Strange output for same Double value

Question

I have the structure as follows:

struct Foo {
    var number: Double

    public init(number: Double) {
        self.number = number
    }
}

but when i run this code ->

var x: Double = 1.12
let foo = Foo(number: x)

print(foo)
print(foo.number)

I get following output:

Foo(number: 1.1200000000000001)
1.12

I think this because of double precision but don't know how to handle it. Any help is very appreciated!

This might help. https://stackoverflow.com/questions/588004/is-floating-point-math-broken — Rakesha Shastri, Sep 18 '18 at 06:40
Essentially the same reason as in [Why are doubles printed differently in dictionaries?](https://stackoverflow.com/questions/40959254/why-are-doubles-printed-differently-in-dictionaries). — Martin R, Sep 18 '18 at 06:44
Related: https://stackoverflow.com/questions/588004/is-floating-point-math-broken — Ahmad F, Sep 18 '18 at 06:54

score 1 · Accepted Answer · answered Sep 18 '18 at 11:23

As in answer explained by @MartinR, Why are doubles printed differently in dictionaries?

It is clear that 1.1200000000000001, is the double precision value of 1.12.

While you are trying to print foo object, print(foo) object is getting printed along with its enclosed information in which number holds the double precisied value of 1.21

Whereas, when you directly print(foo.number), then string representation of foo.number is getting printed which is actually 1.21

Strange output for same Double value

1 Answers1