Script started on Fri Aug 30 14:33:27 2002
Displaying on dakarnomad.hss.cmu.edu:0.0
[famine]~/F711% dir

 
Directory of brian/F711/
 
total 120
drwxr-xr-x    2 brian    users        4096 Aug 30 13:23 .
drwxr-xr-x   70 brian    root         8192 Aug 30 14:17 ..
-rw-r--r--    1 brian    users        1645 Aug 27 23:37 add.c
-rw-r--r--    1 brian    users           0 Aug 30 14:33 bozo.txt
-rw-r--r--    1 brian    users         591 Aug 27 12:30 car-gals.dat
-rw-r--r--    1 brian    users         709 Aug 27 12:30 car-miles.dat
-rw-r--r--    1 brian    users         709 Aug 27 12:30 car-time.dat
-rw-r--r--    1 brian    users         173 Aug 26 13:13 cmds.txt
-rw-r--r--    1 brian    users        2376 Aug 27 12:30 copenhagenhousing.dat
-rwxr-----    1 brian    users       13138 Aug 30 13:23 depression.dat
-rw-r--r--    1 brian    users        4042 Aug 27 12:30 education.dat
-rw-r--r--    1 brian    users         143 Aug 27 12:30 example1
-rw-r--r--    1 brian    users         163 Aug 27 12:30 example2
-rw-r--r--    1 brian    users         189 Aug 27 12:30 example3
-rw-r--r--    1 brian    users         124 Aug 27 12:30 example4
-rw-r--r--    1 brian    users         287 Aug 27 12:30 example5
-rw-r--r--    1 brian    users         124 Aug 27 12:30 example6
-rw-r--r--    1 brian    users         359 Aug 27 12:30 football.dat
-rw-r--r--    1 brian    users        3094 Aug 27 12:30 geyser.dat
-rw-r--r--    1 brian    users        1081 Aug 28 01:06 makefile
-rw-r--r--    1 brian    users          52 Aug 27 12:30 neurological.dat
-rw-r--r--    1 brian    users         141 Aug 28 02:51 probierung
-rw-r--r--    1 brian    users          65 Aug 27 12:30 README
-rw-r--r--    1 brian    users        1223 Aug 28 01:16 roster-header.txt
-rw-r--r--    1 brian    users        1154 Aug 26 13:19 roster.txt
-rw-r--r--    1 brian    users         441 Aug 27 12:30 singers.dat
-rwxr-xr-x    1 brian    users         281 Aug 28 03:34 update
[famine]~/F711% tpe ype add.c

/* Filename: add.c
   Purpose:  add positive numbers from standard input and send results to standard output.
             End each sum with 0; end program with a negative number or non-number.
             Alternate version: Runstring argument is number of numbers to add;
             may contain zero and negative numbers; only does a single sum.
             You can use, e.g. setenv adddigits 2 to change the number of decimal
             places in the result.
   Compile:  gcc -oadd add.c
   Run:      "add" or "add < mynums.txt" or "add > rslt" or "add < mynums.txt > rslt" 
   Example:  echo 1 2 3 4 5 6 0 7 8 end | add | sort | add 2
*/

#include <stdlib.h>

int main(int argc, char **argv) {
  double sum=0;
  double input;
  int count=0, CountTo=0;
  int numdecimals=4;
  char *decistring;

  decistring=getenv("adddigits");
  if (decistring!=NULL)
     numdecimals=atoi(decistring);

  if (argc>1)
    CountTo=atoi(argv[1]);

  while (1) {
    /* read number from standard input; exit loop if non-numeric */
    if (scanf("%lf", &input)!=1)
      break;
    count++;

    /* quit loop if input is negative */
    if (CountTo==0 && input<0) break;

    /* complete current sum if input is zero */
    if (CountTo==0 && input==0) {
      printf("%10.*f\n", numdecimals, sum);
      sum=0;
      continue;
    }

    /* compute running sum if input is positive*/
    sum+=input;
  
    /* See if done for argument count version */
    if (CountTo>0 && count==CountTo)
      break;
  }

  /* If loop exited without a final zero, print last sum */
  if (CountTo>0 || sum>0) printf("%10.*f\n", numdecimals, sum);
  exit(EXIT_SUCCESS);
}

[famine]~/F711%  gcc -oadd add.c

[famine]~/F711% dir ls -al add*

-rwxr-xr-x    1 brian    users       14393 Aug 30 14:35 add
-rw-r--r--    1 brian    users        1645 Aug 27 23:37 add.c
[famine]~/F711% add

1 2 3 0
    6.0000
20 30 50 0
  100.0000
1 2 3 0 20 30 50 0 
    6.0000
  100.0000
-3
[famine]~/F711% ./addexit
Script done on Fri Aug 30 14:37:07 2002