Sine Series

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

int main()
{
    int i, n;
    float x, val, sum, t;

    printf("Enter the value for x (in degrees): ");
    scanf("%f", &x);
    printf("Enter the value for n : ");
    scanf("%d", &n);
    val = x;
    x = x * 3.14159 / 180;
    t = x;
    sum = x;

    for (i = 1; i < n + 1; i++)
    {
        t = (t * pow((double) (-1), (double) (2 * i - 1)) *
             x * x) / (2 * i * (2 * i + 1));
        sum = sum + t;
    }

    printf("Sine value of %f is : %8.4f", val, sum);

    return 0;
}

OUTPUT

Enter the value for x (in degrees): 45
Enter the value for n : 1
Sine value of 45.000000 is :   0.7047