```I am attempting to make a Vector Calculator, that will take either
coordinates, or an already given vector. The if and elsif blocks work
fine, it is the else block that I am in need of help in. I want the code
to re-run from the "answer = gets.chomp.to_i" line if the answer does
not equate to "given" or "coordinates", but when i run the code I am
given the following errors:

vector_calc.rb:48: warning: string literal in condition
vector_calc.rb:51: warning: string literal in condition
vector_calc.rb:50: Invalid retry
vector_calc.rb: compile error (SyntaxError)

The code is below.

puts "Are the vectors given, or do you only know coordinates?"
puts "Please answer either 'given' or 'coordinates'."

begin

if answer == "coordinates"
puts "What is the x-value of your first coordinate?"
x1 = gets.chomp.to_i

puts "What is the y-value of your first coordinate?"
y1 = gets.chomp.to_i

puts "What is the x-value of your second coordinate?"
x2 = gets.chomp.to_i

puts "What is the y-value of your second coordinate?"
y2 = gets.chomp.to_i

coord_1 = [x1, y1]
coord_2 = [x2, y2]

puts "Point A = (#{x1}, #{y1})"
puts "Point B = (#{x2}, #{y2})"

elsif answer == "given"
puts "What is vector A's x-value?"
vect_Ax = gets.chomp.to_i

puts "what is vector A's y-value?"
vect_Ay = gets.chomp.to_i

vect_A = [vect_Ax, vect_Ay]

puts "What is vector B's x-value?"
vect_Bx = gets.chomp.to_i

puts "what is vector B's y-value?"
vect_By = gets.chomp.to_i

vect_B = [vect_Bx, vect_By]

puts "Vector A = [#{vect_Ax}, #{vect_Ay}]"
puts "Vector B = [#{vect_Bx}, #{vect_By}]"
else
if answer != "given" || "coordinates"
then puts "Please answer either 'given' or 'coordinates'."
end
until answer == "coordinates" || "given"
retry
end
end
end

P.S I am creating this code as part of an outcome to a research project,