C Exercises: Rotate an array by N positions
C Array: Exercise-39 with Solution
Write a program in C to rotate an array by N positions.
N.B.: The size of first array is (m+n) but only first m locations are populated remaining are empty. The second array is of size equal to n.
Pictorial Presentation:

Sample Solution:
C Code:
#include <stdio.h>
void shiftArr1Pos(int *arr1, int arrSize)
{
int i, temp;
temp = arr1[0];
for(i = 0; i < arrSize-1; i++)
{
arr1[i] = arr1[i+1];
}
arr1[i] = temp;
}
void arr1Rotate(int *arr1, int arrSize, int rotFrom)
{
int i;
for(i = 0; i < rotFrom; i++)
{
shiftArr1Pos(arr1, arrSize);
}
return;
}
int main()
{
int arr1[] = {0,3,6,9,12,14,18,20,22,25,27};
int ctr = sizeof(arr1)/sizeof(arr1[0]);
int i;
//---------- print original array ------------------------
printf("The given array is : ");
for(i = 0; i < ctr; i++)
{
printf("%d ", arr1[i]);
}
printf("\n");
//---------- print the values from 4th position ------------------------
printf("From 4th position the values of the array are : ");
for(i = 4; i < ctr; i++)
{
printf("%d ", arr1[i]);
}
printf("\n");
//---------- print the values before 4th position ------------------------
printf("Before 4th position the values of the array are : ");
for(i = 0; i < 4; i++)
{
printf("%d ", arr1[i]);
}
printf("\n");
//------------ after rotating the array --------------------
arr1Rotate(arr1, ctr, 4);
printf("\nAfter rotating from 4th position the array is: \n");
for(i = 0; i<ctr; i++)
{
printf("%d ", arr1[i]);
}
return 0;
}
Sample Output:
The given array is : 0 3 6 9 12 14 18 20 22 25 27 From 4th position the values of the array are : 12 14 18 20 22 25 27 Before 4th position the values of the array are : 0 3 6 9 After rotating from 4th position the array is: 12 14 18 20 22 25 27 0 3 6 9
Flowchart:

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C Programming: Tips of the Day
C Programming - What is the argument for printf that formats a long?
Put an l (lowercased letter L) directly before the specifier.
unsigned long n; long m; printf("%lu %ld", n, m);
Ref : https://bit.ly/3dIwfkP
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