/in/foo.cc: In function 'int main()':
/in/foo.cc:4:8: warning: unused variable 'b' [-Wunused-variable]
  int a,b,c,t=0,x=0,m=-99;
        ^
/in/foo.cc:4:10: warning: unused variable 'c' [-Wunused-variable]
  int a,b,c,t=0,x=0,m=-99;
          ^
/in/foo.cc:4:12: warning: unused variable 't' [-Wunused-variable]
  int a,b,c,t=0,x=0,m=-99;
            ^