if(c=='-') {
System.out.print("第"+i+"道题为：");
System.out.println(num1+"-"+num2+"=");
number3[i]=num1;
number4[i]=num2;
for(k=1;k<i;k++) {
if((num1==number3[k]&&num2==number4[k])) {
System.out.println("该题与第"+k+"道题目重复");
}
}
}
}
}
}
}
运行截图：
