在 C++ 中向文件添加换行符

Question

任何人都可以帮助我处理文件处理中的这个简单的事情吗？

以下是我的代码：

#include<iostream>
#include<fstream>
using namespace std;
int main()
{
  ofstream savefile("anish.txt");
  savefile<<"hi this is first program i writer" <<"\n this is an experiment";
  savefile.close();
  return 0 ;
}

现在运行成功了，我想按照我的方式格式化文本文件的输出

我有：

hi this is first program i writer this is an experiment

如何使我的输出文件如下所示：

hi this is first program 
I writer this is an experiment 

我应该怎么做才能以这种方式格式化输出？

Answer 1

#include <fstream>
using namespace std;

int main(){
 fstream file;
 file.open("source\\file.ext",ios::out|ios::binary);
 file << "Line 1 goes here \n\n line 2 goes here";

 // or

 file << "Line 1";
 file << endl << endl;
 file << "Line 2";
 file.close();
}

再一次，希望这就是你想要的=）

Answer 2

首先，您需要打开流以写入文件：

ofstream file; // out file stream
file.open("anish.txt");

之后，您可以使用

<<

运算符写入文件：

file << "hi this is first program i writer";

此外，使用

std::endl

代替

\n

：

file << "hi this is first program i writer" << endl << "this is an experiment";

Answer 3

// Editor: MS visual studio 2019
// file name in the same directory where c++ project is created
// is polt ( a text file , .txt)
//polynomial1 and polynomial2 were already written
//I just wrote the result manually to show how to write data in file
// in new line after the old/already data
#include<iostream>
#include<string>
#include<fstream>
using namespace std;
int main()
{
    fstream file;
    file.open("poly.txt", ios::out | ios::app);
    if (!file) {
        cout << "File does not exist\n";
    }
    else
    {
        cout << "Writing\n";
            file << "\nResult: 4x4 + 6x3 + 56x2 + 33x1 + 3x0";  
    }
    system("pause");
    return 0;
}

**OUTPUT:** after running the data in the file would be
polynomial1: 2x3 + 56x2-1x1+3x0
polynomial2: 4x4+4x3+34x1+x0
Result: 4x4 + 6x3 + 56x2 + 33x1 + 3x0
The code is contributed by Zia Khan

Answer 4

使用

ios_base::app

代替（添加行而不是覆盖）：

#include<fstream>

using namespace std;

int main()
{
    ofstream savefile("anish.txt", ios_base::app);
    savefile<<"hi this is first program i writer" <<"\n this is an experiment";
    savefile.close();
    return 0 ;
}