Ruby program to calculate the sum of all even numbers

=begin
Ruby program to calculate the sum of 
all even numbers upto n
=end

sum=0

puts "Enter n:-"
n=gets.chomp.to_i

i=1
while(i<=n)
    if(i%2==0)     #using % operator
        sum=sum+i
        i=i+1
    else
        i=i+1
    end
end

puts "The sum is #{sum}"

Output:

RUN 1:
Enter n:-
5
The sum is 6

RUN 2:
Enter n:-
60
The sum is 930