Compilare: user.c: In function ‘bin’: user.c:25: warning: implicit declaration of function ‘changemat’ user.c:26: warning: implicit declaration of function ‘suma’ user.c: In function ‘cit’: user.c:40: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result user.c:43: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result user.c: At top level: user.c:86: warning: conflicting types for ‘changemat’ user.c:25: note: previous implicit declaration of ‘changemat’ was here