Write the NUM function of the type int which obtains an integer value N (positive or negative) of the long type as a parameter and which gives the number of digits of N as a result.

Write a small program that tests the function NUM.

Example:

          Enter an integer number: 6457392

          The number 6457392 has 7 digits.

#include <stdio.h>
#include <conio.h>

int digits(long N)
{
	/* N can be modified in the function
		since it is passed by copy. */
	int i;
	/* modify the sign if N is negative */
	if (N<0)
		N *= -1;
	/* count the digits */
	for (i = 1; N>10; i++)
		N /= 10;
	return i;
}
void main()
{
	long A;

	printf("Enter an integer : ");
	scanf("%ld", &A);
	printf("The number %ld have %d digits.\n", A, digits(A));

	getch();
}