public class Operation{

public static void main(String[] args) {

int first ;

int second ;

int third;

for (int i=0;i<300;i++){ 

first =(int) (Math.random()*100);

second = (int)( Math.random()*100);

third=(int)(Math.random()*4);

switch(third) {

case 0:

System.out.println(first +"+"+second+"=");

break;

case 1:

System.out.println(first+"-"+ second+"=");

break;

case 2:

System.out.println (first +"*"+ second+"=");

break;

case 3:

if(second==0){

second=(int)(Math.random()*100+1);

System.out.println(first+ "/" +second+"=");

}else{

System.out.println(first+ "/" +second+"=");

}

break;

}

} 

} 

}