C++ ostream

The C++ ostream class provides a set of functions and operators for writing data as output.

Before using ostream, we need to include the <iostream> header in our program.

#include <iostream>

C++ Insertion Operator <<

To write data to the console using ostream, we can use the cout object with the insertion operator << operator.

#include <iostream>
using namespace std;

int main() {

    int entered_number;

// write the text "Hello World!" to the screen cout << "Hello World!";
return 0; }

Output

Hello World!

C++ put() Function

The put() function of ostream is primarily used to write characters to the console. For example,

#include <iostream>
using namespace std;

int main() {

    char ch = 'A';

// print a character to the console cout.put(ch);
cout<< endl ;
// print another character to the console cout.put('C');
return 0; }

Output

A
C

C++ write() Function

The write() function of ostream is generally used to write blocks of data into the console. For example,

#include <iostream>
#include <cstring>

using namespace std;

int main() {

    // create a C-string
    const char* str = "Hello, World!";

// print the C-string cout.write(str, strlen(str));
return 0; }

Output

Hello, World!

Here, we have written a C-string Hello, World to the output stream using the write() function.

Note: We have used a C-string with the write() function because it doesn't work with std::string objects of C++.

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