stock.c

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

#define false 0 //false boolean
#define true 1 // for  true the boolean

struct product
{
    char id[10];   // product code/no.
    char name[20]; // product name
    int quantity;  // remaining quantity of product. Subtract from the original quantity the quantity purchased
    int numSold;   // initially zero, when no purchase yet.
    float price;   // price of one piece of product
    int discount;  // discount for this product
    float sales;   // accumulated sales, total sales for this product
    float value;
};
struct product prod[30]; // the maximum array elements.
int count = 0;           // number of unique products present in stock
FILE *f;                 // for the file pointer

int writeFile();
int readFile();
void disZeroQuant();
void dispHsale();
void purchaseprod();
void deleteprod();
void addProd();
int IDChecker(int i, int j);
void editProd();
int checkID(char id[]);
void displayprod();
void worth();

int main()
{
    int choice;
    count = readFile(); // read file in structure from the text file
    if (count < 0)      // there is no file located.
        printf("Cannot locate file\n");
    do
    {
        printf("\n");
        printf("\t\t\t  ================================\n");
        printf("\t\t\t     Stock Management PROGRAM\n");
        printf("\t\t\t  ================================");

        printf("\n\nPress:");
        printf("\n 1.) Input new product record.");
        printf("\n 2.) Edit a Product.");
        printf("\n 3.) Delete a Product");
        printf("\n 4.) Display all existing product.");
        printf("\n 5.) Make a purchase.");
        printf("\n 6.) Display the product record with highest sale.");
        printf("\n 7.) Display all product with zero quantity");
        printf("\n 8.) Display the total value of stock");
        printf("\n 9.) Exit the program.");
        printf("\nChoice--> ");
        scanf("%d", &choice);
        switch (choice)
        {
        case 1: // add product
            addProd();
            break;
        case 2: // edit data product
            editProd();
            break;
        case 3: // delete a product
            deleteprod();
            break;
        case 4: // display the products
            displayprod();
            break;
        case 5: // make a purchased.
            purchaseprod();
            break;
        case 6:
            dispHsale(); // to display highest sale.
            break;
        case 7:
            disZeroQuant(); // display lowest sale.
            break;
        case 8:
            worth(); // display total value of stock.
            break;
        case 9:
            exit(1);
            break;
        default:
            printf("Your choice is wrong please try again");
            break;
        }
    } while (choice != 9); // infinite loop until the user will choose number8 .
    printf("Thankyou for using this program");
}

int writeFile() // write file function
{
    int i;
    f = fopen("stock.dat", "w"); // ayaw i append; change from f = fopen("stock.dat", "a");
    if (f == NULL)
        writeFile();
    fprintf(f, "%d\n", count);
    for (i = 0; i < count; ++i) // writing all the details from all the function to the text file.
    {
        // Changed
        fputs(prod[i].id, f);
        fprintf(f, "\n");
        fputs(prod[i].name, f);
        fprintf(f, "\n");
        fprintf(f, "%d\n", prod[i].quantity);
        fprintf(f, "%d\n", prod[i].numSold);
        fprintf(f, "%f\n", prod[i].price);
        fprintf(f, "%d\n", prod[i].discount);
        fprintf(f, "%f\n", prod[i].sales);
        fprintf(f, "%f\n", prod[i].quantity * prod[i].price);
        fprintf(f, "\n");

    }
    fclose(f);
    return 0;
}
int readFile() // read file function
{
    int n = 0;
    int i;
    f = fopen("stock.dat", "r");
    if (f == NULL)
        writeFile();
    fscanf(f, "%d\n", &n);
    for (i = 0; i < n; ++i)
    {
        fgets(prod[i].id, 10, f);
        prod[i].id[strlen(prod[i].id) - 1] = 0; // remove new lines
        fgets(prod[i].name, 20, f);
        prod[i].name[strlen(prod[i].name) - 1] = 0; // remove new lines
        fscanf(f, "%d", &prod[i].quantity);
        fscanf(f, "%d", &prod[i].numSold);
        fscanf(f, "%f", &prod[i].price);
        fscanf(f, "%d", &prod[i].discount);
        fscanf(f, "%f", &prod[i].sales);
        fscanf(f, "%f\n\n", &prod[i].value);
        
