sin x in Visual C++

Question

See https://learn.microsoft.com/en-us/cpp/c-runtime-library/reference/sin-sinf-sinl?view=msvc-170 .
There wrote what do You doing with him . i am interesing Where do Microsoft get sine x in Visual C++?

Answer 1

Hi, @Batorek

sin( ) is a function: _Check_return_ double __cdecl sin(_In_ double _X);
You could also try to write sin().
For example:

#include<iostream>  
#include<math.h>  
  
double MySin(double x)  
{  
	double s, t;  
	int n;  
  
	t = x; n = 1; s = x;  
	do {  
		n = n + 2;  
		t = -t * x * x / (n - 1) / n;  
		s = s + t;  
	} while (fabs(t) >= 1e-7);  
	return s;  
}  
int main()  
{  
	//  30°==0.52359877559829887307710723054658  
	std::cout << MySin(0.52359877559829887307710723054658)<<std::endl;  
	std::cout << sin(0.52359877559829887307710723054658)<<std::endl;  
    //out put :0.5  
}  

Best regards,

Minxin Yu

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