Question

Write a program that outputs the string representation of numbers from 1 to n.
But for multiples of three it should output “Fizz” instead of the number and for the multiples of five output “Buzz”. For numbers which are multiples of both three and five output “FizzBuzz”.

Answer

程序中主要使用了

• for i in start .. end循环结构，也可以用 times,while实现
• if then else 选择结构
• % 求余运算
• and 与逻辑运算
• 数组<<运算符 ：数组元素追加，ruby的数组比较灵活，声明时可以不申明大小。
• 方法定义：def function_name(args,...) ... end

# @param {Integer} n
# @return {String[]}
def fizz_buzz(n)
    result = Array.new()
    for i in 1 .. n
        if i % 3 == 0 and i % 5==0 then
          result << "FizzBuzz"
        else 
            if i % 3 == 0 then
              result << "Fizz"
            else 
                if i % 5 == 0 then
                result << "Buzz"
                else
                result << "#{i}"
                end
            end
         end
    end
    return result
end