Question

Problem 14)(Java) The following method contains a single error.
Describe the error and show how to fix it.

private static int findLastDigit(int n)
{
  if (n > 0)
    return n % 10;
  else if (n < 0)
    return -n % 10;
}

Answer 1

Error:
--------
method does not handle the case of when n is zero.
so, the code gives compilation error, because not all code paths are returning a value.

Fix:
------
return 0, if n is zero.

Fixed code:
------------
private static int findLastDigit(int n) {
    if (n > 0)
        return n % 10;
    else if (n < 0)
        return -n % 10;
    return 0;   // Fix here. return 0, if n is zero.
}