Task

The objective is to write a function that finds the sum of all positive multiples of 3 or 5 below n.

Show output for n = 1000.

This is is the same as Project Euler problem 1.

Extra credit: do this efficiently for n = 1e20 or higher.




 
 
 
var n:Int=1000
 
func sum(x:Int)->Int{
 
	var s:Int=0
	for i in 0...x{
		if i%3==0 || i%5==0
		{
			s=s+i
		}
 
	}
	return s
}
 
var sumofmult:Int=sum(x:n)
print(sumofmult)
 
 