Ex1. 代入および出力

Ex1_1:hello worldを返せ.

[bobsNewMacBook:~/Desktop/Ruby/ThreeDays] bob% ruby ex0.rb
Hello world!
[bobsNewMacBook:~/Desktop/Ruby/ThreeDays] bob% cat ex0.rb
puts "Hello world!"

Ex1_2:変数への代入とreturn

1+1をaに代入して,その値を返す関数を作れ.

[bobsNewMacBook:~/Desktop/Ruby/ThreeDays] bob% ruby ex2.rb
2
[bobsNewMacBook:~/Desktop/Ruby/ThreeDays] bob% cat ex1.rb
a=1+1
return a

Ex1_3:printf

printfで"ans=2\n"と返す関数を作れ.

expected = "ans=2\n"