Michael vanaken

Last seen: 3 years 前 | 自 2017 起处于活动状态

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I need to have an error message for when the user inputs a letter into the a,b,c, or d inputs but im not sure how to do it, ive tried using isnan but could not figure out how to implement it into my code for it to work.
I need to have an error message for when the user inputs a letter into the a,b,c, or d inputs but im not sure how to do it, ive ...

7 years 前 | 1 个回答 | 0

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