error問題
'isnan' was not declared in this scope
isnan在cmath中被取消宏定義；
// These are possible macros imported from C99-land. #undef fpclassify #undef isfinite #undef isinf #undef isnan
使用的時候可以在isnan前加上std命名空間即可；
【error】'isnan' was not declared in this scope
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