CODEWITHSUNDEEP
c#
Abbes omar
Abbes omar

Reputation: 51

Strange result in c#

My problem is too strange, Brief : 

double a = 1 / 2;
MessageBox.Show(a.ToString());

It shows 0 I tried with decimal , float but it's always 0

Upvotes: 1

Views: 151

Answers (4)

eBuisan
eBuisan

Reputation: 98

Try this:

double a = (double)1 / (double)2;

Regards,

Upvotes: 2

Tigran
Tigran

Reputation: 62265

you need to write : 

double a= 1 / 2.0d;

By dividing int to int compiler produces int result and after assigns it to double.

It's the same like writing: 

 int resultInt = 1/2;
 double a = resultInt;

By specifying in your operation 2.0d you explicitly manifest your intention to produce double after devision.

Upvotes: 11

Bathsheba
Bathsheba

Reputation: 234875

The division is being performed in integer arithmetic which means you will lose precision before the result is assigned to your double type.

Promote one of the literals to a double to force the calculation to be performed in floating point. i.e. write

double a = 1.0 / 2;

Upvotes: 5

StuartLC
StuartLC

Reputation: 107387

1 and 2 are both regarded as integer constants. The result of an int divided by an int is another int, before it is cast to double. Indicate to the compiler that at least one of the constants is double by suffixing it with d, or providing a decimal point.

e.g.

double a = 1d/2d;

Upvotes: 4

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