# Handling float or double in calculations

I am having some issues with floating-point variables in ksh scripting.

I am doing some calculations - adding values within the loop. I know the total adds up to one number bu I see a different (smaller) number printed to a screen. So I started echoing all the numbers being added and realized that ksh script rounds of floating point. If a number is greater then 1 but less than 2, for example (1.2), it uses 1. If number is 0.9, it uses 0, etc.

here is an example:

my code:

echo \$incr_num
total=\$((total + \$incr_num))

echo "total so far "\$total

output:

1.02
total so far is 1

0.83
total so far is 1

3.03
total so far is 4

0.90
total so far is 4

22.13
total so far is 26

So I get 26, instead of 27.91

I also tried using bc

total=\$(echo "total + \$incr_num" | bc)

but that gives me an error "syntax error on line 1 stdin"

Can someone help me fix this?
LVL 35
Asked:
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Commented:
it is not really float... just shift ledt, do integercalculations and shift back right.... no loss of INTEGER precision.

PSi'm afraid shell does not process float, you need perl or python or anything that knows floats.
0
Commented:
``````total=\$(echo "total + \$incr_num" | bc)
``````

should be
``````total=\$(echo "\$total + \$incr_num" | bc)
``````
0

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Commented:
Where is  \$incr_num coming from?
0
Author Commented:
Thank you! Worked like a charm
0
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Shell Scripting

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