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IDS Forum

Re: deccmp return value differs between 2 informix

Posted By: LAKSHMI DEVI PALANISSAMY
Date: Wednesday, 15 July 2009, at 7:48 a.m.

In Response To: Re: deccmp return value differs between 2 informix (PING TANG)

Hi Ping,

I have written a stub similar to our application to reproduce the issue.

Find the sample program:

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
EXEC SQL include decimal;

main()
{

int x;
char result1[50];
double highod;
#define END1 sizeof(result1)

EXEC SQL BEGIN DECLARE SECTION;
dec_t val1, high_od, dtemp;
char value1[50];
EXEC SQL END DECLARE SECTION;

EXEC SQL connect to 'oas';
EXEC SQL begin work;
EXEC SQL drop table db_assay;
EXEC SQL create table db_assay(assay_key integer, var_value char(50));
EXEC SQL insert into db_assay values ('1', "0.300");
EXEC SQL commit work;

printf ("\n~~~~~~~~high_od value from database~~~~~~~\n");

/******* retrieving the value from database *******/
EXEC SQL select var_value into :value1 from db_assay where assay_key=1;
value1[END1-1]='\0';
printf("High OD from database is %s\n", value1);

/**** converting the value to double **********/
highod = atof(value1);
printf("High OD(in double) is %lf\n", highod);
/**** convering the value to decimal *********/
if(x = deccvdbl(highod,&high_od))
{

printf("Error in converting to decimal from double\n");

exit(1);
}
if (x = dectoasc(&high_od, result1, sizeof(result1), 20))
{

printf("Error %d in converting result to string\n", x);

exit(1);
}
result1[END1-1] = '\0';
printf("high-od value(in decimal) is %s\n", result1);
printf ("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n");

/**** assigning a value of 0.300000000 to a string *****/
char str1[] = "0.30000000000000000";

/**** converting the value to decimal *****/
if (x = deccvasc(str1, strlen(str1), &val1))
{

printf("Error %d in converting string1 to DECIMAL\n", x);

exit(1);
}
if (x = dectoasc(&val1, result1, sizeof(result1), 20))
{

printf("Error %d in converting result to string\n", x);

exit(1);
}
result1[END1-1] = '\0';
printf("value in decimal is %s\n", result1);

/**** difference between the value from database and 0.30000000 *****/
if (x = decsub(&high_od, &val1, &dtemp))
{

printf("Error %d in subtracting decimals\n", x);

exit(1);
}
if (x = dectoasc(&dtemp, result1, sizeof(result1), 20))
{

printf("Error %d in converting result to string\n", x);

exit(1);
}
result1[END1-1] = '\0';
printf("diff. is %s\n", result1);

printf("size of decimal is %d, double is %d\n", sizeof(val1), sizeof(highod));
EXEC SQL disconnect current;
exit(0);
}

Output:
~~~~~~~~high_od value from database~~~~~~~
High OD from database is 0.300
High OD(in double) is 0.300000
high-od value(in decimal) is 0.29999999999999999000
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
value in decimal is 0.30000000000000000000
diff. is -0.00000000000000001000
size of decimal is 22, double is 8

We observe from the above stub output that a value of 0.300 stored in database, upon converting
to double and then to decimal has a value of 0.29999999999999999000

We are not sure as why it is so. We suspect whether the precision is affected when we convert
from decimal to double.

We are using IDS version 11.5 for database and RHEL version 5.3 for OS
Is the difference due to informix versions?

Thanks in advance.

Regards,
Lakshmi

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