Compilare: user.cpp: In function ‘int jump_over_number(const string&, int)’: user.cpp:18:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( ; poz < str.size() && isdigit(str[poz]); ++poz); ^ user.cpp: In constructor ‘info_space::info_space(const string&)’: user.cpp:28:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < str.size(); ){ ^ user.cpp:31:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(end_of_number >= str.size() || str[end_of_number] == '+'){ ^