The decsub() function

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

/*
   * decsub.ec *

   The following program subtracts two DECIMAL numbers and displays the result.
*/

#include <stdio.h>

EXEC SQL include decimal;

char string1[] = "1000.038782";
char string2[] = "480";
char result[41];

main()
{
    mint x;
    dec_t num1, num2, diff;

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

    if (x = deccvasc(string1, strlen(string1), &num1))
      {
      printf("Error %d in converting string1 to DECIMAL\n", x);
      exit(1);
      }
    if (x = deccvasc(string2, strlen(string2), &num2))
      {
      printf("Error %d in converting string2 to DECIMAL\n", x);
      exit(1);
      }
    if (x = decsub(&num1, &num2, &diff))
      {
      printf("Error %d in subtracting decimals\n", x);
      exit(1);
      }
   if (x = dectoasc(&diff, result, sizeof(result), -1))
      {
      printf("Error %d in converting result to string\n", x);
      exit(1);
      }
    result[40] = '\0';
    printf("\t%s - %s = %s\n", string1, string2, result);

    printf("\nDECSUB Sample Program over.\n\n");
    exit(0);
}