convert.todouble and console.readline

Question

if I write this
double age = Convert.ToDouble(Console.ReadLine());
Console.WriteLine("You are {0} years old", age);
and I enter 4.4 it writes 4.4. if I write 4,4 it writes 44. why does this happen?

Answer 1

in Europe we use comma for floating point numbers. so I made a typo by writing 4,4 as an input. I just would like to know why it ignored the comma and it didn't report an error like when I type a character instead of a float

Answer 2

Ahh, it's because the Convert.ToDouble() function already expects a string input with a group separator (,) which it simply ignores.
That thing, happens only for comma.

Answer 3

4,4? as in (four-comma-four)? or that was just a typographical error?

Answer 4

thank you