Skip to main content

Using the mod() function with negative numbers

Using the mod() function with negative numbers  
 
There are different ways of thinking about remainders when you deal 
with negative numbers, and he is probably confusing two of them. The 
mod function is defined as the amount by which a number exceeds the 
largest integer multiple of the divisor that is not greater than that 
number. In this case, -340 lies between -360 and -300, so -360 is the 
greatest multiple LESS than -340; we subtract 60 * -6 = -360 from -340 
and get 20: 
 
 -420 -360 -300 -240 -180 -120  -60   0   60   120  180  240  300  360
--+----+----+----+----+----+----+----+----+----+----+----+----+----+--
       | |                                                    |  |
   -360| |-340                                             300|  |340
       |=|                                                    |==|
        20                                                     40


Working with a positive number like 340, the multiple we subtract is 
smaller in absolute value, giving us 40; but with negative numbers, we 
subtract a number with a LARGER absolute value, so that the mod 
function returns a positive value. This is not always what people 
expect, but it is consistent.

If you want the remainder, ignoring the sign, you have to take the 
absolute value before using the mod function.
 
Source: http://www.mathforum.org 

Comments

Popular posts from this blog

Sample : String Reverse In Java

import java.io.*; class test {     public static void main(String args[])     {         DataInputStream in=new DataInputStream(System.in);         try         {             String text;             System.out.println("\nEnter The Text");             text=in.readLine();             System.out.println("\nIn Reverse Order::\n");             for(int i=text.length()-1;i>=0;i--)             {                 System.out.print(text.charAt(i));             }          ...

Using GREP in UNIX

How To Use grep Command In Linux / UNIX by  VIVEK GITE  on  AUGUST 2, 2007  ·  147 COMMENTS H ow do I use grep command in Linux? grep command searches the given file for lines containing a match to the given strings or words. By default, grep prints the matching lines. Use grep to search for lines of text that match one or many regular expressions, and outputs only the matching lines. The name, "grep", derives from the command used to perform a similar operation, using the Unix/Linux text editor ed: g/re/p grep command syntax grep 'word' filename grep 'string1 string2' filename cat otherfile | grep 'something' command | grep 'something' Use grep to search file Search /etc/passwd for boo user: $ grep boo /etc/passwd You can force grep to ignore word case i.e match boo, Boo, BOO and all other combination with -i option: $ grep -i "boo" /etc/passwd Use grep recursively You can search recursively i.e. read all files under each ...