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up vote 5 down vote favorite

I am trying to create a way to convert some values of numbers into currency (dollars). The example I display below takes in three random numbers between -4 and 4, and rounds them to the second decimal place. How could I create the output in $$ though? Should I try something rule based?

Clear[sequence];
sequence = RandomReal[{-4, 4}, 3];
Map[(N[Round[10^2 *#]/(10^2)]) &, sequence]

{-3.73, 2.03, 0.31}

But I want -$3.73 and so on...

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up vote 3 down vote 
cash = N[Round[10^2*#]/(10^2)] & /@ RandomReal[{-4, 4}, 3]

{-3.21, 2.64, -2.6}

If[Sign[#] > 0, "$" <> ToString[#], 
   "-$" <> ToString[Abs[#]]] & /@ cash

{"-\$3.21", "\$2.64", "-\$2.6"}

Note the output is a list of strings.

Or

q = Quantity[cash, "USDollars"]

{\$-3.21, \$2.64, \$-2.6}

The output is a list of Quantities:

QuantityQ /@ q

{True, True, True}

share|improve this answer
up vote 3 down vote

Quantity and Units are your friends. One way could be:

Clear[sequence];
sequence = RandomReal[{-4, 4}, 3];
d = Map[(N[Round[10^2*#]/(10^2)]) &, sequence]

{3.82,3.64,0.}

Quantity[d, "USD"]

{$ 3.82,$ 3.64,$ 0.}

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up vote -1 down vote 
Map[$, N[Round[10^2*#]/(10^2)] & /@ RandomReal[{-4, 4}, 3]]
    (*{$[3.61], $[2.45], $[-1.79]}*)

Is that what you want?

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