Thank you. I will take a look at it. On Jan 11, 3:04 pm, Colin Law <[email protected]> wrote: > On 11 January 2012 11:07, Ahmy Yulrizka <[email protected]> wrote: > > > > > > > > > > > > > Ahmy Yulrizka > > > On Wed, Jan 11, 2012 at 1:43 AM, Loren <[email protected]> wrote: > > >> ... > >> puts var_m * numb_m + var_d * numb_d + var_c * numb_c + var_l * > >> numb_l + var_x * numb_x + var_v * numb_v + var_i * numb_i > > > this line interpret as var_i * nil > > hence that error > > > simple solution is > > > change it to : > > > var_i * (numb_i || 0) > > > that line actually mean : > > > var_i * numb_i if numb_i is not nil > > else var_i * 0 > > Also have a look at the Rails Guide on debugging, that will show you > how to use ruby-debug to break into your code and inspect data, which > will help when you have similar issues again. > > Colin
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