Ruby学習#15 Methods

def sayhi
puts "Hello User"
end

sayhi

Hello User

puts "Top"
sayhi
puts "Bottom"

def sayhi(name,age)
puts ("Hello" + name + ",you are " + age)
end

sayhi("Mike",73)

error String型とInt型がくっつかない。
def sayhi(name,age)
puts ("Hello" + name + ",you are " + age.to_s)
end

sayhi("Mike",73)

Hello Mile ,you are 73

def sayhi(name="no name",age=-1)
puts ("Hello" + name + ",you are " + age.to_s)
end
sayhi("Mike")

Hello Mike, you are -1
sayhi
Hello no name , you are -1