subsitute for current file name in buffer in emacs

[shankarrg]

suppose i need to use the file name which is currently present in buffer
opened before me in emacs ..

now suppose it is a .cpp file  say abc.cpp 

now to compile this file i have to use        ...\g++  abc.cpp


now  instead for putting abc.cpp  is there a variable or command which
substitutes itself as the file name in current buffer  when used ? 
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