The ifx_int8sub() function

The file int8sub.ec in the demo directory contains the following sample program.

/*
   *int8sub.ec *

    The following program obtains the difference of two INT8
    type values.
*/

#include <stdio.h>

EXEC SQL include "int8.h";

char string1[] = "6";
char string2[] = "9,223,372,036,854,775";
char string3[] = "999,999,999,999,999.5";
char result[41];

main()
{
    mint x;
    ifx_int8_t num1, num2, num3, sum;

    printf("IFX_INT8SUB Sample ESQL Program running.\n\n");

    if (x = ifx_int8cvasc(string1, strlen(string1), &num1))
        {
        printf("Error %d in converting string1 to INT8\n", x);
        exit(1);
        }
    if (x = ifx_int8cvasc(string2, strlen(string2), &num2))
        {
        printf("Error %d in converting string2 to INT8\n", x);
        exit(1);
        }

    /* subtract num2 from num1 */

   if (x = ifx_int8sub(&num1, &num2, &sum))
        {
        printf("Error %d in subtracting INT8s\n", x);
        exit(1);
        }
    if (x = ifx_int8toasc(&sum, result, sizeof(result)))
        {
        printf("Error %d in converting INT8 result to string\n", x);
        exit(1);
        }
    result[40] = '\0';
    printf("\t%s - %s = %s\n", string1, string2, result); /* display result */

    if (x = ifx_int8cvasc(string3, strlen(string3), &num3))
        {
        printf("Error %d in converting string3 to INT8\n", x);
        exit(1);
        }

    /* notice that digits right of the decimal are truncated. */

    if (x = ifx_int8sub(&num2, &num3, &sum))
        {
        printf("Error %d in subtracting INT8s\n", x);
        exit (1);
      }
    if (x = ifx_int8toasc(&sum, result, sizeof(result)))
        {
        printf("Error %d in converting INT8 result to string\n", x);
        exit(1);
        }
    result[40] = '\0';
    printf("\t%s - %s = %s\n", string2, string3, result); /* display result */
 
    printf("\nIFX_INT8SUB Sample Program over.\n\n");
    exit(0);
}