Quick Sort Program in C Using Recursion

In this Searching and Sorting in C, we will have a look at how to write a quick sort program in C using recursion.

Quick Sort Program in C Using Recursion

#include<stdio.h>
void quick_sort(int[],int,int);
int partition(int[],int,int);
int main()
{
int a[50],n,i;
printf("How many 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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