Compilare: user.c: In function ‘Euclid’: user.c:6:9: warning: unused variable ‘r’ [-Wunused-variable] int r; ^ user.c:10:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.c: In function ‘main’: user.c:18:10: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%i",&n); ^ user.c:22:14: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%i %i",&i,&j); ^