四则运算

first初始代码（java编写）

  

import java.util.Scanner;

public class addDemo {
public static void main(String args[]){
Scanner input =new Scanner(System.in);
String[] array={"+","-","*","/"};
for(int i=0;i<300;i++){
int a=(int) (Math.random()*100);
int b=(int) (Math.random()*100);
int c=(int) (Math.random()*10%4);
System.out.println(a+array[c]+b+"=");
}
}
}