Eroare de compilare: user.cpp:73:8: error: ISO C++ forbids declaration of ‘crtval’ with no type [-fpermissive] crtval() ^ user.cpp: In function ‘bool fand()’: user.cpp:134:9: warning: unused variable ‘t’ [-Wunused-variable] int t; ^ user.cpp: In function ‘bool expresie()’: user.cpp:146:9: warning: unused variable ‘t’ [-Wunused-variable] int t; ^ user.cpp: In function ‘int main()’: user.cpp:157:13: warning: unused variable ‘a’ [-Wunused-variable] int n,i,a=0; ^