/in/foo.cc: In function 'int main()':
/in/foo.cc:5:18: warning: unused variable 'c' [-Wunused-variable]
  int a=100,b=100,c=10,d=10,i;
                  ^
/in/foo.cc:5:23: warning: unused variable 'd' [-Wunused-variable]
  int a=100,b=100,c=10,d=10,i;
                       ^