软件工程第七组第一课

package demo;

import java.util.Random;

public class math {
public static void main(String[] args) {
String[] operate=new String[]{"+","-","×","÷"};
int[] numbers=new int[1000];
for(int i=1;i<=1000;i++){
numbers[i-1]=i;
}
Random r=new Random();
for(int i=0;i<300;i++){
System.out.println(numbers[r.nextInt(1000)]+operate[r.nextInt(4)]+numbers[r.nextInt(1000)]+"=");
}
}
}