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Shell Programming and Scripting

Percentage Calculation in Decimal

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# 8  
Old 11-30-2012
printf sees the output of bc.So, bump up the scale for bc a bit:
Code:
printf "%.2f\n" $(echo -e "scale=10\n(($b-$a)*100)/$b"|bc)

# 9  
Old 11-30-2012
sorry my bad. I should have checked the actual problem ..

here is the real problem

printf "%.2f\n" 12.355 --> output 12.35

But I need it as 12.36
# 10  
Old 11-30-2012
Seem to be a bug that may not be so simple to solve.

Code:
12.355000 -> 12.35 correct 12.36
12.355001 -> 12.36 correct 12.36

# 11  
Old 11-30-2012
Quote:
Originally Posted by Anupam_Halder
printf "%.2f\n" 12.355 --> output 12.35

But I need it as 12.36

Code:
printf "%.2f\n" $(echo -e "scale=10\n(($b-$a)*100)/$b"+0.01|bc)

It will solve your problem. Smilie
# 12  
Old 11-30-2012
will it? What if I have like 12.991 ?
Then it will make it 13 right? Should I add some more small value? Smilie
Like 0.0001 Smilie
# 13  
Old 11-30-2012
Quote:
Originally Posted by Anupam_Halder
will it? What if I have like 12.991 ?
Then it will make it 13 right? Should I add some more small value? Smilie
Like 0.0001 Smilie
good catch...Smilie

my bad Smilie

if you think about small value then still it will be same case if you find there also 12.9999 for 0.0001. Smilie

It better if you check the digit after .
if it is 55 then change it to 56.

I know this is also not good way of doing it..

try
Code:
printf "%.2f\n" $(echo -e "scale=10\n(($b-$a)*100)/$b"|bc | sed 's/\.55/\.56/')

This User Gave Thanks to pamu For This Post:
Anupam_Halder
# 14  
Old 11-30-2012
one more problem ..

what if the value is 12.55? It will make it 12.56 right?
And also we may need to take care many more things Smilie

Like it's not only that I will get 12.55

I may get 1.155 --> And it should give me 1.16
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