Easy code, but many errors 😰

Question

import java.util.Scanner;

public class calculator {
public static void main(String[] args) {
Scanner calc = new Scanner(System.in);
System.out.println("Enter 1st number ____.(In order)");
double num1 = calc.nextInt();
System.out.println("Enter 2nd number ____.(In order)");
double num2 = calc.nextInt();
System.out.println("Enter the operation ____.(+ for addition, - for subtraction, * for multiplication and / for division)");
String operator = calc.nextLine();

switch(operator) {
case "+":
System.out.println("Sum of " + num1 + "and " + num2 + "is " + num1+num2);
break;

case "-":
System.out.println("Difference of " + num1 + "and " + num2 + "is " + num1-num2);
break;

case "*":
System.out.println("Product of " + num1 + "and " + num2 + "is " + num1*num2);
break;

case "/":
System.out.println("Division of " + num1 + "and " + num2 + "is " + num1/num2);
break;

default:
System.out.println("Noob i said you to type +/-/*// and you typed none Shame on you.")

}
}
}

ERROR:

./Playground/calculator.java:31: error: ';' expected
System.out.println("Noob i said you to type +/-/*// and you typed none Shame on you.")
^
1 error

Answer 1

Doesn't the error message make it quite clear ?

There is a missing semicolon at the end of last "system.out.println()" { inside "default" case }

Answer 2

Again, the error message says it all.
You are trying to perform subtraction between a string and a double { When doing "is" + num1 - num2 } which is not possible.

I think you are aiming for something like this { ..."is" + (num1 - num2) }

Answer 3

Ojas Kanotra

1 - If you don't use paranthesis () after string then that would be also string so add ( ) before and after each mathematical operation.

2 - nextInt() method returns int value so use nextDouble() for double value.

3 - semi-colon is necessary after each statement in Java.

4 - use next() method instead of nextLine() because nextLine() will read empty space also.

https://code.sololearn.com/co6IC6yPDWbE/?ref=app

Answer 4

Error code is :

import java.util.Scanner;

public class calculator {
public static void main(String[] args) {
Scanner calc = new Scanner(System.in);
System.out.println("Enter 1st number ____.(In order)");
double num1 = calc.nextInt();
System.out.println("Enter 2nd number ____.(In order)");
double num2 = calc.nextInt();
System.out.println("Enter the operation ____.(+ for addition, - for subtraction, * for multiplication and / for division)");

./Playground/calculator.java:19: error: bad operand types for binary operator '-'
System.out.println("Difference of " + num1 + "and " + num2 + "is " + num1-num2);
^
first type: String
second type: double
1 error

Answer 5

Thanks. Main was calc.next() [As given by you] and calc.nextLine [What i was writing] and using perenthesis.
It helped.