• C

structure

Write a program that uses the qsort() function to sort an array of structures of type PRODUCT.Each product record has the following fields :-
Product category(string)
Product code(int)
Description(string)
Unit Cost(float)
quantity(long int)
The array is to be sorted in alphabetical order according to the product category.In situation where there are similar product category, then the records involved should be sorted according to product code in ascending order.
jennifer032497Asked:
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

x
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

warren_daleCommented:
This is obviously a homework assignment. Which parts do you need help on?
0
jennifer032497Author Commented:
Below is what i have worked on. Please help me to debug.

#include<stdio.h>
#include<string.h>
#include<stdlib.h>
#define SIZE 10

typedef struct
{
  char *category;
  int code;
  char *desc;
  float cost;
  long quantity;
}PRODUCT;

int str_cmp ();
int code_cmp ();

main ()
{
  PRODUCT record [SIZE];
  int x, num;
  clrscr();
  printf("Enter number of record [ max 10 ] : ");
  scanf("%d",&num);
  clrscr();
  printf("DATA ENTRY\n");
  printf("==========\n\n");
  for (x=0; x<num; x++)
  {
    printf("Product Category : ");
    scanf("%s",record[x].category);
    printf("\nProduct Code     : ");
    scanf("%d",&record[x].code);
    printf("\nDescription      : ");
    scanf("%s",record[x].desc);
    printf("\nUnit Cost        : ");
    scanf("%f",&record[x].cost);
    printf("\nQuantity         : ");
    scanf("%ld",&record[x].quantity);
    printf("\n\n=========================");
    printf("============================\n\n");
  }
  qsort(record,num,sizeof(PRODUCT),str_cmp);
  qsort(record,num,sizeof(PRODUCT),code_cmp);
  clrscr();
  gotoxy(20, 0);
  printf("SORTED RECORD\n");
  gotoxy(20, 1);
  printf("*************\n\n");
  printf("Category\tCode\tDescription\tCost\tQty\n");
  printf("=================================");
  printf("===================\n");
  for(x=0; x<num; x++)
  {
    printf("%s\t%d\t%s\t%f\t%d\n",record[x].category,
      record[x].code,record[x].desc,record[x].cost,
      record[x].quantity);
  }
  getch();
}

int str_cmp(PRODUCT *p1,PRODUCT *p2)
{
  return(strcmp(p1->category,p2->category));
}

int code_cmp(PRODUCT *n1,PRODUCT *n2)
{
  return(n1->code-n2->code);
}

0
jos010697Commented:
It all boils down to the comparison function, used by the
qsort() routine. Here's an example:

int comp(const void* a, const void* b) {

const product* pa= a; /* use product* for convenience *.
const product* pb= b;

int r; /* comparison result */

r= strcmp(pa->category, pb->category);

if (r) /* categories are different */
   return r;

/* compare codes if categories compare equal */
if (pa->code > pb->code)
   return 1;

if (pa->code < pb->code)
   return -1;

return 0;

}

kind regards,

Jos aka jos@and.nl

0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
jennifer032497Author Commented:
Thank you Jos for your help.But my main problem is when entering the records of the product. Please consider this point.
0
jos010697Commented:
Ah, but that's not what you asked for (see your original
question above).

Hint: have a look at e.g. the category member: it's
a pointer to a character (string), but it doesn't point
to anything (same for the 'description' member).

kind regards,

Jos aka jos@and.nl
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
C

From novice to tech pro — start learning today.