INFORMIX-ESQL/C Programmer's Manual ESQL/C Function Library

The dectrunc() function truncates a rounded decimal type number to fractional digits.

void dectrunc(d,  s)

	dec_t  *d;  

	mint  s;  

 



d  

is a pointer to a decimal structure for a rounded number whose value dectrunc() truncates. 


s

is the number of fractional digits to which dectrunc() truncates the number. Use a positive number or zero for this argument.

The following table shows the sample output from dectrunc() with various inputs.

The file dectrunc.ec in the demo directory contains the following sample program.

/*
* dectrunc.ec *

The following program truncates a DECIMAL number six times and displays each
result.
*/

#include <stdio.h>

EXEC SQL include decimal;

char string[] = "-12345.038572";
char result[41];

main()
{
mint x;
mint i = 6; /* number of decimal places to start with */
dec_t num1;

printf("DECTRUNC Sample ESQL Program running.\n\n");

printf("String = %s\n", string);
while(i)
{
if (x = deccvasc(string, strlen(string), &num1))
{
printf("Error %d in converting string to DECIMAL\n", x);
break;
}
dectrunc(&num1, i);
if (x = dectoasc(&num1, result, sizeof(result), -1))
{
printf("Error %d in converting result to string\n", x);
break;
}
result[40] = '\0';
printf(" Truncated to %d Fractional Digits: %s\n", i--, result);
}

printf("\nDECTRUNC Sample Program over.\n\n");
}

DECTRUNC Sample ESQL Program running.



String = -12345.038572

  Truncated to 6 Fractional Digits: -12345.038572                           

  Truncated to 5 Fractional Digits: -12345.03857                            

  Truncated to 4 Fractional Digits: -12345.0385                             

  Truncated to 3 Fractional Digits: -12345.038                              

  Truncated to 2 Fractional Digits: -12345.03                               

  Truncated to 1 Fractional Digits: -12345.0                                



DECTRUNC Sample Program over.