Compilare: user.c: In function 'euler': user.c:57: warning: implicit declaration of function 'memset' user.c:57: warning: incompatible implicit declaration of built-in function 'memset' user.c:71: warning: suggest parentheses around comparison in operand of & user.c: In function 'main': user.c:106: warning: incompatible implicit declaration of built-in function 'memset' user.c:111: warning: 'return' with no value, in function returning non-void