Question

我正在尝试编写一个写入已存在文件的简单程序。我收到了这个错误：

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，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

其中有两个错误：

hello3.txt是一个字符串，因此应该用引号括起来。
std :: ofstream :: close（）是一个函数，因此需要括号。

更正后的代码如下所示：

#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：此代码会覆盖以前在该文件中的所有内容。

使用Ubuntu gedit写入文件

1 个答案: