Conversion of book dimension from decimal to fraction

Hi,
I am a crystal report developer and new to SAP R3 environment. I am creating reports with SAP BW queries as source. I am working for a publishing client. They are storing the material (Book) details in the SAP system (Material table). SAP has a provision to capture physical properties of the book like width, height and thickness. They are entering details upto 3 decimal places precision in inches or in specified unit of measure.
When some extracts are generated from SAP System the values like 10.380 is converted as 10-3/8. But the actual 10-3/8 value is 10.375. The rounding is not uniform when I checked with few other values. I came to know from SAP experts these conversion are happened in an IDOC. I don't know much about this.
Can anyone help me in this conversion logic. Since I have to implement the same in my Crystal report. My BW query is just giving it in the decimals, my users are interested in seeing it as fraction since the other exports from SAP is showing it in fraction.
Thanks and Regards,
Subbu S.

In the user exit of Outbound Idoc, they might have used some custom logic to implement the given logic.
It may vary on other factors as well. In your case, that should be verified or cross checked in your system only.
For converting the decimal to fraction in SAP, you can refer the below function module.
'CONVERT_TO_FRACTION'

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//example.cc
#include <iostream>
#include "reduce.h"
#include "decimal-to-fraction.h"
using namespace std;
int main()
double deci;
double n, d;
while(1) {
cout << "Enter a decimal to convert to a fraction ('0' to quit): ";
cin >> deci;
cin.ignore(INT_MAX, '\n');
if(!deci) exit(0);
dec_to_frac(deci, n, d);
if (n * d != n){
cout << '\n' << deci << " = " << n << '/' << d << "\n\n";
cout<<'\n' << d << " x " << n;
n = d * n;
cout<< " = " << n << "\n\n";
cout<<'\n' << n << '/' << d;
reduce(n, d);
cout << " = " << n << '/' << d << "\n\n";
cout<<'\n' << n << "\n\n";
else
cout<<'\n' << deci<< "\n\n";
return 0;
#ifndef _REDUCE_H_
#error You must include "reduce.h" before this file
#endif /* def _REDUCE_H_ */
#ifndef _DECIMAL_TO_FRACTION_H_
#define _DECIMAL_TO_FRACTION_H_
void dec_to_frac(double decimal, double &numerator, double &denominator)
//numerator = static_cast<int >(decimal);
//numerator = (int )decimal;
numerator = decimal;
denominator = 1;
while(numerator != (int)numerator) {
numerator *= 10;
denominator *= 10;
reduce(numerator, denominator);
#endif /* def _DECIMAL_TO_FRACTION_H_ */
#ifndef _REDUCE_H_
#define _REDUCE_H_
void reduce(double &numer, double &denom)
int i;
for(i=2; i<=numer; ++i) {
if( ((numer/i) == ((int )(numer/i))) && ((denom/i) == ((int)(denom/i))) ) {
numer /= i;
denom /= i;
--i;
#endif /* def _REDUCE_H_ */

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Using ++i or i++ as the third expression in your for loop will make zero difference.
for (int i=2; i<=numer; ++i)
will have exactly the same effect as
for (int i=2; i<=numer; i++)
, though they may have slightly different performances. The reason for this is that the third expression (i++ or ++i) is evaluated after every iteration of the loop, meaning it doesn't happen until the end of the loop body is reached, and then it's evaluated independently, meaning all you end up with is 'i' incrementing.
As for this:
if( ((numer/i) == ((int )(numer/i))) && ((denom/i) == ((int)(denom/i))) ) {
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if (numer % i == denom % i == 0) {
That's about right, it would look more like
if (numer %i == 0 && denom % i == 0)
- the other way would probably not behave the way you expect.
Some other tips:
numer and denom should be 'int' or 'long' - not double. You don't expect your numerator and denominator to have decimal points, so use integral types - using floating point 'double's is likely what's getting you into this trouble -- floating point arithmetic is inherently imprecise. You might have better luck parsing the input yourself and constructing the numerator from that instead of reading directly into a floating-point number.
I'm hacking around with your code right now for fun; I'll let you know if I find anything.
==edit==
Oh, something else I wanted to mention; to break on a line in gdb you type:
break filename:linenumber
ie.
break example.cc:16
Last edited by Cerebral (2007-06-03 02:43:42)

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Conversion of book dimension from decimal to fraction

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