/in/foo.cc: In function 'int main()':
/in/foo.cc:5:8: warning: unused variable 'b' [-Wunused-variable]
  int a,b,s,g,z;
        ^
/in/foo.cc:5:10: warning: unused variable 's' [-Wunused-variable]
  int a,b,s,g,z;
          ^
/in/foo.cc:5:12: warning: unused variable 'g' [-Wunused-variable]
  int a,b,s,g,z;
            ^
/in/foo.cc:5:14: warning: unused variable 'z' [-Wunused-variable]
  int a,b,s,g,z;
              ^