Compilare: user.c: In function ‘main’: user.c:56:9: warning: unused variable ‘suma’ [-Wunused-variable] int suma; ^ user.c:55:21: warning: unused variable ‘j’ [-Wunused-variable] int nr_valori,i,j; ^ user.c:55:19: warning: unused variable ‘i’ [-Wunused-variable] int nr_valori,i,j; ^ user.c:55:9: warning: variable ‘nr_valori’ set but not used [-Wunused-but-set-variable] int nr_valori,i,j; ^ user.c: In function ‘ultima_cifra’: user.c:52:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.c: In function ‘main’: user.c:62:10: warning: ignoring return value of ‘fgets’, declared with attribute warn_unused_result [-Wunused-result] fgets(x,100,f); ^