taylor.cpp

#include <stdio.h>
#include <math.h>
#include <conio.h>

#define PI 3.1415926

double mysin(double n)
{
	if (n >= 0) {
		while (n >= 1) {
			n -= 2 * PI;
		}
	}
	else {
		while (n <= -1) {
			n += 2 * PI;
		}
	}

	double e = 0.001;
	double res = 0;
	
	double el = n;
	
	int i = 1;
	int c = 1;

	while (abs(el) >= e) {
		if (c % 2 != 0) {
			res += el;
		}
		else {
			res -= el;
		}
		
		i += 2;
		++c;
		
		el /= i * (i - 1);
		el *= n * n;
	}

	return res;
}

int main(void) {
	printf("%lf", mysin(100));
	getch();
	return 0;
}