CODEWITHSUNDEEP
c#
sgtz
sgtz

Reputation: 9019

implicit cast yields incorrect result

Would you consider this to be a bug, or to be expected behaviour?

Consider the following

  1 * (2/(1+2))

  equals 0

  1 * ((double)2/(1+2))

  equals 0.6667

Upvotes: 0

Views: 71

Answers (3)

Daniel Hilgarth
Daniel Hilgarth

Reputation: 174339

This is not a bug. Arithmetic operations where all operands are int yield an int as result.
This is also documented in the MSDN:

When you divide two integers, the result is always an integer. For example, the result of 7 / 3 is 2. To determine the remainder of 7 / 3, use the remainder operator (%). To obtain a quotient as a rational number or fraction, give the dividend or divisor type float or type double. You can do this implicitly by expressing the dividend or divisor as a decimal by putting a digit to the right of the decimal point

Upvotes: 3

user854301
user854301

Reputation: 5493

You should use double/float numbers if you wanna to have result in this format:

1 * (2.0/(1+2))

or

1 * (2f/(1+2))

or

1 * (2d/(1+2))

Upvotes: 1

JleruOHeP
JleruOHeP

Reputation: 10376

It is ok, since you have used ints in your expression. You can use double operands instead of cast: 

1d * (2d/(1d+2d))

Here is link: http://msdn.microsoft.com/en-us/library/678hzkk9(v=vs.71).aspx

Upvotes: 1

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