if((fp=fopen_s("E:\student.txt","wb"))==NULL),这个代码老是提示错误
运行后系统提示是这个原因,求解释!warningC4129:'s':unrecognizedcharacterescapesequence...
运行后系统提示是这个原因,求解释!
warning C4129: 's' : unrecognized character escape sequence 展开
warning C4129: 's' : unrecognized character escape sequence 展开
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