#include <stdio.h>
#define ARRSIZE 8

unsigned int periods[ARRSIZE] = {0};
unsigned int test[] = {100,100,100};
unsigned int diffy;

unsigned int diff(unsigned int a, unsigned int b);
unsigned int checkgroup(unsigned int a[],unsigned int maxdiff);
void enqueue(unsigned int queue[], unsigned int newvalue, unsigned int arraysize);
void printqueue(unsigned int queue[], unsigned int arrysize);

int main()
{
	unsigned int lastvalue = 0;
	while(1)
	{
		printf("Give 3 numbers in format and max differende X Y Z D:");
		scanf("%d %d %d %d",&test[0],&test[1],&test[2],&diffy);
		lastvalue = checkgroup(test,diffy);
		printf("\n%d\n",lastvalue);
		if(lastvalue != 0)
		{
			enqueue(periods,lastvalue,ARRSIZE);
		}
		printqueue(periods,ARRSIZE);
	}
}

void printqueue(unsigned int queue[], unsigned int arraysize)
{
	int i;
	for(i = 0; i < arraysize; i++)
	{
		printf("%d-",queue[i]);
	}
	printf("\n");
}

void enqueue(unsigned int queue[], unsigned int newvalue, unsigned int arraysize)
{
	int i;
	for(i = arraysize; i > 0; i--)
	{
		queue[i] = queue [i-1];
		//printf("moved %d to %d\n",i-1,i);
	}
	queue[0] = newvalue;
}

unsigned int checkgroup(unsigned int a[],unsigned int maxdiff)
{
	if(diff(a[0],a[1])<maxdiff)
	{
		if(diff(a[0],a[2])<maxdiff)
		{
			if(diff(a[1],a[2])<maxdiff)
			{
				return (a[0]+a[1]+a[2])/3;
			}
		}
	}
	return 0;
}

unsigned int diff(unsigned int a, unsigned int b)
{
	if(a > b)
	{
		return a-b;
	}
	else
	{
		return b-a;
	}
}