object LastNDigitsApp {
/*
Extracts the last N digits from a given number.
Approach:
- To get the last N digits, compute: number % math.pow(10, digits).toInt
- This avoids string manipulation and uses efficient arithmetic.
Parameters:
number : the original integer
digits : how many digits to extract from the end
Returns:
The last N digits as an Int.
*/
def getLastNDigits(number: Int, digits: Int): Int = {
// Compute 10^digits using math.pow (returns Double)
// Convert to Int because modulo requires integer operands
val divisor: Int = math.pow(10, digits).toInt
// Modulo returns the remainder, which is exactly the last N digits
number % divisor
}
def main(args: Array[String]): Unit = {
// Example values
val number: Int = 987654321
val digits: Int = 4
// Extract the last N digits
val result: Int = getLastNDigits(number, digits)
// Display the result
println(s"Original number: $number")
println(s"Digits requested: $digits")
println(s"Last $digits digits: $result")
}
}
/*
run:
Original number: 987654321
Digits requested: 4
Last 4 digits: 4321
*/
