C++ 程序：从文件中读取

原文：https://www.studytonight.com/cpp-programs/cpp-reading-from-a-file-program

大家好！

在本教程中，我们将学习如何用 C++ 编程语言打开并读取文件的内容。

为了从基础上理解这个概念，我们强烈建议您参考这个: C++ 文件流，在这里我们详细讨论了这个概念以及其中涉及的各种术语。

分步注释代码如下所示:

代号:

#include<iostream>
#include<fstream>  //to make use of system defined functions for file handling

using namespace std;

int main()
{
    cout << "\n\nWelcome to Studytonight :-)\n\n\n";
    cout << " =====  Program to demonstrate how to read the contents from a file ===== \n\n";

    //declaration of a string variable
    string str;

    // creating a variable of type ifstream to make use of file handling commands and open a file in read mode.
    ifstream in;

    //open is a system defined method to open and read from the mentioned file
    in.open("studytonight.txt");

    //Make sure that the file is within the same folder as that of this program otherwise, will have to provide the entire path to the file to read from

    cout << "Reading content from the file and it's contents are: \n\n";

    // printing the data word by word
    while(in>>str)
        cout << str << " ";

    cout << "\n\n\n";

    // close the file opened before.
    in.close();

    return 0;
}

study south . txt文件的内容是:

Studytonight: Our mission is to empower young Students to be the inventors and creators.

输出:

我们希望这篇文章能帮助你更好地理解用 C++ 从文件中读取内容的概念。如有任何疑问，请随时通过下面的评论区联系我们。

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