课后作业——30道四则运算

public class Main {
public static void main(String[] args) {
int a1=0,a2=0,i=0,x=0;
for(i=0;i<30;i++)
{
a1=(int)(Math.random()100)+1;
a2=(int)(Math.random()100)+1;
x=((int)(Math.random()10)+1)%3;
if(x0){
System.out.println(a1+"+"+a2+"=");
}
else if(x1){
System.out.println(a1+"-"+a2+"=");
}
else if(x==2){
System.out.println(a1+""+a2+"=");
}
else if(x==3){
System.out.println(a1+"/"+a2+"=");
}
}
}
}