how to calculate the sum of 1+2+3+.....+n using ruby?

Answer 1

puts (1..gets.to_i).inject(:+)

Answer 2

is Rudy easy

Answer 3

I think this will do it:

#program to add numbers
puts 'Enter a numbr'
x = gets.chomp.to_i
y = 1
z = 0
while y <= x do
z += y
y += 1
end

puts "This is the result #{z}"

Answer 4

# In python

sum = 0
for i in range(1, n+1):
sum += i
print(sum)