Compilare: user.cpp: In function ‘bool Check(int, int, int)’: user.cpp:89:26: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if( x <= 20 && x != 1 && x != 2 || x==60) ^ user.cpp: In function ‘void WriteNumber(int, int, int)’: user.cpp:145:6: warning: unused variable ‘l1’ [-Wunused-variable] int l1(0),l2(0),l3(0); ^ user.cpp:145:12: warning: unused variable ‘l2’ [-Wunused-variable] int l1(0),l2(0),l3(0); ^ user.cpp:145:18: warning: unused variable ‘l3’ [-Wunused-variable] int l1(0),l2(0),l3(0); ^ user.cpp: In function ‘bool Check(int, int, int)’: user.cpp:140:1: warning: control reaches end of non-void function [-Wreturn-type] } ^