Compilare: user.cpp: In function ‘void eval(char*, nod*&)’: user.cpp:20: warning: comparison between signed and unsigned integer expressions user.cpp:26: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int getNumber(nod*)’: user.cpp:127: warning: comparison between signed and unsigned integer expressions user.cpp:126: warning: unused variable ‘p’ user.cpp: In function ‘void citire()’: user.cpp:168: warning: comparison between signed and unsigned integer expressions user.cpp:166: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result user.cpp: In function ‘int resultat(nod*)’: user.cpp:150: warning: control reaches end of non-void function