c++ ifstreamread

The read function in C++ is used to read a specified number of bytes from a file into a character array. It is a member function of the ifstream class which is used for input operations on files.

Syntax:

istream& read (char* s, streamsize n);

Parameters:

• s: Pointer to an array of characters where the read data is stored.
• n: Number of bytes to be read from the file.

Return Value:

• The function returns the input stream object istream.

Example Usage:

#include <iostream>
#include <fstream>

using namespace std;

int main () {
  ifstream file("example.txt", ios::binary);

  if (file.is_open()) {
    char buffer[5];
    file.read(buffer, 5);

    for (int i = 0; i < 5; i++) {
      cout << buffer[i];
    }

    file.close();
  }

  return 0;
}

In this example, the read function is used to read the first 5 bytes from the file "example.txt" into a character array named buffer. The cout statement is then used to print the contents of buffer to the console