The following is the ITCS's assignment 3 grading policy:  
 1.30% The program can pass complie process -  There is no errors reports
       after program had been compiled in VC environment. 
 
 2.30% The correctness of the program -
      (a,b,c)=(1,4,4)   ==> (s1,s2)=(-2.000000,-2.000000)
      (a,b,c)=(1,-4,3)  ==> (s1,s2)=(3.000000,1.000000)
      (a,b,c)=(1,2,4)   ==> (s1,s2)=(-1.000000 +i 1.732051,-1.000000 ¡Vi 1.732051)
 
      (a,b,c)=(4,4,1)   ==> (s1,s2)=(-0.500000,-0.500000)
      (a,b,c)=(3,-4,1)  ==> (s1,s2)=(1.000000,0.333333)
      (a,b,c)=(3,3,3)   ==> (s1,s2)=(-0.500000 +i 0.866025,-0.500000 -i 0.866025)
 
 3.20% comments:   
      5% basic information
      5% problem description and I/O description.
      5% function description
      5% test description 
 
 4.20% style:  
      5% file-name (xxxxxxxxx_3.c,xxxxxxxxx is your student id number)    
      5% is I/O interface friendly?
      5% variable-name
      5% indentation