Convert Double Value ToString()

Question

May be I'm asking silly question but I don't understand why this doesn't give me the output I expect (i.e 2.5):

double x = 5/2;
Console.WriteLine(x.ToString());

.Net Fiddle

Integer division. `5/2 == 2`.Try `double x = 5.0/2` – AlexD Jul 13 '15 at 12:06 — AlexD, Jul 13 '15 at 12:06
Tnx @AlexD! and the answer helped me understand – Mike Debela Jul 13 '15 at 12:15 — Mike Debela, Jul 13 '15 at 12:15

Soner Gönül · Accepted Answer · 2015-07-13T12:16:18.373

5 / 2 performs integer division no matter which type you assign it. It always disregards fractional part.

You need to use floating-point division instead.

double x = 5.0 / 2;
double x = 5 / 2.0;
double x = 5.0 / 2.0;

From / Operator

When you divide two integers, the result is always an integer. For example, the result of 7 / 3 is 2.

From C# Specification part $7.7.2 Division operator, there 3 types of division;

Integer division
Floating-point division
Decimal division

And from the relevant part in integer division;

The division rounds the result towards zero, and the absolute value of the result is the largest possible integer that is less than the absolute value of the quotient of the two operands. The result is zero or positive when the two operands have the same sign and zero or negative when the two operands have opposite signs.

Thanks @Soner Gönül, nice explanation – Mike Debela Jul 13 '15 at 12:25 — Mike Debela, Jul 13 '15 at 12:25

Convert Double Value ToString()

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