实数的幂 [英] Exponentiation of real numbers

问题描述

我遇到了一个有趣的运动，它说：实现一个函数x ^Ÿ使用Turbo Pascal的标准功能

I've come across an interesting exercise and it says: Implement a function x^y using standard functions of Turbo Pascal

有关整数变量，我可以使用为循环，但我不明白如何与真正在这种情况下变量。

For integer variables I can use for loop but I cannot understand how to work with real variables in this case.

我一直在思考如何做到这一点使用的泰勒级数（不知道如何使用它幂），我还发现， X ^ÿ = EXP（Y *日志（X））但是只有 LN （自然对数）的标准功能......

I've been thinking about how to do this using Taylor series (can't understand how to use it for exponentiation) and I also found out that x^y = exp(y*log(x)) but there is only ln (natural logarithm) in standard functions...

PS  我不要求你写code：给我建议或链接或东西，这将有助于解决这一问题，请

PS I'm not asking you to write code: give me advise or link or something that will help to solve this problem, please.

推荐答案

日志（X）的公式是自然对数，因此可以使用

log(x) in your formula is natural logarithm, so you can use

x^y = exp(y*ln(x))

没有任何疑问。无论 EXP 和 LN 是标准的Turbo Pascal功能

without any doubts. Both exp and ln are standard Turbo Pascal functions

（通式为x的X ^计算y = b ^（Y *基-B数）

(general formula is x^y = b^(y * base-b logarithm of x)

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