Iteration 1

difference_of_squares.go

@@ -0,0 +1,31 @@
+// Package diffsquares provides a utility for the determination of the
+// difference between the square of sums and sum of squares on a given
+// number range.
+package diffsquares
+
+// SquareOfSums returns the square of the sum of the range of natural
+// numbers from 1 to the given value.
+func SquareOfSums(n int) int {
+	var s int
+	for i := 1; i <= n; i++ {
+		s += i
+	}
+	return s * s
+}
+
+// SumOfSquares returns the sum of the squares of the range of natural
+// numbers from 1 to the given value.
+func SumOfSquares(n int) int {
+	var s int
+	for i := 1; i <= n; i++ {
+		s += i * i
+	}
+	return s
+
+}
+
+// Difference returns the difference between the sum of squares and the
+// square of sums for the range of natural number up to the given value.
+func Difference(n int) int {
+	return SquareOfSums(n) - SumOfSquares(n)
+}