/in/foo.c: In function 'main':
/in/foo.c:8:16: warning: unused variable 'c' [-Wunused-variable]
  int n,a=1,b=2,c=3,num;
                ^
/in/foo.c:8:12: warning: unused variable 'b' [-Wunused-variable]
  int n,a=1,b=2,c=3,num;
            ^
/in/foo.c:8:8: warning: unused variable 'a' [-Wunused-variable]
  int n,a=1,b=2,c=3,num;
        ^