Introduction
I have used CodeBlocks compiler for debugging purpose. But you can use any C++ programming language compiler as per your availability.
Write C++ program to left rotate an array
#include <iostream>
#define size 5 // defining Size of the array
using namespace std;
void printArray(int arr[]);
void rotateByOne(int arr[]);
int main()
{
int i, num;
int arr[size];
cout<<"Enter 5 elements array: ";
for(i=0; i<size; i++)
{
cin>>arr[i];
}
cout<<"Enter number of times to left rotate: ";
cin>>num;
// Actual rotation
num = num % size;
// Printing array before rotation
cout<<"Array before rotationn:\n "<<endl;
printArray(arr);
// Rotating array n times
for(i=1; i<=num; i++)
{
rotateByOne(arr);
}
// Printing array after rotation
cout<<"\nArray after rotation: "<<endl;
printArray(arr);
return 0;
}
void rotateByOne(int arr[])
{
int i, first;
// Storing first element of array
first = arr[0];
for(i=0; i<size-1; i++)
{
// Moving each array element to its left
arr[i] = arr[i + 1];
}
// Copying the first element of array to last
arr[size-1] = first;
}
//Printing the given array
void printArray(int arr[])
{
int i;
for(i=0; i<size; i++)
{
cout<<arr[i]<<"\t";
}
}
Result
