Rotate the elements of an array in left

Posted on Apr 24, 2020

C program to cyclically permute (rotate) the elements of an array in left.

Program

#include<stdio.h>
#include<conio.h>
#define MAX 50

void read_array(int a[MAX], int n)
{
    int i;
    for(i=0;i<n;i++)
    {
        printf("Element %d\t:",i+1);
        scanf("%d",&a[i]);
    }
}

void print_array(int a[MAX], int n)
{
    int i;
    for(i=0;i<n;i++)
    {
        printf("Element %d\t:%d\n",i+1,a[i]);
    }
}

void rotate_left(int a[MAX], int n, int count)
{
    int i, j, first;

    for(i=0;i<count;i++)
    {
        first = a[0];
        for(j=0;j<n-1;j++)
        {
            a[j] = a[j+1];
        }
        a[n-1] = first;
    }
}

void main()
{
    int arr[MAX];
    int n, count;

    printf("Enter the number of elements in the array\t:");
    scanf("%d",&n);

    printf("Enter the elements of the array\n");
    read_array(arr, n);

    printf("Enter the number of times to rotate left\t:");
    scanf("%d",&count);

    rotate_left(arr, n, count);

    printf("\nRotated array\n");
    print_array(arr, n);

    getch();
}

Output

Enter the number of elements in the array       :8
Enter the elements of the array
Element 1       :12
Element 2       :25
Element 3       :56
Element 4       :69
Element 5       :98
Element 6       :85
Element 7       :54
Element 8       :41
Enter the number of times to rotate left        :4

Rotated array
Element 1       :98
Element 2       :85
Element 3       :54
Element 4       :41
Element 5       :12
Element 6       :25
Element 7       :56
Element 8       :69