/*   This program sums the first n terms of the infinite series
     whose ith term is 1/i^2.
*/

#include <stdio.h>

main()
{
   int i, n, resp;
   float sum;

   do {
      printf( "\nAgain (1 = yes, 0 = no)? " );
      scanf( "%d", &resp );
      if ( resp ) {
         printf( "n = ? " );
         scanf( "%d", &n );
         for ( i = n, sum = 0.0; i > 0; i-- )
            sum += 1 / ( ( float ) i * ( float ) i );
         printf( "Sum = %f\n", sum );
      }
   } while ( resp );
}