Question

How to cyclically rotate the elements of int array left N times in C++

Answer 1

#include <iostream>

void rotate_array_left_one_time(int arr[], int arr_size) {
    int first = arr[0];
 
    for (int i = 0; i < arr_size - 1; i++) {
        arr[i] = arr[i + 1];
    }
    
    arr[arr_size - 1] = first;
}
 
int main() {
    int arr[] = {4, 7, 2, 9, 3};
    int arr_size = sizeof(arr)/sizeof(arr[0]);
    int n_times = 3;
 
    for (int i = 0; i < n_times; i++)
        rotate_array_left_one_time(arr, arr_size);
     
    for (int i = 0; i < arr_size; i++) {
        std::cout << arr[i] << " ";
    }
}


 
 
/*
run:
 
9 3 4 7 2 
 
*/

 

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