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並前往https://stackoverflow.com/questions/554063/how-do-i-print-a-double-value-with-full-precision-using-cout

How do I print a double value with full precision using cout?

You can set the precision directly on std::cout and use the std::fixed format specifier. double d = 3.14159265358979; cout.precision(17); cout << "Pi: ...

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