Hi Friend,

Try the following code:

import java.util.*;

public class Operations {
public static void main(String[] args) throws Exception {
Scanner scan = new Scanner(System.in);
Random random1 = new Random();
Random random2 = new Random();
int menu = 0;
System.out.println("Test");
System.out.println();
System.out.println("1. Add");
System.out.println("2. Subtract");
System.out.println("3. Multiply");
System.out.println("4. Divide");
System.out.println("5. Exit");

boolean quit = false;
do{
System.out.print("Please enter your choice: ");
menu = scan.nextInt();
System.out.println();

switch(menu) {
case 1:
int r1=0,w1=0;
for (int idx = 1; idx <= 10; ++idx){
int ran1 = random1.nextInt(50);
int ran2 = random2.nextInt(50);
System.out.print(ran1 + " + " +ran2+" = ");
int add=scan.nextInt();
int total=ran1+ran2;
if(add!=total){
w1++;
}
else{
r1++;
}
}
System.out.println("Right="+r1);
System.out.println("Wrong="+w1);
if(r1>7){
System.out.println("Congratulations!");
}
else{
System.out.println("Please ask your teacher for help");
}
break;
case 2:
int r2=0,w2=0;
for (int idx = 1; idx <= 10; ++idx){
int ran1 = random1.nextInt(50);
int ran2 = random2.nextInt(50);
System.out.print(ran1 + " - " +ran2+" = ");
int sub=scan.nextInt();
int total=ran1-ran2;
if(sub!=total){
w2++;
}
else{
r2++;
}
}
System.out.println("Right="+r2);
System.out.println("Wrong="+w2);
if(r2>7){
System.out.println("Congratulations!");
}
else{
System.out.println("Please ask your teacher for help");
}
break;
case 3:
int r3=0,w3=0;
for (int idx = 1; idx <= 10; ++idx){
int ran1 = random1.nextInt(50);
int ran2 = random2.nextInt(50);
System.out.print(ran1 + " * " +ran2+" = ");
int mul=scan.nextInt();
int total=ran1*ran2;
if(mul!=total){
w3++;
}
else{
r3++;
}
}
System.out.println("Right="+r3);
System.out.println("Wrong="+w3);
if(r3>7){
System.out.println("Congratulations!");
}
else{
System.out.println("Please ask your teacher for help");
}
break;
case 4:
int r4=0,w4=0;
for (int idx = 1; idx <= 10; ++idx){
int ran1 = random1.nextInt(50);
int ran2 = random2.nextInt(50);
System.out.print(ran1 + " / " +ran2+" = ");
int div=scan.nextInt();
int total=ran1/ran2;
if(div!=total){
w4++;
}
else{
r4++;
}
}
System.out.println("Right="+r4);
System.out.println("Wrong="+w4);
if(r4>7){
System.out.println("Congratulations!");
}
else{
System.out.println("Please ask your teacher for help");
}
break;
case 5:
quit = true;
break;
default:
System.out.println("Invalid Entry!");
}
}
while (!quit);
}
}

Thanks