expresie2.cpp: In function 'int Cauta(char)': expresie2.cpp:35: warning: NULL used in arithmetic expresie2.cpp: In function 'int Numar(int&)': expresie2.cpp:47: warning: NULL used in arithmetic expresie2.cpp: In function 'void Transforma(int, int)': expresie2.cpp:118: warning: NULL used in arithmetic expresie2.cpp: In function 'int main()': expresie2.cpp:134: warning: unused variable 'pp' expresie2.cpp:128: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result