Reading numbers from command-line arguments:
 1.00e-02
-2.00e+04
 3.14e+00
Reading numbers from stdandard input:
-1.10e-03
 2.00e-04
-3.00e-05
Reading numbers from a file and writing to a file:
here is a copy of the output:
-1.10e-03
 2.00e-04
-3.00e-05