Compilare: user.c: In function ‘add’: user.c:19: warning: assignment from incompatible pointer type user.c:21: warning: assignment from incompatible pointer type user.c: In function ‘dft’: user.c:34: warning: passing argument 1 of ‘add’ from incompatible pointer type user.c:16: note: expected ‘struct node **’ but argument is of type ‘struct node *’ user.c: In function ‘main’: user.c:55: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result user.c:58: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result