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Why does it output null when I follow the teacher's code?
顾与相识
2018-07-17 22:25:14
0
1
1371
Why do I output null
when I follow the teacher’s code?
1
0
0
顾与相识
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无忌哥哥
2018-07-18 09:19:25
1 floor
Returning null may mean there are no parameters.
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Thank you. I checked carefully and found that I made a mistake. I understand now. Thank you so much
顾与相识
author 2018-07-18 09:30:08
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Returning null may mean there are no parameters.