你离这本书第一部分的结尾已经不远了，你应该已经具备了足够的 Ruby 基础知识，可以继续学习一些程序的原理了，但你应该做更多的练习。这个练习的内容比较长，它的目的是锻炼你的毅力，下一个习题也差不多是这样的，好好完成它们，做到完全正确，记得仔细检查。 ~~~ puts "Let's practice everything." puts "You\'d need to know \'bout escapes with \\ that do \n newlines and \t tabs." poem = <<MULTI_LINE_STRING \tThe lovely world with logic so firmly planted cannot discern \n the needs of love nor comprehend passion from intuition and requires an explanation \n\t\twhere there is none. MULTI_LINE_STRING puts "--------------" puts poem puts "--------------" five = 10 - 2 + 3 - 6 puts "This should be five: #{five}" def secret_formula(started) jelly_beans = started * 500 jars = jelly_beans / 1000 crates = jars / 100 return jelly_beans, jars, crates end start_point = 10000 beans, jars, crates = secret_formula(start_point) puts "With a starting point of: #{start_point}" puts "We'd have #{beans} beans, #{jars} jars, and #{crates} crates." start_point = start_point / 10 puts "We can also do that this way:" puts "We'd have %s beans, %s jars, and %s crates." % secret_formula(start_point) ~~~ # 你应该看到的结果 * * * * * ~~~ $ ruby ex24.rb Let's practice everything. You'd need to know 'bout escapes with \ that do newlines and tabs. -------------- The lovely world with logic so firmly planted cannot discern the needs of love nor comprehend passion from intuition and requires an explanation where there is none. -------------- This should be five: 5 With a starting point of: 10000 We'd have 5000000 beans, 5000 jars, and 50 crates. We can also do that this way: We'd have 500000 beans, 500 jars, and 5 crates. $ ~~~ # 加分习题 * * * * * 1. 记得仔细检查结果，从后往前倒着检查，把代码朗读出来，在不清楚的位置加上注释。 2. 故意将代码改烂，执行并检查会发生什么样的错误，并且确认你有能力改正这些错误。