Round to two decimal place

Hi
I have a variable say @price. It is either blank or has a value. If
it is blank I have to show it like $ 0.00 . So I wrote helper like

@price.blank? ? ‘$’+‘0.00’ : '$'[email protected]_s

 But the problem if @price has value 400.00  , after doing

@price.to_s it changes to 400.0 What I want is exactly 400.00 .And if
I remove to_s above it will throw an error
can’t convert BigDecimal into String

Please help

Thanks
Tom

On Tue, Sep 7, 2010 at 4:16 PM, Tom M. [email protected] wrote:

can’t convert BigDecimal into String
try methods to_i, to_f, and %

eg

“$%6.2f” % " ".to_f
=> “$ 0.00”
“$%6.2f” % 400.to_f
=> “$400.00”

best regards -botp

On Tue, Sep 7, 2010 at 3:16 AM, Tom M. [email protected] wrote:

can’t convert BigDecimal into String

Please help
Thanks
Tom

Posted via http://www.ruby-forum.com/.

Based on your use of the word “helper” I assume you’re using Rails (this
is
not a Rails forum), if that is so, try
http://api.rubyonrails.org/classes/ActionView/Helpers/NumberHelper.html#method-i-number_to_currency

Otherwise, check out sprintf

require ‘bigdecimal’
@price = BigDecimal.new “400.00”
sprintf( “$%.02f” , @price ) # => “$400.00”

For more details on how to create a format string, the docs for sprintf
are
pretty good http://ruby-doc.org/ruby-1.9/classes/Kernel.html#M002627

Tom, because you are dealing with prices, you might be interested in this money gem
http://github.com/RubyMoney/money

Examples of  usage in your context
>> Money.us_dollar(0).format
=> "$0.00"
>> Money.us_dollar(40.345).format
=> "$0.40"
>>

#Eugen



On 09/07/2010 12:41 PM, Josh C. wrote:
On Tue, Sep 7, 2010 at 3:16 AM, Tom M. <[email protected]> 
wrote:
  
Hi
  I have a variable  say  @price. It is either blank or has a value. If
it is blank I have to show it like  $ 0.00  . So I wrote helper like

@price.blank? ? ‘$’+‘0.00’ : '$'[email protected]_s

But the problem if @price has value 400.00  , after doing

@price.to_s it changes to 400.0 What I want is exactly 400.00 .And if
I remove to_s above it will throw an error
can’t convert BigDecimal into String

Please help
Thanks
Tom

Posted via http://www.ruby-forum.com/.

</pre>
Based on your use of the word "helper" I assume you're 
using Rails (this is
not a Rails forum), if that is so, try
http://api.rubyonrails.org/classes/ActionView/Helpers/NumberHelper.html#method-i-number_to_currency

Otherwise, check out sprintf

require ‘bigdecimal’
@price = BigDecimal.new “400.00”
sprintf( “$%.02f” , @price ) # => “$400.00”

For more details on how to create a format string, the docs for sprintf
are
pretty good http://ruby-doc.org/ruby-1.9/classes/Kernel.html#M002627

Tom, because you are dealing with prices, you might be interested in
this money gem
http://github.com/RubyMoney/money

Examples of usage in your context

Money.us_dollar(0).format
=> “$0.00”

Money.us_dollar(40.345).format
=> “$0.40”

#Eugen

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