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【错误】 y1重定义,以前的定义是“函数”

时间:2020-04-19 20:07:45      阅读:188      评论:0      收藏:0      [点我收藏+]

前几天定义y1出现这样的报错,没管改成y11就继续写,今天比赛又忘记这个,赶紧上网查查是什么原因,这个y1在math.h里定义过了。继续打开math.h - corecrt_math.h 

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 发现,不仅是y1,连j0,j1,jn,y0,yn都被定义了

作用:

Function: double j0 (double x)
j0 returns the Bessel function of the first kind of order 0 of x. It may signal underflow if x is too large.

Function: double j1 (double x)
j1 returns the Bessel function of the first kind of order 1 of x. It may signal underflow if x is too large.

Function: double jn (int n, double x)
jn returns the Bessel function of the first kind of order n of x. It may signal underflow if x is too large.

Function: double y0 (double x)
y0 returns the Bessel function of the second kind of order 0 of x. It may signal underflow if x is too large. If x is negative, y0 signals a domain error; if it is zero, y0 signals overflow and returns -∞.

Function: double y1 (double x)y1 returns the Bessel function of the second kind of order 1 of x. It may signal underflow if x is too large. If x is negative, y1 signals a domain error; if it is zero, y1 signals overflow and returns -∞.

Function: double yn (int n, double x)yn returns the Bessel function of the second kind of order n of x. It may signal underflow if x is too large. If x is negative, yn signals a domain error; if it is zero, yn signals overflow and returns -∞.

大概意思就是返回一个贝塞尔函数什么什么的

参考:

Standard library header < math >
These are some more exotic mathematical functions .

参考链接:https://blog.csdn.net/lsyiii1112/article/details/102966950

感觉这是历史遗留问题。。。。下次手动写y11

【错误】 y1重定义,以前的定义是“函数”

原文:https://www.cnblogs.com/xxxsans/p/12732913.html

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