c - Problem with either reading or update my random access file

Question

I write this program to imitate a cash register and have the data for the stock currently in shop,the problem arise whenever i put the code = 10, when i use the function to read it, the program behave unexpectedly.the code = 10 is put at Update_storage function in itemlist.code variable while the reading part happen at read_storage function. I will attach the full code just in case the problem happen because of another function etc

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

void Update_storage();
void read_storage();
void Create_File();
float send_price();
float checkout(float paid);
void display_receipt(float amountpaid,float baki);

int dataz;
int z;
int namez[100];
float pricez[100];
int quanz[100];

struct Storage{
    int code;
    char item_name[100];
    float price;
    int qty;
};

int main()
{
    int choice, menu,qtyx,moreitem,comfirmation;
    float y,a;
    float sumprice = 0.0;
    float totalprice = 0.0;

    printf("Input any digit(from 1-10) to start the program
");
    printf("!!!       If you want to exit input 0       !!!
");
    scanf("%d", &menu);
    system("cls");

    while(menu != 0)
    {
        printf("|***Welcome to Cash Register Prototype-0***|
");
        printf("|     Nice to be working with you!^_^      |
");
        printf("|------------------------------------------|
");
        printf("|  Please choose what you would like to do |
");
        printf("|(1)Update storage                  |
");
        printf("|(2)Read   storage                  |
");
        printf("|(3)Create storage*!!!WARNING!!!*   |
");
        printf("|(4)Customer payment system         |
");
        printf("|------------------------------------------|
");
        printf("*!!!WARNING!!!*USE ONLY FOR 1ST TIME RUNNING THIS PROGRAM
");
        printf("-------->");
        scanf("%d", &choice);
        system("cls");

        if(choice == 1){
            Update_storage();
        }else if (choice == 2){
            read_storage();
        }else if (choice == 3){
            printf("
Choosing to proceed with this option will result in lost of data in storage if this is not your 1st use
");
            printf("(1)Continue
(2)Return
----->");
            scanf("%d", &comfirmation);

            if(comfirmation == 1)
            {
                Create_File();
            }

        }else if (choice == 4){

            moreitem = 1;
            dataz = 0;

            while(moreitem == 1)
            {
                y = send_price();

                printf("Please enter the quantity of the item:");
                scanf("%d", &qtyx);

                quanz[dataz] = qtyx;
                sumprice = y * qtyx;
                pricez[dataz] = sumprice;
                totalprice = totalprice + sumprice;

                printf("Is there any other item in the cart: 1(YES) 2(NO)
 ----->");
                scanf("%d", &moreitem);

                if(moreitem == 1)
                {
                    dataz++;
                }
            }

            a = checkout(totalprice);
            display_receipt(totalprice,a);

        }else{
            printf("Invalid Option");
        }

        totalprice = 0.0;

        printf("

***Please Input (1)CONTINUE (0)EXIT***

");
        scanf("%d", &menu);
        system("cls");
    }

    printf("Hope to see you again in the future!!!!");

    return 0;
}

void Create_File()
{

    int i = 0;

    struct Storage Item = {0," ",0.0,0};

    FILE *pfcd = fopen("Item List.txt", "w+");

    while(i < 100){
        i++;

        fwrite(&Item, sizeof(struct Storage),1, pfcd);
        }

    fclose(pfcd);
}

void Update_storage()
{
    struct Storage itemlist;
    FILE *Cftpr;

    printf("Things to remember:
");
    printf("(1)put this sign '_' instead of blank space for the item name(ex:Coca_Cola)
");
    printf("(2)Input code = 0 to exit
");
    printf("(3)Put the data arrangement as shown below");
    printf("
Item_Name -> Price -> Quantity
");

    if((Cftpr = fopen("Item List.txt", "r+"))== NULL)
        printf("file cannot be open");
    else{
            printf("Code
");
            scanf("%d", &itemlist.code);

            while(itemlist.code != 0){
                printf("
Item_Name ->  Price -> Quantity
");
                scanf("%s%f%d", &itemlist.item_name, &itemlist.price, &itemlist.qty);
                fseek(Cftpr, (itemlist.code - 1)*sizeof(struct Storage),SEEK_SET);
                fwrite(&itemlist, sizeof(struct Storage), 1, Cftpr);
                printf("
Code
");
                scanf("%d", &itemlist.code);
            }
    }
    fclose(Cftpr);
}

void read_storage()
{

    struct Storage itemlist;
    int loop;
    FILE *Cftpr;

