Compilare: user.cpp: In function ‘void readf(FILE*)’: user.cpp:165: warning: comparison between signed and unsigned integer expressions user.cpp:170: warning: comparison between signed and unsigned integer expressions user.cpp:160: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result user.cpp:161: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result user.cpp: In function ‘int evaluate(const char*, int)’: user.cpp:254: warning: suggest parentheses around ‘&&’ within ‘||’ user.cpp: In function ‘int main()’: user.cpp:294: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result