Compilare: user.c: In function ‘main’: user.c:27: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result user.c:31: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result user.c:32: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result user.c: In function ‘euclid’: user.c:14: warning: control reaches end of non-void function