ruby的六种循环

ruby提供了6种循环语法ttimes/for/while/until/each/loop，如下

都以计算1+2+3+..+10之和为例

第一种：times do

sum=0
11.times do |i|
  p "#{sum}+#{i}"
  sum+=i

end
puts "times循环中sum=#{sum}"

p "======================="

第二种:for in

sum=0
for i in 1..10
  p "#{sum}+#{i}"
  sum+=i

end
puts "for循环中sum=#{sum}"

p "======================="


sum=0
times=[1,2,3,4,5,6,7,8,9,10]
for i in times
  p "#{sum}+#{i}"
  sum+=i

end
puts "for循环中使用数组sum=#{sum}"

p "======================="

第三种:while

sum=0
i=1
while i<=10
  p "#{sum}+#{i}"
  sum+=i
  i+=1
end
puts "while循环中sum=#{sum}"

p "======================="

第四种:until

sum=0
i=1
until i>10
  p "#{sum}+#{i}"
  sum+=i
  i+=1
end
puts "until循环中sum=#{sum}"

p "======================="

第五种:each do

sum=0
i=1
times=[1,2,3,4,5,6,7,8,9,10]
times.each do |i|
  p "#{sum}+#{i}"
  sum+=i
  i+=1
end
puts "each do循环中sum=#{sum}"

p "======================="

第六种:loop do

sum=0
i=1
times=[1,2,3,4,5,6,7,8,9,10]
loop do
  p "loop方法没有终止#{i}"
  p "#{sum}+#{i}"
  sum+=i
  i+=1
  if(i>10)
    break
  end
end
puts "loop循环中sum=#{sum},需要用break进行退出循环，否则会一直循环，如果进入死循环可以使用ctrl+C进行退出"

p "======================="