Compilare: user.c: In function ‘read’: user.c:28: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result user.c:36: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result user.c: In function ‘main’: user.c:118: warning: unused variable ‘new_val’ user.c:118: warning: unused variable ‘j’ user.c:121: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result user.c: In function ‘parent’: user.c:113: warning: control reaches end of non-void function