Scala Programming: Calculate the sum of the last 3 elements of an array of integers
Scala Programming Array Exercise-10 with Solution
Write a Scala program to calculate the sum of the last 3 elements of an array of integers. If the array length is less than 3 then return the sum of the array. Return 0 if the array is empty.
Sample Solution:
Scala Code:
object Scala_Array {
def sum_last_3(arr: Array[Int]): Int = {
if (arr.length < 1) 0
else if (arr.length > 0 && arr.length < 3) arr.takeRight(2).sum
else arr.takeRight(3).sum
}
def main(args: Array[String]): Unit = {
val nums1 = Array(1, 2, 3, 4, 5, 7, 9, 11, 14, 12, 16)
println("Original Array elements:")
// Print all the array elements
for ( x <- nums1 ) {
print(s"${x}, ")
}
println("\nSum of the last 3 elements of the said array: "+sum_last_3(nums1))
val nums2 = Array(12, 16)
println("Original Array elements:")
// Print all the array elements
for ( x <- nums2 ) {
print(s"${x}, ")
}
println("\nSum of the last 2 elements of the said array: "+sum_last_3(nums2))
var nums4 : Array[Int] = Array()
println("\nSum of the blank array: "+sum_last_3(nums4))
}
}
Sample Output:
Original Array elements: 1, 2, 3, 4, 5, 7, 9, 11, 14, 12, 16, Sum of the last 3 elements of the said array: 42 Original Array elements: 12, 16, Sum of the last 2 elements of the said array: 28 Sum of the blank array: 0
Scala Code Editor :
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Next: Write a Scala program to create a new array taking the middle element from three arrays of length 5.
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