この電卓を動作させるにはどうすればいいですか？

Question

私はちょうど1つの方法で作業し、残りの部分にそれを複製したいと思っていました。これが、実際には1つの方法しか行われない理由です。 （ちょっと）

puts "Welcome to My Calculator! " 

print "Please place in the numbers. " 

first_number = gets.to_i 

print "Second number. " 

second_number = gets.to_i 


puts "What operation? " 

operation_selection = gets 

if(operation_selection == "add") 

    addition_function 

    puts"#{result}" 

end 


def addition_function 
result = first_number + second_number 

end 

def subtraction_function 
    result = first_number - second_number 

end 

def divison_function 
    result = first_number/second_number 

end 

def multiplication_function 
    result = first_number * second_number 

end 

Answer 1

これは何ですか？

puts "Welcome to My Calculator! " 

print "Please place in the numbers. " 

first_number = gets.to_i 

print "Second number. " 

second_number = gets.to_i 


puts "What operation? " 

operation_selection = gets.chomp.downcase.to_s 

def oper(operation_sel, first_number,second_number) 
    case operation_sel 
     when "add" 
      puts first_number + second_number 
     when "sub" 
      puts first_number - second_number 
     when "div" 
      puts first_number/second_number 
     when "mul" 
      puts first_number * second_number 
     end 
end 

oper(operation_selection,first_number,second_number)