ruby学习_2

=begin变量：局部变量：以小写字母或者'_'起始的变量全局变量：以‘$’起始的变量实例变量：以'@'起始的变量类变量：  以'@@'起始的变量虚拟变量：”true“,"false","self"等特定名称的变量unless语句：unless condition thenactend与if相反etc.->a = 10  b = 20  unless a > b    puts "execute here!"  end    output:  execute here!case 语句：case 比较的对象when value1 thenact1when value2 then    act2elseact3enduntil 语句：sum = 0i = 1 until sum >= 50sum+=ii += 1 end=endi = 0['gao','shang','bo','for','test'].each{|str|  i += 1  if(i == 3)    break  end  p [i,str]}#another sample=begin  continue ？=endi = 0['gao','shang','bo','for','test'].each{|str|  i += 1  if(i == 3)    next  end  p [i,str]}#the third sample=begin  redo 再次执行当前语句，即执行i += 1=endi = 0['gao','shang','bo','for','test'].each{|str|  i += 1  if(i == 3)    redo  end  p [i,str]}