16-digit integers ending with 0 are printed in exponential format

[Hironobu-Ishii]

16-digit integers ending with 0 are printed in exponential format. Non-zero ending cases are printed as expected.

Output from the sample code

cJSON Version: 1.7.15
{
	"OK1":	1234567890123456,
	"OK2":	1234567890123457,
	"OK3":	1234567890123458,
	"OK4":	1234567890123459,
	"NG1":	1.23456789012346e+15,
	"OK5":	1234567890123461,
	"OK6":	1234567890123462,
	"OK7":	1234567890123463,
	"OK8":	1234567890123464,
	"OK9":	1234567890123465,
	"NG2":	1.23456789012347e+15,
	"OK10":	1234567890123471
}

Sample code

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "cJSON.h"

static void create_objects(void)
{
    /* declare a few. */
    cJSON *root = NULL;
    char *out;

    root = cJSON_CreateObject();

    cJSON_AddNumberToObject(root, "OK1", 1234567890123456);
    cJSON_AddNumberToObject(root, "OK2", 1234567890123457);
    cJSON_AddNumberToObject(root, "OK3", 1234567890123458);
    cJSON_AddNumberToObject(root, "OK4", 1234567890123459);
    cJSON_AddNumberToObject(root, "NG1", 1234567890123460);
    cJSON_AddNumberToObject(root, "OK5", 1234567890123461);
    cJSON_AddNumberToObject(root, "OK6", 1234567890123462);
    cJSON_AddNumberToObject(root, "OK7", 1234567890123463);
    cJSON_AddNumberToObject(root, "OK8", 1234567890123464);
    cJSON_AddNumberToObject(root, "OK9", 1234567890123465);
    cJSON_AddNumberToObject(root, "NG2", 1234567890123470);
    cJSON_AddNumberToObject(root, "OK10", 1234567890123471);

    /* Print to text */
    if ((out = cJSON_Print(root)) == 0) {
        cJSON_Delete(root);
        exit(EXIT_FAILURE);
    }
    printf("%s\n", out);
    cJSON_Delete(root);
    return;
}

int main(void)
{
    /* print the version */
    printf("cJSON Version: %s\n", cJSON_Version());

    /* Now some samplecode for building objects concisely: */
    create_objects();

    return 0;
}