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Program 337 : Quick Sort

Program 337 : Quick Sort
 
#include<stdio.h>
void QuickSort(int array[],int start,int end);
main()
{
 int i,j,array[100],num;
 printf("Enter Number of Elements in Array\n");
 scanf("%d",&num);
 printf("Enter Elements of Array\n");
 for(i=0;i<num;i++)
 scanf("%d",&array[i]);
 QuickSort(array,0,num);
 printf("Array after Sorting\n");
 for(i=0;i<num;i++)
 printf("%d ",array[i]);
 printf("\n");
}

void QuickSort(int array[],int start,int end)
{
 int index=start,i,pivot=array[end],temp;//taking the last number in array as pivot
 if(start<end)
 {
  for(i=start;i<end;i++)
  {
   if(array[i]<=pivot)//swapping index element and element at ith position if ith element is lesser than pivot element
   {
    temp=array[i];
    array[i]=array[index];
    array[index]=temp;
    index++;
   }
  }
  //finally after this loop we will get the position to interchange the pivot with index so that all the
  //elements greater than pivot wil be right side and lesser than pivot will be left side
  temp=array[index];
  array[index]=array[end];//we are taking  end element as pivot every time the quick sort function is called
  array[end]=temp;
  QuickSort(array,start,index-1);
     QuickSort(array,index+1,end);
 }
 
 
}


Explanation:
//Coming Soon

Output: 
Quick Sort





 

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