Compilare: user.cpp: In function ‘void infix2postfix()’: user.cpp:71: warning: comparison between signed and unsigned integer expressions user.cpp:66: warning: unused variable ‘p’ user.cpp: In function ‘long long int numar(char*)’: user.cpp:125: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void eval_postfix()’: user.cpp:157: warning: format ‘%ld’ expects type ‘long int’, but argument 3 has type ‘long long int’ user.cpp: In function ‘void citire()’: user.cpp:162: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result user.cpp: In function ‘long long int operatie(int, int, char)’: user.cpp:138: warning: control reaches end of non-void function user.cpp: In function ‘int st_prior(char)’: user.cpp:60: warning: control reaches end of non-void function