Update Source.cpp

This version will handle the following input::
F
- 5.2 3.1      
+ 7 2.5       
* 3 5 
/ 5 0             
/ 6 2	    
% 8.3 5.1 
^ 2 3	    
E
S 40  
f
S 40
C 60      	
e
T 30

Still need ways of handling '•' and "(times)"
There also seems to be an anomaly in the line break at the line "%  8.3       5.1           " that prevents getline() from advancing.