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addition of both positive and negative numbers

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Top Forums Shell Programming and Scripting addition of both positive and negative numbers
# 8  
Old 11-10-2010
Most likely all other operations could be made easier with awk as well, but if you insist....
Code:
#!/bin/ksh
#set -x

sum=0
while read num
do
  num=$(echo $num|sed 's/+//g')
  sum=$(echo "$sum + $num" |bc)
done < myFile
echo $sum

# 9  
Old 11-10-2010
In ksh93 it is easy without external programs:
Code:
sum=0
while read val
do
  (( sum+=val ))
done < infile
echo $sum

Or in any Posix compliant shell:
Code:
str=0
while read val
do
  str="$str $val"
done < infile
echo $str | bc

It can also be done like this, without a loop:
Code:
v=$(cat infile); echo ${v#?} | bc

Last edited by Scrutinizer; 11-10-2010 at 11:06 AM.. Reason: Should be ksh93, and posix compliant shell
# 10  
Old 11-10-2010
Quote:
Originally Posted by Scrutinizer
In ksh it is easy without external programs:
not all ksh-s provide floating point arithmetics
Quote:
Originally Posted by Scrutinizer
Code:
sum=0
while read val
do
  (( sum+=val ))
done < infile
echo $sum

Or in any shell:
This doesn't work with Solaris' Bourne shell (/bin/sh)
Quote:
Originally Posted by Scrutinizer
Code:
str=0
while read val
do
  str="$str $val"
done < infile
echo $str | bc

It can also be done like this, without a loop:
Code:
v=$(cat infile); echo ${v#?} | bc

# 11  
Old 11-10-2010
Quote:
Originally Posted by vgersh99
not all ksh-s provide floating point arithmetics
Correct, that should be ksh93.
Quote:
This doesn't work with Solaris' Bourne shell (/bin/sh)
It works with any Posix shell (so /usr/xpg4/bin/sh on Solaris).
But this should just work in Bourne shell as well, shouldn't it? Did you try?
-----
edit: Ah, I see you did not mean the loop but the second part: because of the $() .
Then you can use:
Code:
v=`cat infile`; echo ${v#?} | bc

Last edited by Scrutinizer; 11-10-2010 at 11:02 AM..
# 12  
Old 11-10-2010
Code:
paste -sd+ myFile | sed 's/+\([+-]\)/\1/g;s/^+//'|bc

---------- Post updated at 10:01 AM ---------- Previous update was at 10:00 AM ----------

Quote:
Originally Posted by Scrutinizer
Correct, that should be ksh93.

It works with any Posix shell (so /usr/xpg4/bin/sh on Solaris).
But this should just work in Bourne shell as well, shouldn't it? Did you try?
I did try it with Solaris' Bourne (/bin/sh) - 'str' doesn't hold the value outside the loop.
# 13  
Old 11-10-2010
Quote:
Originally Posted by vgersh99
This doesn't work with Solaris' Bourne shell (/bin/sh)
So what? That's an ancient, dessicated stub.
# 14  
Old 11-10-2010
Quote:
Originally Posted by Corona688
So what? That's an ancient, dessicated stub.
Just sayin'....
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