/in/foo.c: In function 'main':
/in/foo.c:7:5: error: stray '\' in program
  z=n\10;
     ^
/in/foo.c:7:6: error: expected ';' before numeric constant
  z=n\10;
      ^~
/in/foo.c:5:15: warning: unused variable 'a' [-Wunused-variable]
     int n,x,z,a;
               ^