    if((Cftpr = fopen("Item List.txt", "r")) == NULL)
        printf("File cant be open");
    else{
        printf("|-------------------------------------------|");
        printf("
| *****ITEM INVENTORY*****           |
");
        printf("|-------------------------------------------|
");
        printf("|%-6s%-16s%-11s%10s|
","code" ,"item_name" ,"price" ,"quantity" );
        printf("|-------------------------------------------|
");

        for(loop = 1 ; loop <= 100; loop++){
            fread(&itemlist, sizeof(struct Storage), 1, Cftpr);
            if(itemlist.code != 0)
                printf("|%-6d%-16s%-11.2f%6d    |
",itemlist.code ,itemlist.item_name ,itemlist.price ,itemlist.qty);
        }

        printf("|-------------------------------------------|
");
    }

        fclose(Cftpr);
}

float send_price()
{
    int codex;
    float pricex;
    struct Storage itemlist;
    FILE *senderboi;

    printf("Enter the code:");
    scanf("%d", &codex);

    namez[dataz] = codex;

    senderboi = fopen("Item List.txt", "r+");

    fseek(senderboi, (codex - 1)*sizeof(struct Storage),SEEK_SET);
    fread(&itemlist, sizeof(struct Storage), 1, senderboi);
    printf("|-------------------------------------|
");
    printf("|%-6s%-16s%11s    |
", "code", "Product name", "Price");
    printf("|-------------------------------------|
");
    printf("|%-6d%-16s%11.2f    |
",itemlist.code ,itemlist.item_name ,itemlist.price, itemlist.qty);
    printf("|-------------------------------------|
");

    fclose(senderboi);

    pricex = itemlist.price;

    return(pricex);
}

float checkout(float paid)
{
    float taxincluded,change,amount;

    taxincluded = paid * 1.06;

    printf("

The total amount you need to pay is : %.2f
", taxincluded);
    printf("///  SST is included in the shown price  ///

");

    printf("Enter the amount of money give by customer:");
    scanf("%f", &amount);

    change = amount - taxincluded;

    printf("Amount Given    : %.2f
", amount);
    printf("Change          : %.2f




", change);

    return(change);
}

void display_receipt(float amountpaid,float baki)
{
    float sstpaid;
    float bayar;
    FILE *receiptboii;
    struct Storage Receipt;

    amountpaid = amountpaid * 1.06;
    sstpaid = 0.06 * (amountpaid / 1.060);
    bayar = baki + amountpaid;

    receiptboii = fopen("Item List.txt", "r+");


        printf("         |---------------------------------------------|
");
        printf("         |FLASH MART MALAYSIA BERKUMPULAN TAKDA HAD INK|
");
        printf("         |Company No.: 1-388-2525                      |
");
        printf("         |SST No     : P1Z00-1907-130082020            |
");
        printf("         |tax receipt: s23ok-jebat                     |
");
        printf("         |---------------------------------------------|
");
        printf("         |%6s %16s%16s      |
","qty", "Product", "Price");
        printf("         |---------------------------------------------|
");

    for(z = 0; z <= dataz;z++)
    {
        fseek(receiptboii, (namez[z] - 1)*sizeof(struct Storage),SEEK_SET);
        fread(&Receipt, sizeof(struct Storage), 1, receiptboii);
        printf("         |%4dx%17s%14s%-5.2f    |
",quanz[z], Receipt.item_name, "RM", pricez[z]);
    }

        printf("         |---------------------------------------------|
");
        printf("         |           SST included    :RM %-6.2f        |
", sstpaid);
        printf("         |           Total Amount is :RM %-6.2f        |
",amountpaid);
        printf("         |           Paid amount     :RM %-6.2f        |
",bayar);
        printf("         |           Change          :RM %-6.2f        |
",baki);
        printf("         |---------------------------------------------|
");
        printf("         |        THANK YOU FOR SUPPORTING US          |
");
        printf("         |     ALWAYS GIVE YOUR BEST TO TEACH US       |
");
        printf("         | ALTHOUGH WE NEVER SEE EACH OTHER FACE 2 FACE|
");
        /*printf("         |stil reading this?what are you expect to see?|
");
        printf("         | if you are still reading this i just want to|
");
        printf("         | ask you why? there is is nothing left here  |
");
        printf("         |    did you know there is 2 is there?        |
");*/
        printf("         |---------------------------------------------|
");

    fclose(receiptboii);


    return;
}

question from:https://stackoverflow.com/questions/65925141/problem-with-either-reading-or-update-my-random-access-file

Answer 1

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