read a file c++
// reading a text file
#include <iostream>
#include <fstream>
#include <string>
using namespace std;
int main () {
string line;
ifstream myfile ("example.txt");
if (myfile.is_open())
{
while ( getline (myfile,line) )
{
//use line here
}
myfile.close();
}
else cout << "Unable to open file";
return 0;
}file handling in c++
// basic file operations
#include <iostream>
#include <fstream>
using namespace std;
int main () {
ofstream myfile;
myfile.open ("example.txt");
myfile << "Writing this to a file.\n";
myfile.close();
return 0;
}how to read and write in a file c++
#include <iostream>
#include <fstream>
using namespace std;
ifstream file_variable; //ifstream is for input from plain text files
file_variable.open("input.txt"); //open input.txt
file_variable.close(); //close the file stream
/*
Manually closing a stream is only necessary
if you want to re-use the same stream variable for a different
file, or want to switch from input to output on the same file.
*/
_____________________________________________________
//You can also use cin if you have tables like so:
while (cin >> name >> value)// you can also use the file stream instead of this
{
cout << name << value << endl;
}
_____________________________________________________
//ifstream file_variable; //ifstream is for input from plain text files
ofstream out_file;
out_file.open("output.txt");
out_file << "Write this scentence in the file" << endl;file handling in c++
#include <iostream>
#include <fstream>
#include <cstring>
#include <process.h>
using namespace std;
int main()
{
char name[999]; //Used to store data
ofstream writeMode; //Created object of ofstream
writeMode.open("name.dat"); //Opened the file in write mode
cout<<"******** Writing into file ********"<<endl;
cout<<"Enter your name: ";
cin.getline(name, 999); //Accepts string with spaces and after spaces eg ____ ____
writeMode<<name<<endl; //Putted data inside the file
cout<<"Enter your age: ";
cin>>name;
cin.ignore(); //Wrote because number is accepted :P, may be
writeMode<<name<<endl; //Again putted data inside the file
writeMode.close(); //Closed the write mode
ifstream readMode; //Created object of ifstream
readMode.open("name.dat"); //Opened the file in read mode.
cout<<"******** Reading into file ********"<<endl;
readMode>>name;
cout<<name<<endl; //Write the data to the screen
readMode>>name; //again read the data from the file and display it
cout<<name<<endl;
readMode.close(); //Closed the read mode
system("pause");
return 0;
}Copyright © 2021 Codeinu
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