#define XXX do{ XXX } while(0) 为什么会有这种用法

Words that I likeWhen I’m scared to tackle an obstacle, I close my eyes and pretend im an 80 year old man who regrets not tackling all the obstacles he wanted to in life. Then when I feel like that old man, I say to myself, "I wish I was young again", then I open my eyes….And BOOM! I’m young again. — Hopsin

，每一个成功者都有一个开始。勇于开始，才能找到成功的路。