I am tasked with creating a quizz program in Java which asks the user to find the answer to 10 addition / subtraction problems form ( a + b ) or ( a - b) = c, where "a" and "b" are random numbers. I was able to do the first part where "a" and "b" get randomly generated and the user is told whether or not their answer is correct. I am stuck on how to generate this question 10 times and how to randomly chose whether the operator is "+" or "-". Below is the code I have so far:
import java.util.Scanner;
import java.util.Random;
public class LetsSee{
public static void main(String [] args){
Scanner keyboard = new Scanner(System.in);
int sum = 0;
int userAnswer ;
int check ;
// Random number generating
Random generator = new Random();
int N1 = generator.nextInt(100);
int N2 = generator.nextInt(N1);
System.out.println(" What is the answer to " + N1 + " + " + N2 + " = " );
userAnswer = new Scanner(System.in).nextInt();
// Display if its correct or not
check = N1 + N2;
if(userAnswer == check){
System.out.println("You are correct!");
}
else{
System.out.println(" Sorry, the correct answer is : " + check);
}
}
}
Help would be GREATLY appreciated. Thanks !
Let me know if this helps. I just added a for loop to ask the user for input 10 times and then built the +/- based off whether a random int was even or odd.
import java.util.Scanner;
import java.util.Random;
public class HelloWorld{
public static void main(String [] args){
Scanner keyboard = new Scanner(System.in);
int sum = 0;
int userAnswer ;
int check ;
// Random number generating
// Ask the user for input 10 times
for (int i = 0; i < 10; i++) {
Random generator = new Random();
int N1 = generator.nextInt(100);
int N2 = generator.nextInt(N1);
int N3 = generator.nextInt(2);
// if N3 is even use plus, if odd use minus
Boolean plus = N3 % 2 == 0;
// Set a string to either "+" or "-" depending on the value of plus
String plusMinus = plus? "+" : "-";
System.out.println(" What is the answer to " + N1 + plusMinus + N2 + " = " );
userAnswer = new Scanner(System.in).nextInt();
// Display if its correct or not
// Set the answer depending on the value of plus.
check = plus? N1 + N2 : N1 - N2;
if(userAnswer == check){
System.out.println("You are correct!");
}
else{
System.out.println(" Sorry, the correct answer is : " + check);
}
}
}
}
So I came up with a quick solution that would look something like this
Random generator = new Random();
int var1 = generator.nextInt(100);
int var2 = generator.nextInt(100);
int choice = generator.nextInt(3);
switch (choice){
case 0:
System.out.println(var1 + " + " + var2);
break;
case 1:
System.out.println(var1 + " - " + var2);
break;
case 2:
System.out.println(var1 + " * " + var2);
break;
case 3:
System.out.println(var1 + " / " + var2);
break;
}
This is just a rough solution, nothing fancy, but hopefully gives you the idea of what you're looking for.
You needed a choice of one of 4 operators, so I've randomly picked a number from 0-3 to get a random operator, which we can then use in a switch to generate a question based on our 2 random numbers
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