代码如下:
void Utilities::readFile(const string file_name, vector<double>& histogram){
ifstream in(file_name.c_str(), ios_base::in);
if(in == NULL){
cout << "Error:open data file error.\n";
getchar();
exit(0);
}
string str;
const string delimiters = " ";
getline(in, str);
tokenize(str, histogram, delimiters);
}