1. 30% The program can pass compilation process -  no syntax or linking errors

2. 40% The correctness of the program - no logical errors
   ------------------------
      Length     Period 
       (m)        (sec) 
   ------------------------
    0.500000    1.418502 
    0.600000    1.553891 
    0.700000    1.678394 
    0.800000    1.794279 
    0.900000    1.903120 
    1.000000    2.006065 
   ------------------------  

3. 20% comments:   
   5% basic information 
   5% problem description and I/O description 
   5% function description 
   5% test description

4. 10% style:   
   5% variable-name 
   5% indentation