Compilare: user.cpp: In function ‘int c()’: user.cpp:74:23: warning: the address of ‘int b()’ will never be NULL [-Waddress] if(b==0){ ^ user.cpp: In function ‘int main()’: user.cpp:92:17: warning: unused variable ‘nr’ [-Wunused-variable] int nr=b(); ^ user.cpp:99:21: warning: unused variable ‘nr’ [-Wunused-variable] int nr=c(); ^ user.cpp:107:25: warning: unused variable ‘nr’ [-Wunused-variable] int nr=b(); ^ user.cpp:114:29: warning: unused variable ‘nr’ [-Wunused-variable] int nr=c(); ^ user.cpp: In function ‘int b()’: user.cpp:54:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int c()’: user.cpp:81:1: warning: control reaches end of non-void function [-Wreturn-type] } ^