k&r(7.4): Formated Input---Scanf

/* k&r(7.4): Formated Input-Scanf
   created on Mar 27, 2011
   */

#include    "stdio.h"

main() /* rudimentary calculator */
{
    double sum, v;

    sum = 0;
    while (scanf("%lf", &v) == 1) /* here arguments of scanf must be pointers */
      printf("\t%.2f\n", sum += v);
    return 0;
}