Quick Sort Program in C

A simple quick sort program that I wrote a long time ago using C programming language.

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Sample Program Output

 

Program Listing 

 

quick.c

 

#include <stdio.h>
#include <conio.h>


#define maxsize 100

int A[maxsize];

void quicksort(int a, int b)
{
  int rtidx=0,ltidx=0,k=a,l=0,pivot;
  int leftarr[maxsize],rtarr[maxsize];
  pivot=A[a];
  if(a==b)return;
  while(k<b)
  {
    ++k;
     if(A[k]<A[a])
     {
      leftarr[ltidx]=A[k];
      ltidx++;
      }
        else
        {
        rtarr[rtidx]=A[k];
        rtidx++;
         }
          }

     k=a;
     for(l=0;l<ltidx;++l)A[k++]=leftarr[l];
     A[k++]=pivot;
     for(l=0;l<rtidx;++l)A[k++]=rtarr[l];
     if(ltidx>0)quicksort(a,a+ltidx-1);
     if(rtidx>0)quicksort(b-rtidx+1,b);
     }

void printarr(int a)
{
  int i;
  for(i=0;i<a;i++)
  {
  printf(" %d ",A[i]);
  }
  }

main()
{
  int i=0,s=0;
  clrscr();
  printf("\n======================================================");
  printf("\n\t QUICK SORT USING C VERSION 1.0");
  printf("\n Created By: Mr. Jake Rodriguez Pomperada, MAED-IT");
  printf("\n======================================================");
  printf("\n\n");
  printf("How many numbers to process :=> ");
  scanf("%d",&s);
  for(i=0;i<s;i++)
  {
     printf("Enter value No. %d :=> ",i+1);
     scanf("%d",&A[i]);
     }
  printf("\n==========================");
  printf("\n\t  RESULTS ");
  printf("\n==========================");
  printf("\n");
  printf("The Values before sorting ");
  printf("\n");
  printarr(s);
  quicksort(0,s-1);
  printf("\n\n");
  printf("The Values after sorting");
  printf("\n");
  printarr(s);
  getche();
  }