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;
}read text from file c++
#include<iostream>
#include<fstream>
using namespace std;
int main() {
ifstream myReadFile;
myReadFile.open("text.txt");
char output[100];
if (myReadFile.is_open()) {
while (!myReadFile.eof()) {
myReadFile >> output;
cout<<output;
}
}
myReadFile.close();
return 0;
}how to open an input file in c++
#include <fstream>
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;Reading From A File In C++
#include <iostream>
#include <fstream>
using namespace std;
int main() {
fstream my_file;
my_file.open("my_file.txt", ios::in);
if (!my_file) {
cout << "No such file";
}
else {
char ch;
while (1) {
my_file >> ch;
if (my_file.eof())
break;
cout << ch;
}
}
my_file.close();
return 0;
}c++ read matttrix from text file
ifstream f("matrix.txt");
f >> m >> n;
if ((m != 4) || (n != 3))
{
cout << "Matrix not 4 by 3!n";
return 1;
}
for (int i = 0; i < m; i++)
for (int j = 0; j < m; j++)
f >> A[i][j];Copyright © 2021 Codeinu
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