hyunmoon

#include <stdio.h>
#include <stdlib.h>
 
int main(void)
{
    int n = 4; // size of rectangular 2d array
    int array[4][4] = {
        { 1, 2, 3, 4 },
        { 5, 6, 7, 8 },
        { 9, 10, 11, 12 },

hyunmoon

#include <stdio.h>
#include <stdlib.h>
 
/* rotate array to the left by n elements */
void rotate_array_left(int array[], int size, int n) {
	int *tmp_array = (int*)malloc(n * sizeof(int));
	memcpy(tmp_array, array, n * sizeof(int)); // temporarily save leading n elements
	memmove(array, array + n, (size - n) * sizeof(int)); // shift array to the left
	memmove(array + size - n, tmp_array, n * sizeof(int)); // append saved
	free(tmp_array);