可不可以讲解一下是怎么运行的啊？为什么结果等于7？

Question

Answer 1

k = 7, s ++, s = 1
k = 6, break;
k = 5, s += 2,s = 3
k = 4, s++, s = 4
k = 3, break
k = 2, break
k = 1,s++, s = 5
k = 0, s += 2,s = 7
k = -1，退出循环，输出s,输出7