Main.cc: In function 'int main()':
Main.cc:5:10: error: 'a' was not declared in this scope
cin>>a>>b>>c;
^
Main.cc:5:13: error: 'b' was not declared in this scope
cin>>a>>b>>c;
^
Main.cc:5:16: error: 'c' was not declared in this scope
cin>>a>>b>>c;
^
Main.cc:4:9: warning: unused variable 'abc' [-Wunused-variable]
int abc;
^