User Program Communication
Write to File in C++
Used to write to a file.
Syntax
#include <iostream>
#include <fstream>
using namespace std;
ofstream newFile;
newFile.open(fileName);
if (openFile.is_open()){ //checking for existence of file
openFile << valueToWrite;
openFile.close(); //closes file after done
}Notes
Ofstream is an object created which represents the file being written to.
Example
#include <iostream>
#include <fstream>
using namespace std;
int main(){
ofstream helloWorld;
helloWorld.open("helloworld.txt");
if (helloWorld.is_open()){ //checking for existence of file
helloWorld << "Hello, World!";
helloWorld.close(); //closes file after done
}
}