Compilare: user.cpp: In function 'int okpara(char*)': user.cpp:16: warning: comparison between signed and unsigned integer expressions user.cpp: In function 'char* pozop(char*)': user.cpp:30: warning: comparison between signed and unsigned integer expressions user.cpp: In function 'int eval_expresie(char*)': user.cpp:46: warning: converting to non-pointer type 'char' from NULL user.cpp:55: warning: converting to non-pointer type 'char' from NULL user.cpp: In function 'void scoate_var(char*, int*)': user.cpp:83: warning: comparison between signed and unsigned integer expressions user.cpp: In function 'void hash(char*)': user.cpp:90: warning: comparison between signed and unsigned integer expressions user.cpp: In function 'int eval_expresie(char*)': user.cpp:79: warning: control reaches end of non-void function /tmp/ccsySQEe.o: In function `main': user.cpp:(.text+0x372): warning: the `gets' function is dangerous and should not be used.