Re: Procedure for percent of a value
- From: Ron Fox <fox@xxxxxxxxxxxx>
- Date: Fri, 29 Feb 2008 12:34:42 -0500
If integer percentages are ok.. another well known dodge for us
old fogies who have done a lot of work on integer only systems is
to multiply first ie.g.
set srate [expr ($tps_ok*100)/$number_of_total_tps]
Ron.
Simon Bachmann wrote:
Marcos Martinez Sancho wrote:.Hello,
I need a small procedure for calculate the percent of a value
e.g.
set srate [expr int(($tps_ok / $number_of_total_tps)*100)]
puts "\nTEST RESULT: $number_of_total_tps tps of which $tps_ok PASSED and $tps_nok FAILED so $srate % succes rate"
doesnt look optimal and is not working except when srate = 100%. Otherwise, I get 0%.
When both numbers in a division operation are are integer, [expr] performs an integer division. That means that only the integer part of the result is calculated, no "comma part":
% expr 10/3
3
%
And since srate < 100% means that tps_ok is less than number_of_total_tps, the $tps_ok / $number_of_total_tps will always give 0 as result.
The solution is to make one of the values a floating point value, all other numbers will be "coerced" into floating point numbers too. Usually it's done like this:
set srate [expr int((1.0 * $tps_ok / $number_of_total_tps)*100)]
^^
Any input is appreciated.
Thanks
Marcos
- References:
- Procedure for percent of a value
- From: Marcos Martinez Sancho
- Re: Procedure for percent of a value
- From: Simon Bachmann
- Procedure for percent of a value
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