Thread: Problem with calcylator.

Hey

I´m trying to make a calcylator in java. First you write the first number, then the second number and then the unit(+,-/ or *). But i only get lots of errors the whole time and i can´t see my problem.
Here´s my code

 import java.util.Scanner;
 
class KO{
    public static void main(String args[]){
	     Scanner Alexander = new Scanner(System.in);
		 double fnum, snum, unit, answer;
		 System.out.println("Write fnum: ");
		 fnum = Alexander.nextDouble();
		 System.out.println("write snum: ");
		 snum = Alexander.nextDouble();	
		 System.out.println("+,-,/,*: ");
		 unit = Alexander.nextDouble();	
		  if (unit = +) { 
		  answer = fnum + snum;
		  }if (unit = -) {
         answer = fnum - snum;		  
		  System.out.println(answer);
		}  
	}	 
}

And the errors is.

calculator2.java:13; error: illegal start of expression
if (unit = +) {

calculator2.java:15: error illegal start of expression
} if (unit = -) {

Sincrerly
JustACode

Originally Posted by Norm

Please copy the full text of the error messages and paste it here.

Please edit your post and wrap your code with
[code=java]
<YOUR CODE HERE>
[/code]
to get highlighting and preserve formatting.

Fixed it.

This is what i´m trying to do. When you start the program, the text "Enter first number" will be shown. Then you write some numbers and press enter. The text "Enter second number" will be shown. Write some numbers ad click enter the text "choose a unit" will be show. This is here my problem. I have problems to make that if you choose +, sum is fnum + snum = answer, if you choose * the sum is fnum * snum, if you choose - the sum is fnum - snum and if you choose / the sum is fnum / snum.

Originally Posted by Norm

Did you change the code to read the arithmetic operators as Strings and not as numbers?

What exactly do you mean i should do?