5a)

typedef struct
{
	char pName[31];
	float cost, retail;
}product_t;

5b)

// Read the number of stores and details of each store 
// into array storeList.
// Return the number of stores.
int readStores(store_t storeList[]) 
{
	int numStores, i, j;
	FILE * fp;
	
	fp = fopen("stores.in", "r");
	
	/* Read number of stores */
	fscanf(fp, "%d", &numStores);
	
	/* For each Store */
	for(i = 0; i < numStores; i++)
	{
		fscanf(fp, "%s %d %d %f %d", storeList[i].sname, &storeList[i].x, &storeList[i].y, &storeList[i].radius, &storeList[i].numProduct);
		
		/* For each product */
		for(j=0; j<storeList[i].numProduct; j++)
			fscanf(fp, "%s %f %f", storeList[i].products[j].pName, &storeList[i].products[j].cost, &storeList[i].products[j].retail);
	}
	
	fclose(fp);
	
	return numStores;	
}

5c)

// Return 1 if user is within store's radius of influence, 
// or 0 otherwise.
int withinRadius(int x, int y, store_t store) 
{
	float distance = sqrt(pow(store.x - x, 2) + pow(store.y - y, 2));
	
	return (store.radius >= distance);
}


5d)

// Print the names of stores where the user's current 
// location is within their circles of influence.
void printNearbyStores(int x, int y, store_t storeList[], int numStore) 
{
	int i;
	
	for(i = 0; i < numStore; i++)
		if(withinRadius(x, y, storeList[i]))
			puts(storeList[i].sname);
}

5e)

// Find and label the products that are good buys. 
// You are to decide on the return type and parameters of 
// this function.
/* Return "void" as functions objective is to just label */
void labelGoodBuys(store_t storeList[], int numStore) 
{
	int i, j;
	float difference;
	
	/* For each store */
	for(i = 0; i < numStore; i++)
	{
		/* For each product */
		for(j = 0; j < storeList[i].numProduct; j++)
		{
			difference = storeList[i].products[j].retail - storeList[i].products[j].cost;
			
			if(difference <= (0.05 * storeList[i].products[j].cost))
				strcat(storeList[i].products[j].pName, "***Must Buy***");
		}
	}
}

5f)

// Determine which store has the lowest retail price 
// for a given product. You are to decide on the 
// return type and parameters of this function.
int findCheapestStore(char productName[], store_t storeList[], int numStore) 
{
	int i, j, storeIndex;
	char newProductName[31];
	float lowestRetail = 1001;
	
	/* If product name has label.. */
	strcpy(newProductName, productName);
	strcat(newProductName, "***Must Buy***");
	
	/* For each store */
	for(i = 0; i < numStore; i++)
	{
		/* For each product */
		for(j = 0; j < storeList[i].numProduct; j++)
		{
			/* Check for matching product name with or w/o label */
			if(strcmp(productName, storeList[i].products[j].pName) == 0 || strcmp(newProductName, storeList[i].products[j].pName) == 0)
			  {
				if(storeList[i].products[j].retail < lowestRetail)
					storeIndex = i;		
			  }
		}
	}
	
	return storeIndex;
}