Outputs the argument using a floating point format that suits dollar values. The full form is

  ~d,n,w,padchar:@$

with the following interpretations

d (2)

number of digits to print after the decimal point (.),

n (1)

number of digits to print before the decimal point (.),

w (0)

minimum width of the field,

padchar (?\s)

character used to produce right-adjusting padding with,

:

the sign of the value is output before any padding,

@

numbers are always output with sign prepended.