C Program to implement Quick Sort

-

Simple C Program to implement Quick Sort Algorithm

Code:

#include <stdio.h>

void quick_sort(int[],int,int);

int partition(int[],int,int);


int main()

{

int a[50],n,i;

printf("Number of elements: ");

scanf("%d",&n);

printf("\nEnter array elements:");



for(i=0;i<n;i++)

scanf("%d",&a[i]);



quick_sort(a,0,n-1);

printf("\nArray after sorting:");



for(i=0;i<n;i++)

printf("%d ",a[i]);



return 0;

}



void quick_sort(int a[],int l,int u)

{

int j;

if(l<u)

{

j=partition(a,l,u);

quick_sort(a,l,j-1);

quick_sort(a,j+1,u);

}

}



int partition(int a[],int l,int u)

{

int v,i,j,temp;

v=a[l];

i=l;

j=u+1;



do

{

do

i++;



while(a[i]<v&&i<=u);



do

j--;

while(v<a[j]);



if(i<j)

{

temp=a[i];

a[i]=a[j];

a[j]=temp;

}

}while(i<j);



a[l]=a[j];

a[j]=v;



return(j);

}

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