I am new to Java and I am creating a simple calculator. I used while loop to run it continuously but I couldn't stop it, Please help me with the code.
My calculator class code is:
package calculator;
import java.util.Scanner;
public class Calculator {
public static void main(String[] args) {
Boolean keepRunning = true;
while (keepRunning) {
double a, b, out;
int n;
String ans = null;
Scanner in = new Scanner(System.in);
System.out.println("Enter two Numbers ");
a = in.nextDouble();
b = in.nextDouble();
System.out.println("Enter the mode of operation:" + "\n"
+ "1. Addition" + "\n"
+ "2. Subtraction" + "\n"
+ "3. Multiplication" + "\n"
+ "4. Division");
n = in.nextInt();
switch(n){
case 1:
out = add(a,b);
System.out.println("The output is: "+ out );
break;
case 2:
out = sub(a,b);
System.out.println("The output is: "+ out );
break;
case 3:
out = mul(a,b);
System.out.println("The output is: "+ out );
break;
case 4:
out = div(a,b);
System.out.println("The output is: "+ out );
break;
default:
System.out.println("Enter Valid option");
break;
}
System.out.println("Do you want to continue? (Y/N)");
Scanner in1 = new Scanner(System.in);
ans = in1.next();
if(ans == "Y" || ans == "y"){
}else if(ans == "N" || ans == "n"){
keepRunning = false;
System.exit(0);
}
}
}
public static double add(double a, double b){
return a+b;
}
public static double sub(double a, double b){
return a-b;
}
public static double mul(double a, double b){
return a*b;
}
public static double div(double a, double b){
return a/b;
}
}
The if loop is not at all running what's the problem in it.
Note: This question is already exist in Stackoverflow but I can't find my answer.
