Compilare: user.cpp: In function ‘bool numar()’: user.cpp:23:9: warning: unused variable ‘k’ [-Wunused-variable] int k=0; ^ user.cpp: In function ‘bool NOT()’: user.cpp:56:7: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(k==1) ^ user.cpp: In function ‘bool AND()’: user.cpp:73:7: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(k==1) ^ user.cpp: In function ‘bool numar()’: user.cpp:42:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘bool NOT()’: user.cpp:60:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘bool AND()’: user.cpp:77:1: warning: control reaches end of non-void function [-Wreturn-type] } ^