January 4th, 2013, 12:23 PM  #1 
Member Joined: Aug 2011 Posts: 42 Thanks: 0  Cutting off decimals
Hello! Is there any good method for cutting off decimals from a number? I've been thinking about it for a while, and came up with this method (assume x is a decimal number): x  x%1 = x without decimals In the situation I'm using this method, everything looks so messy, because I reuse it several times. Is there another way to cut off decimals like this? Thanks /Benmuskler 
January 4th, 2013, 12:40 PM  #2 
Global Moderator Joined: Nov 2006 From: UTC 5 Posts: 16,046 Thanks: 938 Math Focus: Number theory, computational mathematics, combinatorics, FOM, symbolic logic, TCS, algorithms  Re: Cutting off decimals
What are you using? In C I would write (int)x or the like. In GP I would write x\1 or floor(x). In Perl you can do floor(x) as long as you have use POSIX;. 
January 4th, 2013, 12:46 PM  #3 
Member Joined: Aug 2011 Posts: 42 Thanks: 0  Re: Cutting off decimals
I'm sorry I might have been a bit unclear. I'm not using any programming language. It's only mathematical.

January 4th, 2013, 12:47 PM  #4 
Global Moderator Joined: Nov 2006 From: UTC 5 Posts: 16,046 Thanks: 938 Math Focus: Number theory, computational mathematics, combinatorics, FOM, symbolic logic, TCS, algorithms  Re: Cutting off decimals
Then I would write , or in a pinch either [x] or floor(x).

January 4th, 2013, 12:53 PM  #5 
Member Joined: Aug 2011 Posts: 42 Thanks: 0  Re: Cutting off decimals
Thanks! I can't say I've ever seen the floor function written like that before, i.e. the Lshaped brackets. Is that some standard/official way of writing it that my teacher will understand when reading the work through?

January 4th, 2013, 03:21 PM  #6 
Senior Member Joined: Jul 2010 From: St. Augustine, FL., U.S.A.'s oldest city Posts: 12,211 Thanks: 520 Math Focus: Calculus/ODEs  Re: Cutting off decimals
Yes, your teacher should be familiar with any of the notations given by [color=#008000]CRGreathouse[/color].

January 6th, 2013, 01:04 PM  #7 
Senior Member Joined: Dec 2012 Posts: 148 Thanks: 0  Re: Cutting off decimals
you can show any number x = [x] + {x}


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