/in/foo.cc: In function 'int main()':
/in/foo.cc:7:12: warning: unused variable 'c' [-Wunused-variable]
    int a,b,c,d,e;
            ^
/in/foo.cc:7:14: warning: unused variable 'd' [-Wunused-variable]
    int a,b,c,d,e;
              ^
/in/foo.cc:7:16: warning: unused variable 'e' [-Wunused-variable]
    int a,b,c,d,e;
                ^