List input is a powerful tool for reading both standard and
nonstandard free-format data.
General form, INPUT statement
using list input:
INPUT variable <$>;
variable specifies the variable whose
value the INPUT statement is to read
$ specifies that the variable is
a character variable.
Suppose you have an external
data file like the one shown below. The file, which is referenced
by the fileref Credit, contains the results of a survey on the use
of credit cards by males and females in the 18-39 age range.
need to read the data values for