Ruby program to print power of a number

=begin
Ruby program to calculate power of a number.    
=end

def pow(a,b)
    power=1
    for i in 1..b
        power=power*a
    end
    return power
end

puts "Enter Base:-"
base=gets.chomp.to_i

puts "Enter exponent:-"
expo=gets.chomp.to_i

puts "The power is #{pow(base,expo)}"

Output

RUN 1:
Enter Base:-
3
Enter exponent:-
5
The power is 243

RUN 2:
Enter Base:-
2
Enter exponent:-
3
The power is 8