how to read from file c++ code example
Example 1: read a file c++
#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) )
{
}
myfile.close();
}
else cout << "Unable to open file";
return 0;
}
Example 2: c++ files
#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;
}
Example 3: how to read and write in a file c++
#include <iostream>
#include <fstream>
using namespace std;
ifstream file_variable;
file_variable.open("input.txt");
file_variable.close();
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while (cin >> name >> value)
{
cout << name << value << endl;
}
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ofstream out_file;
out_file.open("output.txt");
out_file << "Write this scentence in the file" << endl;
Example 4: How to read a file in in C++
#include <iostream>
#include <iomanip>
#include <fstream>
using namespace std;
int main() {
int sum = 0;
int x;
ifstream inFile;
inFile.open("test.txt");
if (!inFile) {
cout << "Unable to open file";
exit(1);
}
while (inFile >> x) {
sum = sum + x;
}
inFile.close();
cout << "Sum = " << sum << endl;
return 0;
}
Example 5: file reading c++
int a, b;
ifstream bd;
myfile.open("file.txt");
if (myfile.is_open())
while (bd >> a >> b)
cout << a << b << endl;
else cout << "ERROR";