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

int factorial(int n)
{
  if (n == 0)
  {
    return 1;
  }
  else
  {
    return n*factorial(n-1);
  }
}

int main(void)
{
  /* variables declaration */
  long double x=0;
  long double sinval = 0,cosval = 0;
  int n,i,sinsign,cossign;

  char print_st[20];
  char c1 = 1;

  /* Get input x in radians */
  printf("Enter cos/sin: ");
  scanf("%s",print_st);

  switch(print_st[0])
  {
    case 'c':
     printf("String = cos\n");
     break;
    case 's':
     printf("String = sin\n");
     break;
    default:
     printf("String invalid\n");
     break;
  }

  printf("%s of which x :",print_st);
  scanf("%Lf",&x);

  n=0; i=0;
  sinsign=1;
  cossign=1;

  while(n<10)
  {
   if (n%2 == 1)
   {
     sinval = sinval + sinsign*pow(x,n)/factorial(n);
     sinsign=sinsign*(-1);
   }
   else
   {
     cosval = cosval + cossign*pow(x,n)/factorial(n);
     cossign=cossign*(-1);
   }
   n++;
  }

  /* Print sin,cos values */
  switch(print_st[0])
  {
      case 'c':
       printf("Approximately, Cos(%.2Lf) = %Lf\n",x,cosval);
       break;
      case 's':
       printf("Approximately, Sin(%.2Lf) = %Lf\n",x,sinval);
       break;
      default:
       printf("Approximately, Sin(%.2Lf) = %Lf, Cos(%.2Lf) = %Lf\n",x,sinval,x,cosval);
       break;
  }


  return 0;
}