Store List

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;
}