C program round off number

The absolute value of a number is always positive. Only integer values are supported in C. This function returns the nearest integer which is less than or equal to the argument passed to this function. This function returns nearest integer value which is greater than or equal to the argument passed to this function. This function is used to calculate sine value. This function is used to calculate cosine. I just confirmed that the Googled code gives the correct answer for 4.

Improve this answer. Marcelo Cantos Marcelo Cantos k 37 37 gold badges silver badges bronze badges. You're right Not sure what you are asking, but an expression a?

In this case the idea is to move the value of num away from zero by 0. This way the truncation will round to the nearest int e. The comparison is done because the statement is for a general-use-case where num could be positive or negative , not for the specific case in his example program.

If the whole point of the question was, "how do you round 4. This produces 4 with. There's a plugin for emacs that turns this on by default. This methods fails when num is outside the range of int 2 It would fail for many other float except that it uses double math.

Show 6 more comments. Would also be cool to have examples of setting the current rounding direction and the inexact flag. Ciro Example added. Add a comment. Puppy Puppy k 34 34 gold badges silver badges bronze badges. Dan Story Dan Story 9, 1 1 gold badge 22 22 silver badges 27 27 bronze badges.

Shiroko Shiroko 1, 8 8 silver badges 12 12 bronze badges. If the questioner genuinely doesn't want to use ceil and floor, but genuinely is happy to use the built-in conversion to int, then the question can be filed under "quirky interview-style questions which involve an unnatural restriction to illustrate some point fully understood only by the interviewer". Unfortunately that doesn't fit in a tag. Steve, you are right. This is an question often asked in interviews.

Arkku Arkku Ekimov Alexander Ekimov Alexander 3 3 bronze badges. Not a C solution. Algorithm fails for x just less than 0. JJussi JJussi 1, 10 10 silver badges 12 12 bronze badges. What you have posted does not compile in C - the language this post is tagged. Perhaps you are coding per another language? There that int float x returns just integer stripping decimals away.

What is "right" way to strip just decimals away? The "right" way to strip decimals away from a float is tuncf x. Use float truncf float x ; for float. This is a very simple program. I tried my best to do it in the easiest way possible. Hope you like it. If you have any doubts, please comment below. Your email address will not be published. Please enable JavaScript to submit this form.