Compilare: main.cpp: In member function 'int Ecuation::getNum(char&)': main.cpp:60:8: warning: statement has no effect [-Wunused-value] for (curr ; '0' <= curr && curr <= '9' ; ret = ret * 10 + (curr - '0'), curr = fgetc(in)) ; ^~~~ main.cpp: In function 'int main(int, const char**)': main.cpp:89:23: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &n) ; ^