四则运算

package 四则运算;

import java.util.Random;
public class Sutest {

public static void main(String[] args){

String[] operate=new String[]{"+","-","×","÷"};
int[] numbers=new int[100];
for(int i=1;i<=100;i++){
numbers[i-1]=i;
}
Random r=new Random();
for(int i=1;i<=30;i++){
System.out.println(i+". "+numbers[r.nextInt(100)]+operate[r.nextInt(4)]+numbers[r.nextInt(100)]+"=");
}

}
}