将数据保存为txt c++

采用c++中的fstream对数据进行写入操作，保存为txt格式，代码编写如下，亲测可用：

#include 
#include 
#include 
#include 

using namespace std;

int size = 9;
unsigned long txtCount = 2; 
int main() {
string txt_path = "out-data/"; 
string txt_name = txt_path + to_string(txtCount) + ".txt";
ofstream output_stream;  //(txt_name)
output_stream.open(txt_name);
output_stream << "# index " << "n";
for(int i=0; i
    output_stream << std::to_string(i);
	output_stream << " ";
    output_stream << endl; 
}

//txtCount = txtCount + 1;
output_stream.close();
return 0;
}

结果如下图所示：