/in/foo.c: In function 'main':
/in/foo.c:5:15: warning: unused variable 'k' [-Wunused-variable]
     int n,i,j,k=0;
               ^
/in/foo.c:5:13: warning: unused variable 'j' [-Wunused-variable]
     int n,i,j,k=0;
             ^