    }
    fclose(f);
    return n;
}

void disZeroQuant()
{ // for the switch number 7= calling all the product id with zero quantity.
    int i;

    count = readFile(); // call the read function
    printf("\nProducts with zero Quantity: ");
    for (i = 0; i < count; i++)
    {
        if (prod[i].quantity == 0)
        { // printing the highest product.
            printf("\nName of the product: %s \nProduct Id: %s \nQuantity left: %d \nNumber of product sold: %d \nPrice of the product: %.2f \nDiscount of the product: %d %% \nTotal Sales: %.2lf\nTotal value: %f \n", prod[i].name, prod[i].id, prod[i].quantity, prod[i].numSold, prod[i].price, prod[i].discount, prod[i].sales,prod[i].value);
        }
    }
    writeFile();
}
void dispHsale()
{ // to display the highest sale function
    int high, i;
    high = prod[0].numSold;     // getting the first element of the array that has been sold
    for (i = 0; i < count; i++) // loop for the num item sold.
    {
        if (prod[i].numSold > high) // if the element containts the highest sold product.
            high = prod[i].numSold; // it will pass on the high variable.
    }
    printf("\nThe Highest Product Sale is: \n");
    for (i = 0; i < count; i++) // loop to search the highest sold product.
    {
        if (prod[i].numSold == high) // printing the highest product.
            printf("Name of the product: %s \nProduct Id: %s \nQuantity left: %d \nNumber of product sold: %d \nPrice of the product: %.2f \nDiscount of the product: %d %% \nTotal Sales: %.2lf\nTotal value: %f\n", prod[i].name, prod[i].id, prod[i].quantity, prod[i].numSold, prod[i].price, prod[i].discount, prod[i].sales,prod[i].value);
    }
}

void purchaseprod()
{ // function for purchasing a product
    int quant, i;
    char id[10];
    int z = true;
    count = readFile();
    printf("Sell an Item ");
    printf("\nProduct ID: ");
    fflush(stdin);
    gets(id);
    for (i = 0; i < count; i++)
    {
        if (strcmp(id, prod[i].id) == 0) // if the id that the user want to find and the data id that has been saved at file is matched.
        {
            z = false;
            printf("\nItem found! Containing: \n"); //...then display the match
            printf("\nProduct name: %s", prod[i].name);
            printf("\nPrice: %.2lfphp\n\n", prod[i].price);

            printf("Enter the quantity you want to buy  : ");
            fflush(stdin);
            scanf("%d", &quant);
            if (quant > prod[i].quantity)
            { // if the quantity is lessthan the users quant
                puts("\nInsufficient Quantity\nPlease Restock.\n ");
                break; // break and back to the choices.
            }

            float tempSales = prod[i].sales; // will be executed if the quantity is greater than the users selected quantity.
            prod[i].numSold += quant;
            prod[i].quantity -= quant;
            prod[i].sales = quant * (prod[i].price * (prod[i].discount / 100.0));
            prod[i].sales += tempSales;
        }
    }
    if (z == true)
    { // if the product id is not available.

        printf("Cant find the product id: %s.", id);
    }
    writeFile();
}
void deleteprod()
{ // function for the delete product.
    count = readFile();
    char id[10];
    int i, j;
    int z = true;
    printf("Enter the id that you want to be delete : "); // user's input for deleting.
    fflush(stdin);
    gets(id);

    for (i = 0; i < count; i++)
    { // loop to finding the user's input
        z = false;
        if (strcmp(prod[i].id, id) == 0)
        {                                     // if the user's input matched the data
            for (j = i; j < (count - 1); j++) // it will erase the selected data.
            {
                prod[j] = prod[j + 1];
            }
            count--;
        }
    }
    if (z == true)
    { // will be executed if the product id is not available.
        printf("Cant find product id: %s .", id);
    }
    writeFile();
}

void addProd()
{ // function to add products to the file

    printf("ENTER NEW PRODUCTS\n");
    readFile(); // reading the files .
    if (count > 0)
    {
        count = readFile();
        IDChecker(0, count); // to check if the id is already used.
    }
    else
    {
        printf("\nProduct ID Number: ");
        fflush(stdin);
        gets(prod[count].id);
    }
    printf("Product Name: ");
    gets(prod[count].name);
    printf("Quantity of the product: ");
    scanf("%d", &prod[count].quantity);
    printf("Price of the product: ");
    scanf("%f", &prod[count].price);
    printf("Item Discount: ");
    scanf("%d", &prod[count].discount);
    ++count; // increment count for the product positions and how many are they in the array.

