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Full Discussion: division problem
Top Forums Shell Programming and Scripting division problem Post 18438 by Jimbo on Thursday 28th of March 2002 10:21:38 AM
Old 03-28-2002
Yes, I like awk for working with numbers, particularly when I am dealing with other than whole integers.

The answer of zero that you are getting is correct, but simply truncated to a whole integer. You can force a certain number of decimal places by adding zeros to the numerator. But again, the result will be truncated, not rounded:

a=3
b=17
let x=${a}0000/$b
echo $x
1764
Jimbo
 

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DIV(3)							     Linux Programmer's Manual							    DIV(3)

NAME
div, ldiv, lldiv, imaxdiv - compute quotient and remainder of an integer division SYNOPSIS
#include <stdlib.h> div_t div(int numerator, int denominator); ldiv_t ldiv(long numerator, long denominator); lldiv_t lldiv(long long numerator, long long denominator); #include <inttypes.h> imaxdiv_t imaxdiv(intmax_t numerator, intmax_t denominator); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): lldiv(): _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L; or cc -std=c99 DESCRIPTION
The div() function computes the value numerator/denominator and returns the quotient and remainder in a structure named div_t that contains two integer members (in unspecified order) named quot and rem. The quotient is rounded toward zero. The result satisfies quot*denomina- tor+rem = numerator. The ldiv(), lldiv(), and imaxdiv() functions do the same, dividing numbers of the indicated type and returning the result in a structure of the indicated name, in all cases with fields quot and rem of the same type as the function arguments. RETURN VALUE
The div_t (etc.) structure. CONFORMING TO
SVr4, 4.3BSD, C89. C99. The functions lldiv() and imaxdiv() were added in C99. EXAMPLE
After div_t q = div(-5, 3); the values q.quot and q.rem are -1 and -2, respectively. SEE ALSO
abs(3), remainder(3) COLOPHON
This page is part of release 3.44 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/. 2012-04-17 DIV(3)

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