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C program to implement Comb sort algorithm

Here, we are going to learn how to implement Comb sort algorithm using C program?
Submitted by Nidhi, on August 17, 2021

Problem Solution:

Here, we will create an array of integers then we will read array elements from the user and implement the Comb sort algorithm to arrange array elements in ascending order.

Program:

The source code to implement the Comb sort algorithm is given below. The given program is compiled and executed using GCC compile on UBUNTU 18.04 OS successfully.

// C program to implement Comb sort algorithm

#include <stdio.h>

#define MAX 5

int newgap(int gap)
{
    gap = (gap * 10) / 13;
    if (gap == 9 || gap == 10)
        gap = 11;

    if (gap < 1)
        gap = 1;

    return gap;
}

void CombSort(int arr[])
{
    int gap = MAX;
    int temp = 0;
    int swapped = 0;

    int i = 0;
    int j = 0;

    while (1) {
        gap = newgap(gap);

        swapped = 0;
        i = 0;
        while (i < MAX - gap) {
            j = i + gap;
            if (arr[i] > arr[j]) {
                temp = arr[i];
                arr[i] = arr[j];
                arr[j] = temp;
                swapped = 1;
            }
            i++;
        }
        if (gap == 1 && !swapped)
            break;
    }
}

int main()
{
    int i = 0;
    int arr[MAX];

    printf("Enter array elements:\n");
    while (i < MAX) {
        printf("Element[%d]: ", i);
        scanf("%d", &arr[i]);
        i++;
    }

    CombSort(arr);

    printf("Sorted Array: \n");
    i = 0;
    while (i < MAX) {
        printf("%d ", arr[i]);
        i++;
    }
    printf("\n");

    return 0;
}

Output:

RUN 1:
Enter array elements:
Element[0]: 24
Element[1]: 54
Element[2]: 38
Element[3]: 18
Element[4]: 87
Sorted Array: 
18 24 38 54 87

RUN 2:
Enter array elements:
Element[0]: 10
Element[1]: 20
Element[2]: 40
Element[3]: 5
Element[4]: 15
Sorted Array: 
5 10 15 20 40 

Explanation:

Here, we created three functions newgap(), CombSort(), and main(). The newgap(), CombSort() functions are responsible to implement Comb sort algorithm.

In the main() function, we read array elements from the user. Then we sorted the elements of the array in ascending order using the CombSort() function and print the sorted array on the console screen.

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