Question

double variable = Convert.ToDouble(5/100);

Will return 0.0 but i expected 0.05

What can / must i change to get 0.05

because the 5 in this example is a variable

Answer 1

5/100 is done in integer arithmetic, which yields 0 before conversion. Try

double variable = 5.0/100;

If 5 is in a variable x (of integer type), then use:

variable = (double)x/100; 

or

variable = ((double)x)/100;

to make the intent clear (thanks John!)

or

variable = x/100.0;