/* program series */
/* the # sign must appear in column 1 for many C preprocessors */
#include <stdio.h>    /* library of input/output functions */
#include <math.h>     /* library of math functions */

void main()           /* void optional for main */
/*    add the first 100 terms of a simple series */
  {
      double sum;
      int n;
      sum = 0.0;   
      for (n = 1; n <= 100; n++)
        {
         sum =  sum + 1.0/pow((double) n,2.0);
/*       real C programmers would write
         sum + = 1.0/pow((double) n,2.0);   */
         printf("%d %f\n",n,sum);
        }
   }