In C++ programming we’re utilizing the iostream commonplace library, it gives cin and cout strategies for studying from enter and writing to output respectively.
To learn and write from a file we’re utilizing the usual C++ library known as fstream. Allow us to see the information varieties outline in fstream library is:
| Knowledge Kind | Description |
|---|---|
| fstream | It’s used to create information, write information to information, and skim information from information. |
| ifstream | It’s used to learn information from information. |
| ofstream | It’s used to create information and write information to the information. |
C++ FileStream instance: writing to a file
Let’s see the straightforward instance of writing to a textual content file testout.txt utilizing C++ FileStream programming.
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#embody <iostream>#embody <fstream>utilizing namespace std;int important () { ofstream filestream("testout.txt"); if (filestream.is_open()) {filestream << "Welcome to javaTpoint.n";filestream << "C++ Tutorial.n";filestream.shut(); } else cout <<"File opening is fail."; return 0;}</fstream></iostream> |
Output:
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The content material of a textual content file <strong>testout.txt</strong> is about with the information:Welcome to javaTpoint.C++ Tutorial. |
C++ FileStream instance: studying from a file
Let’s see the straightforward instance of studying from a textual content file testout.txt utilizing C++ FileStream programming.
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#embody <iostream>#embody <fstream>utilizing namespace std;int important () { string srg; ifstream filestream("testout.txt"); if (filestream.is_open()) {whereas ( getline (filestream,srg) ){ cout << srg <<endl;}filestream.shut(); }="" else="" {="" cout="" <<="" "file="" opening="" is=""></endl;}filestream.close();><endl; }="" return=""></endl;></fstream></iostream> |
Be aware: Earlier than operating the code a textual content file named as “testout.txt” is have to be created and the content material of a textual content file is given under:
Welcome to javaTpoint.
C++ Tutorial.
Output:
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Welcome to javaTpoint.C++ Tutorial. |
C++ Learn and Write Instance
Let’s see the straightforward instance of writing the information to a textual content file testout.txt after which studying the information from the file utilizing C++ FileStream programming.
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#embody <fstream>#embody <iostream>utilizing namespace std;int important () { char enter[75]; ofstream os; os.open("testout.txt"); cout <<"Writing to a textual content file:" << endl; cout << "Please Enter your title: ";cin.getline(enter, 100); os << enter << endl; cout << "Please Enter your age: ";cin >> enter; cin.ignore(); os << enter << endl; os.shut(); ifstream is;string line; is.open("testout.txt");cout << "Studying from a textual content file:" << endl;whereas (getline (is,line)) { cout << line << endl; } is.shut(); return 0;}</iostream></fstream> |
Output:
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Writing to a textual content file: Please Enter your title: Nakul JainPlease Enter your age: 22 Studying from a textual content file: Nakul Jain 22 |
