Eroare de compilare: user.cpp: In function ‘std::string clear(std::string&)’: user.cpp:43:55: error: ‘remove_if’ was not declared in this scope val.erase(remove_if(val.begin(), val.end(), ::isspace), val.end()); ^ user.cpp: In function ‘void convert(FILE*, FILE*)’: user.cpp:99:41: error: ‘strchr’ was not declared in this scope while (line != NULL && strchr(line, '}') == NULL) { ^ user.cpp:97:23: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(line, 1024, in); ^ user.cpp:101:24: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(line, 1024, in); ^ user.cpp:108:24: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(line, 1024, in); ^