Help working with pointers

[satbr]

Hello,


I have a product sales management program where I have a structure for storing product data, another to store customer data and another to store sales data. When I insert a new sale has to be associated with a existing product serial number and the id of a existing customer. How do i guarantee when data products and customers struct are changed the sales struct is updated?

Here's what I have:

typedef struct{

char serialnumber[10]
char description[100]
float price
}stproducts;

typedef struct{
int id;
char name[50]
char adress[100]
int phonenumber
}stcustomers;

typedef struct{
int idcustomersale;
char serialnumberproductsale[10]
float endprice;
}stsales;

int main()
{
   stproducts pr[1000];
   int countproducts =0;
   stcustomers cust[500];
   int countcustomers=0; 
   stsales sal[1000];
   int countsales=0;

}

part of the function insert sale:

void insertsale(stsales sal[], int *countsales, stproduct pr[], int countproduct,stcustomers cust[], int countcustomers)
{
char psale[10];
int number;

 consultproducts(pr, countproducts);
 consultcustomers(cust,countcustomers);
 printf("insert the product serial number of the sale:");
 fgets(psale, sizeof psale, stdin);
 strcpy(sal[*countsales].serialnumberproductsale,psale);
 printf("insert the customer id of the sale:");
 scanf ("%d", &number);
 sal[*countsales].idcustomersale=number;

//....................


}

For example let's imagine that the id field is changed on the customer struct, automatically the customer id associated with the sale (idcustomersale) must also be updated.


please help !!!!

[Matticus]

As Aslaville said in your other thread, "you have to do that yourself."

If a value is changed, and as a result other values have to be updated, it is up to you [the programmer] to ensure all those other fields are updated as needed.

[Matticus]

Cross-posted: c - working with pointers struct automatically updated - Stack Overflow