program to find sine of an angle using c

program to find sine of an angle using c
#include<stdio.h>
#include<math.h>
int main()
{
  float s=0,x,i,n,f,p,j,k=2;
  printf("Enter the value of n:");
  scanf("%f",&n);
  printf("\nEnter the value of x:");
  scanf("%f",&x);
  for(i=1;i<=n;i++)
  {
    p=pow(x,i);
    f=1;
    for(j=1;j<=i;j++)
    {
      f=f*1;
    }
    s=(p/f)*pow(-1,k++);
  }
  printf("%f",s);
  return(0);
}