# C++输出

1.定义一个输出三重向量的函数。

``````void output_3Dvector(string path, vector<vector<vector<double>>> vec)
{
ofstream outfile3D(path);
outfile3D<<vec.size()<<vec.at(0).size()<<vec.at(0).at(0).size()<<endl;
for(size_t i=0;i<vec.size();i++){
for(size_t j=0;j<vec.at(i).size();j++){
for (size_t k=0;k<vec.at(i).at(j).size();k++) {
outfile3D <<  vec.at(i).at(k).at(0)<< "," << vec.at(i).at(k).at(1) << "," << vec.at(i).at(k).at(2) << "," <<vec.at(i).at(k).at(3) << " ," <<vec.at(i).at(k).at(4) << "," <<vec.at(i).at(k).at(5) << endl;//Dlib点深度数据X,Y，Z
}
}
}
outfile3D.close();
}
``````

# C++输入流

``````ifstream infile;//定义读取文件流，相对于程序来说是in
infile.open(txt);//打开文件
string line;
vector<double> vector0;
vector0.resize(3);
if (infile.eof())
{
infile.close();
cout<<"error open"<<endl;
}
if  (getline(infile, line)) {
istringstream sin(line);
std::vector<string> fields;
string field;
while (getline(sin, field, '\t')) {
fields.push_back(field);
}
vector0.at(0)=atof(fields.at(1).data());
vector0.at(1)=atof(fields.at(2).data());
vector0.at(2)=atof(fields.at(3).data());
}
infile.close();
``````