/in/foo.cc: In function 'int main()':
/in/foo.cc:5:8: warning: unused variable 'b' [-Wunused-variable]
    5 |  int a,b,t;
      |        ^
/in/foo.cc:5:10: warning: unused variable 't' [-Wunused-variable]
    5 |  int a,b,t;
      |          ^