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Write a C Program to implement Quick Sort using recursion

robaa
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2022-11-25
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Write a C Program to implement Quick Sort using recursion. Here’s simple Program to implement Quick Sort using recursion in C Programming Language.

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robaa
2022-11-25
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Recursion : :

  • Recursion is the process of repeating items in a self-similar way. In programming languages, if a program allows you to call a function inside the same function, then it is called a recursive call of the function.
  • The C programming language supports recursion, i.e., a function to call itself. But while using recursion, programmers need to be careful to define an exit condition from the function, otherwise it will go into an infinite loop.
  • Recursive functions are very useful to solve many mathematical problems, such as calculating the factorial of a number, generating Fibonacci series, etc.

Problem : :

The following C program, using recursion, performs quick sort. A quick sort is a sorting algorithm with complexity of O( nlogn ). It is used for sorting numbers, structure, files.

 
 

Here is the source code of the C Program to implement Quick Sort using recursion. The C Program is successfully compiled and run on a Windows system. The program output is also shown below.

SOURCE CODE : 

/*  C Program to implement Quick Sort using recursion  */

#include <stdio.h>

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

int main()
{
    int list[50];
    int size, i;

    printf("How many elements u want to Sort :: ");
    scanf("%d", &size);

    printf("\nEnter the elements below to be sorted :: \n");

    for (i = 0; i < size; i++)
    {
         printf("\nEnter [ %d ] element :: ",i+1);
        scanf("%d", &list[i]);
    }

    quicksort(list, 0, size - 1);

    printf("\nAfter implementing Quick sort, Sorted List is :: \n\n");

    for (i = 0; i < size; i++)
    {
        printf("%d  ", list[i]);
    }

    printf("\n");

    return 0;
}

void quicksort(int list[], int low, int high)
{
    int pivot, i, j, temp;
    if (low < high)
    {
        pivot = low;
        i = low;
        j = high;
        while (i < j)
        {
            while (list[i] <= list[pivot] && i <= high)
            {
                i++;
            }
            while (list[j] > list[pivot] && j >= low)
            {
                j--;
            }
            if (i < j)
            {
                temp = list[i];
                list[i] = list[j];
                list[j] = temp;
            }
        }
        temp = list[j];
        list[j] = list[pivot];
        list[pivot] = temp;
        quicksort(list, low, j - 1);
        quicksort(list, j + 1, high);
    }
}

Output : : 

/*  C Program to implement Quick Sort using recursion  */

How many elements u want to Sort :: 8

Enter the elements below to be sorted ::

Enter [ 1 ] element :: 3

Enter [ 2 ] element :: 1

Enter [ 3 ] element :: 5

Enter [ 4 ] element :: 2

Enter [ 5 ] element :: 8

Enter [ 6 ] element :: 0

Enter [ 7 ] element :: 6

Enter [ 8 ] element :: 9

After implementing Quick sort, Sorted List is ::

0  1  2  3  5  6  8  9

Process returned 0

Above is the source code for C Program to implement Quick Sort using recursion which is successfully compiled and run on Windows System.The Output of the program is shown above .

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