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Here's why getchar can be executed. After it becomes scanf, even if the correct value is entered, it still prompts for input error

2022-02-02 22:33:53 【CSDN Q & A】

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Refer to the answer 1：

if（d>=0&&d<=’9"）



Refer to the answer 2：


Refer to the answer 3：

You shouldn't use variables d Do you ,c It's a int, You should be with 0 and 9 Compare , Rather than '0','9' To compare .
Write too much useless code , Confused yourself



Refer to the answer 4：

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