/in/foo.cc: In function 'int main()':
/in/foo.cc:5:8: warning: unused variable 'n' [-Wunused-variable]
  int i,n=12,x,s=0,s1=0,k,t,b,a[12];
        ^
/in/foo.cc:5:28: warning: unused variable 'b' [-Wunused-variable]
  int i,n=12,x,s=0,s1=0,k,t,b,a[12];
                            ^