/in/foo.c: In function 'chlm':
/in/foo.c:5:21: warning: unused variable 'j' [-Wunused-variable]
  int num= 0,k,m,n,i,j;
                     ^
/in/foo.c:5:19: warning: unused variable 'i' [-Wunused-variable]
  int num= 0,k,m,n,i,j;
                   ^