#include <ctype.h>
   #include <stdio.h>
   #define MAXLINE 100



  /* getline:  get line into s, return length */
   int getline(char s[], int lim)
   {
       int c, i;

       i = 0;
       while (--lim > 0 && (c=getchar()) != EOF && c != '\n')
           s[i++] = c;
       if (c == '\n')
           s[i++] = c;
       s[i] = '\0';
       return i;
   }   

   /* atof:  convert string s to double */
   double atof(char s[])
   {
       double val, power;
       int i, sign;

       for (i = 0; isspace(s[i]); i++)  /* skip white space */
           ;
       sign = (s[i] == '-') ? -1 : 1;
       if (s[i] == '+' || s[i] == '-')
           i++;
       for (val = 0.0; isdigit(s[i]); i++)
           val = 10.0 * val + (s[i] - '0');
       if (s[i] == '.')
           i++;
       for (power = 1.0; isdigit(s[i]); i++) {
           val = 10.0 * val + (s[i] - '0');
           power *= 10;
       }
       return sign * val / power;
   }


   main()
   {
       double sum, atof(char []);
       char line[MAXLINE];
       int getline(char line[], int max);

       sum = 0;
       while (getline(line, MAXLINE) > 0)
           printf("\t%g\n", sum += atof(line));
       return 0;
   }