Task

Write a function/procedure/subroutine that is called with an integer value and returns the middle three digits of the integer if possible or a clear indication of an error if this is not possible.

Note: The order of the middle digits should be preserved.

Your function should be tested with the following values; the first line should return valid answers, those of the second line should return clear indications of an error:

123, 12345, 1234567, 987654321, 10001, -10001, -123, -100, 100, -12345
1, 2, -1, -10, 2002, -2002, 0

Show your output on this page.




string middlethree(int i) {
	i = abs(i);
	int length = sizeof((string)i);
 
	if(length >= 3) {
		if(length % 2 == 1) {
			int middle = (int)floor(length / 2) - 1;
			return(((string)i)[middle..middle+2]);
		}
		else {
			return "The value must contain an odd amount of digits...";
		}
	}
	else {
			return "The value must contain at least three digits...";
	}
}
 
int main() {
	array(int) numbers = ({123, 12345, 1234567, 987654321, 10001, -10001, -123, -100, 100, -12345, 1, 2, -1, -10, 2002, -2002, 0});
 
	foreach(numbers, int nums) {
		write((string)nums + " : " + middlethree(nums) + "\n");
	}
	return 0;
}