Zzuli:1053 sine function

Title Description

Input x, Calculate the front of the above formula 10 Xiang He .

Input

Enter a real number x.

Output

Output a real number , That is, the front of the sequence 10 Xiang He , The result is reserved 3 Decimal place .

The sample input  Copy

1

Sample output  Copy

0.841

#include <stdio.h>
int main()
{
	int i;
	double x;
	scanf("%lf",&x);
	double sum=0,den=1,mol=x,sign=1;
	for(i=1;i<=10;i++)
	{
		sum+=sign*mol/den;
		sign=(-1)*sign;
		den=den*(2*i)*(2*i+1);
		mol=mol*x*x;
	}
	printf("%.3lf",sum);
	return 0;
}