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Ruby Ruby Operators and Control Structures Logical Operators Practice time! Operators and Control Structures

Posted by Sara Crwly
Sara Crwly
2,453 Points

Why do you have to state the inputs after the method?

In this:

def get_name() print "Enter your name: " return gets.chomp end

def greet(name) print "Hi #{name}!" if (name == "Jason") puts "That's a great name!" end end

def get_number(number) print "What number would you like to test to see if it is divisible by 3? " return gets.chomp.to_i end

def divisible_by_3?(number) return (number % 3 == 0) end

name = get_name() greet(name) number = get_number()

if divisible_by_3?(number) puts "Your number is divisible by 3!" end

Why do you have to put?-

name = get_name() greet(name) number = get_number()

And why there and not at the end?

Thanks, S

1 Answer

Seth Reece
Seth Reece
32,867 Points
Seth Reece
Seth Reece
32,867 Points

Hi Sara,

The main reason for using methods, then calling them later is so they can be called over and over again. Then the method can be changed, and it's changed everywhere it is being used. get_number() is called where it is because it is assigning the return value to the variable number, then checking if that variable is divisible by three. A good example here would be if you also wanted to see if the number was divisible by 2. e.g.

def get_name()
    print "Enter your name: " 
    return gets.chomp 
end

def greet(name)
    print "Hi #{name}!"
    if (name == "Jason")
        puts "That's a great name!"
    end
end

def get_number()
    puts "What number would you like to test to see if it is divisible by 2 and or 3? " # modified to check 2 and 3
    return gets.chomp.to_i
end

def divisible_by_3?(number)
    return (number % 3 == 0)
end

# new method to check if divisible by 2
def divisible_by_2?(number)
    return (number % 2 == 0)
end

name = get_name()
greet(name)
number = get_number()

if divisible_by_3?(number)
    puts "Your number is divisible by 3!"
else
    # modified to give output regardless
    puts "Your number is not divisible by 3!"
end

# new if statement to check for divisible by 2 using same number gotten from calling get_number()
if divisible_by_2?(number)
    puts "Your number is divisible by 2!"
else
    puts "your number is not divisible by 2!"
end
Sara Crwly
Sara Crwly
2,453 Points

Thank you and the above clear and concise. I hadn't until now realised:

name = get_name() greet(name) number = get_number()

were used to call the methods over and over.