c++ - 使用 Ubuntu gedit 写入文件

Question

我正在尝试编写一个简单的程序来写入一个已经存在的文件。我收到此错误:

hello2.txt: file not recognized: File truncated
collect2: ld returned 1 exit status

我做错了什么？ (我尝试了两种方式的斜线，但我仍然得到同样的错误。)

#include<iostream>
#include<fstream>
using namespace std;

int main()
{
    ofstream outStream;
    outStream.open(hello3.txt);
    outStream<<"testing";
    outStream.close;

    return 0;
}

Answer 1

里面有两个错误:

1. hello3.txt 是一个字符串，因此应该用引号引起来。

2. std::ofstream::close() 是一个函数，因此需要括号。

修改后的代码如下所示:

#include <iostream>
#include <fstream>

int main()
{
    using namespace std; // doing this globally is considered bad practice.
        // in a function (=> locally) it is fine though.

    ofstream outStream;
    outStream.open("hello3.txt");
    // alternative: ofstream outStream("hello3.txt");

    outStream << "testing";
    outStream.close(); // not really necessary, as the file will get
        // closed when outStream goes out of scope and is therefore destructed.

    return 0;
}

请注意:此代码会覆盖该文件中之前的任何内容。