    writeFile(); // putting/saving this to the file.
}

int IDChecker(int i, int j) // checking the input id
{
    count = readFile();
    printf("Product ID: ");
    fflush(stdin);
    gets(prod[count].id);
    if (strcmp(prod[i].id, prod[j].id) == 0)
    {
        printf("ID number is already taken!");
        return IDChecker(i++, j--);
    }
}

void editProd()
{ // Editing the product function
    char id[10];
    int test;
    int i;
    int choice;
    printf("EDIT A PRODUCT!");
    printf("\nEnter the id of the product that you want to edit: "); // users input for what data will be change
    fflush(stdin);
    gets(id);
    test = checkID(id);
    if (test == 0)
    {
        printf("The id num %s is not found.", id); // if the data is empty
    }
    else
    {
        readFile();
        {
            for (i = 0; i < count; i++)
            {

                if (strcmp(id, prod[i].id) != 0) // if the data is not empty
                    writeFile();
                else
                {
                    printf("\n1. Update product ID Number?");
                    printf("\n2. Update Name of the product? ");
                    printf("\n3. Update Quantitiy of the product?");
                    printf("\n4. Update Price of the product?");
                    printf("\n5. Update Discount of the product?");
                    printf("\nEnter your choice:");
                    fflush(stdin);
                    scanf("%d", &choice);

                    switch (choice)
                    {
                    case 1:

                        printf("Enter new ID: ");
                        fflush(stdin);
                        gets(prod[i].id);
                        break;
                    case 2:
                        printf("Enter new Name: ");
                        fflush(stdin);
                        gets(prod[i].name);
                        break;
                    case 3:
                        printf("Enter Quantity: ");
                        scanf("%d", &prod[i].quantity);
                        break;
                    case 4:
                        printf("Enter the new price: ");
                        scanf("%f", &prod[i].price);
                        break;
                    case 5:
                        printf("Enter the new discount of the product: ");
                        scanf("%d", &prod[i].discount);
                    default:
                        printf("Invalid Selection");
                        break;
                    }
                    writeFile();
                }
            }
        }
        fclose(f);
        f = fopen("stock.dat", "r");
        readFile();
        {
            writeFile();
        }
        fclose(f);
        printf("RECORD UPDATED");
    }
}

int checkID(char id[])
{ // checking the id if available
    int i;
    count = readFile();

    readFile();
    for (i = 0; i < count; i++)
    {

        if (strcmp(id, prod[i].id) != 0)
        { // if the id and data id doesnt match.

            fclose(f);
        }
        return 1; // returning an error.
    }

    fclose(f);
    return 0; // return 0 if no error.
}

void displayprod()
{   writeFile();
    int i;

    count = readFile(); // the output is how many products inside the file.
    if (count < 0)
        puts("cannot open file");
    printf(" \t\t\t\t\t *****  STOCK *****\n");
    printf("----------------------------------------------------------------------------------------------------\n");
    printf("S.N.|    NAME     |  PROD ID  |  QUANTITY | PROD SOLD |  PRICE  | DISCOUNT | SALES |     VALUE     |\n");
    printf("----------------------------------------------------------------------------------------------------\n");

    for (i = 0; i < count; i++)
    { // getting the details on each product updates.
        printf("%d     %-10s     %-8s       %-5d      %-3d       %-6.2f    %-5d%%    P%.2lf      %.2f\n", i + 1, prod[i].name, prod[i].id, prod[i].quantity, prod[i].numSold, prod[i].price, prod[i].discount, prod[i].sales,prod[i].value);
    }
}

void worth(){
    float sum = 0;
    for(int i=0;i<30;i++){
        sum = sum + prod[i].value;
    }
    printf("The total value of the current stock is: %.2f\n",sum);
}