1. Write the function int READDIM() that reads and returns a strictly positive integer less than 50;
2. Write the function void READARRAY(int Arr[], int N) that reads N integers of the array Arr;
3. Write the function void DISPLAY(int Arr[], int N) that displays N integers of the array Arr;
4. Write the function void REVERSE(int Arr[], int N, int M) that reverses the order of appearance of the elements of the array Arr that are in position multiple of M;
5. Using all the above written functions, write a main function that reads the effective dimension N of an array by calling READDIM, then lls the array using READARRAY, then displays the array using DISPLAY, then reads a positive integer M strictly less than N, then reverses the elements of the array that are in position multiple of M using REVERSE, then displays the array using DISPLAY.

Running example:

#include<conio.h>
#define SIZE 50

int READDIM()
{
	int n;
	do
	{
		printf("Enter the dimension : ");
		scanf("%d", &n);
	} while (n <= 0 || n>SIZE);
	return n;
}

void READARRAY(int Arr[], int N)
{
	int i;
	printf("Enter %d elements : ", N);
	for (i = 0; i<N; i++)
			scanf("%d", &Arr[i]);
}

void DISPLAY(int Arr[], int N)
{
	int i;
	for (i = 0; i<N; i++)
		printf("%d ", Arr[i]);
}

void REVERSE(int Arr[], int N, int M)
{
	int i, j, aux;

	//last multiple of M
	j = M*((N -1 ) / M);
	i = 0;
	while (i < j)
	{
		aux = Arr[i];
		Arr[i] = Arr[j];
		Arr[j] = aux;
		i += M;
		j -= M;
	}
}



void main()
{
	int N, M;
	int A[SIZE];

	N = READDIM();

	printf("\nReading array (enter %d integer)\n", N);
	READARRAY(A, N);

	printf("\nArray before modification\n");
	DISPLAY(A, N);
 
	do {
		printf("\n\nEnter a value for M: ");
		scanf("%d", &M);
	} while (M<0 || M >= N);


	REVERSE(A,  N,  M);

	printf("\nArray after modification\n");
	DISPLAY(A, N);


	getch();
}