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[QUOTE="yong, post: 2453165"]
I rewrite my code and it seems run correctly now.

main.c
===================
#include <stdio.h>
#include <stdint.h>
#include <math.h>
#include "compress.h"

int main()
{
	struct code6 mycode6;
	struct code5 mycode5;

mycode6.item1=1;
	mycode6.item2=2;
	mycode6.item3=3;
	mycode6.item4=4;
	mycode6.item5=5;
	mycode6.item6=6;

mycode5=codecompress(mycode6);

printf("mycode5.item1 is: %d\n",mycode5.item1);
	printf("mycode5.item2 is: %d\n",mycode5.item2);
	printf("mycode5.item3 is: %d\n",mycode5.item3);
	printf("mycode5.item4 is: %d\n",mycode5.item4);
	printf("mycode5.item5 is: %d\n",mycode5.item5);
	
	return 0;
}
===================

compress.h
===================
#include <stdint.h>

struct code6
{
	unsigned long item1;
	unsigned long item2;
	unsigned long item3;
	unsigned long item4;
	unsigned long item5;
	unsigned long item6;
};

struct code5
{
	unsigned long item1;
	unsigned long item2;
	unsigned long item3;
	unsigned long item4;
	unsigned long item5;
};

struct code5 codecompress(struct code6 origcode)
{
	struct code5 ret;
	uint64_t math64;

math64=origcode.item1*((uint64_t)pow(256,5))+origcode.item2*((uint64_t)pow(256,4))+origcode.item3*((uint64_t)pow(256,3))+origcode.item4*((uint64_t)pow(256,2))+origcode.item5*256+origcode.item6;

ret.item5=(math64)%(uint64_t)900;
	math64/=900;
	ret.item4=(math64)%900;
	math64/=900;
	ret.item3=(math64)%900;
	math64/=900;
	ret.item2=(math64)%900;
	math64/=900;
	ret.item1=(math64)%900;
	
	return ret;
}
===================

Thank you all.   :]
[/QUOTE]

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