Write a C function to evaluate the series sin(x) = x - (x^3 / 3!) + (x^5 / 5!) - (x^7 / 7!) + . . .

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

int fact(int);
float sine(float value_at);
int main()
{
	float x, sum;
	printf("Enter the angle in radians : ");
	scanf("%lf", &x);
	sum = sine(x); //calling the sum of he series
	printf("\n\nsin(%lf) = %lf", x, sum);
	_getch();
	return 0;
}

float sine(float x)
{
	int i, j, sign = 1;
	float sum = 0;
	for (i = 0, j = 1; i < 5; i++, j += 2, sign *= -1)
		sum = sum + /*pow(-1, i)*/sign*pow(x, j) / fact(j);
	return sum;
}

int fact(int num)
{
	int ans = 1;
	while (num > 0)
	{
		ans *= num;
		num--;
	}
	return ans;
}