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Posted on 1997-03-24
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Last Modified: 2010-04-15
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.
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Question by:jennifer032497
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Expert Comment

by:warren_dale
ID: 1249746
This is obviously a homework assignment. Which parts do you need help on?
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Author Comment

by:jennifer032497
ID: 1249747
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);
}

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Accepted Solution

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jos010697 earned 100 total points
ID: 1249748
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

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Author Comment

by:jennifer032497
ID: 1249749
Thank you Jos for your help.But my main problem is when entering the records of the product. Please consider this point.
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LVL 4

Expert Comment

by:jos010697
ID: 1249750
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
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