How come 13/3 is 4.0?

Question

so i was doing this task where I was required to "think as a machine" and calculate an expression keeping in mind the priority of the operators. And this is the expression I got : 813%100/3+2.4.
so here's what I did: 813%100=13. 13/3=4.33. 4.33+2.4=6.73. and I was wrong! so I tried to reproduce it in ide and realized that it calculated 13/3 as equal to 4.0! so my question is WHAT THE F?

Answer 1

/ Does not only display whole numbers, it returns the type that was divided.
13 / 3 is an int / int, so it returns an int.
Since you likely assigned it's value to a double, the .0 was added.

double a = 13/3; // equals 4.0

int b = 13/3; // equals 4

double c = 13.0 / 3; // equals 4.3333..
// since this is double / int

int c = 13.0 / 3;
// This is error

Answer 2

I don't write in Java, but I know that the % operator will only output the remainder of the dividend, and / will only display whole numbers. Try separating out the operations into variables for better flow and more control. Computers might be smart, but that's only because people made them smart. They're still just dumb rocks

public class Program
{
public static void main(String[] args) {
int abc = (int) 10;
int def = (int) 3;
int h = (int) abc/def; //division, output a whole number
//10/3 = 3 1/3, output: 3
System.out.println(h);
int g = (int) abc%def; //division, output the remainder of the dividend
//10%3 = 3 1/3, output: 1
System.out.println(g);
}
}

Answer 3

It is dependent on the type. 13 and 3 are both whole numbers, so you'll get a whole number back. There's an easy hack though:

13/3 == 4
13/3. == 4.3333333333333

3 with a dot is short for 3.0, so now you're dividing a whole number by a float, and you'll get a float back.

Answer 4

double x = 13/3; will still give you a plain 4, if that is what you mean. On the right side you are juggling integers and doing integer operations, only afterwards it will be converted to double and stored in x.

Answer 5

I didn't know that / will only display whole numbers hmm, I thought that was dependant on the type of the variable

Answer 6

well I declared the type double since there was +2.4

Answer 7

aww now I got it, thanks!

Answer 8

thanks a lot!