慕姐5515600
2021-09-06 16:54
为什么加上一个flag*=-1就改变了正负号,flag*=-1运算的意义什么
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flag*=-1就是flag=flag=flag*(-1),因为此前赋值flag为1,故,flag在以下循环中以1,-1循环,起调节函数作用
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