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20200826冯强_日志

学习总结:

if-else

​ if-else是相对的 若执行了if不会执行else

switch

​ 把条件传进switch 需要添加break 不然全部都会执行 可以添加其他情况default

for while do-while

for和while情况类似 do-while会先执行一次

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