C Program to find the sum of the cos series

C Program to find the sum of the cos series , COS series in C, C Language Cos Series calculation.

#include
#include
void main()
{
      float pow = 2.0, nr, dr = 1.0, x1, sum;
      int i = 1,n,s = -1,x;
      clrscr();
      printf("\n\n\t ENTER THE ANGLE...: ");
      scanf("%d", &x);
      x1 = 3.142 * (x / 180.0);
      sum = 1.0;
      nr = x1*x1;
      printf("\n\t ENTER THE NUMBER OF TERMS...: ");
      scanf("%d",&n);
      while(i<=n)
      {
            dr = dr * pow * (pow - 1.0);
            sum = sum + (nr / (dr * s));
            s = s * (-1);
            pow = pow + 2.0;
            nr = nr * x1 * x1;
            i++;
      }
      printf("\n\t THE SUM OF THE COS SERIES IS..: %0.3f", sum);
      getch();
}