Need help on updating/editing user input (array of structures/functions)

**Seregris** · 09-29-2019

My structure:

Code:

typedef struct{
    int day;
    int month;
    int year;
}full_date;


typedef struct{
    int prod_no;
    char prod_name[30];
    char prod_brand[30];
    int quantity;
    float price;
    full_date date_added;
}inventory;

What I want is for only price and quantity to be edited/updated.

My UpdateProduct function:

Code:

void UpdateProduct(inventory *prod[], int size){
    
     int prod_num;
    
    
    printf("Note: Only Quantity and Price can be updated.");
    
    printf("Enter product # of specified product to update: ");
    scanf("%d",&prod_num);
    
    printf("Enter new price: ");
    scanf("%f",&prod[prod_num]->price);
    
    printf("Enter new quantity: ");
    scanf("%d",&prod[prod_num]->quantity);
    
    
    
}

in main() I declared the structure as "inventory prod[size]"

The error/warning I get from the compiler is "undefined reference to UpdateProduct(inventory*, int)'"

Am I supposed to make prod a pointer in main and on all my other functions?

**laserlight** · 09-29-2019

I'd start by changing this:

Code:

typedef struct{
    int prod_no;
    char prod_name[30];
    char prod_brand[30];
    int quantity;
    float price;
    full_date date_added;
}inventory;

To this:

Code:

typedef struct {
    int prod_no;
    char prod_name[30];
    char prod_brand[30];
    int quantity;
    float price;
    full_date date_added;
} product;

typedef struct {
    product *products;
    int size;
} product_inventory;

Now, your function becomes:

Code:

void UpdateProduct(product_inventory *inventory)

In main, you would write:

Code:

product_inventory inventory;
inventory.size = 123; // for example
inventory.products = malloc(sizeof(inventory.products[0]) * inventory.size);
// ...
UpdateProduct(&inventory);
// ...
free(inventory.products);

If you have not learnt about malloc and free, then it is even easier: just declare products to be an array with a fixed size, then use size to denote the number of elements in use.

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