C++ Input/Output operation.

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C++ Input/Output operation


As in c language use scanf () for input and printf () functions for output.Similarly, we use cin >> for input in c ++ and cout << for output.






Input/Output Library Header Files

Header File Function and Description

<iostream>

It is used to define the cout, cin and cerr objects, which correspond to the standard output stream, a standard input stream and standard error stream.

<iomanip>

It is used to declare services useful for performing formatted I/O, such as set precision and set.

<fstream>

It is used to declare services for user-controlled file processing.

cout (output stream)

cout => cout means console output. This is the object of the iostream class.

<< => This is called output operator, insertion operator.


#include <iostream>  
using namespace std;  
int main( ) 
{  
   char array[] = "Welcome to C++ programming.";  
   cout << "Display name : " << array << endl;  
}
Output:

Display name : Welcome to C++ programming.

cin (input stream)

cin => cin means console input. This is the object of the iostream class.

>> => It is called input operator, extraction operator.


#include <iostream>  
using namespace std;  
int main( ) 
{
  char name[31];
   cout << "Enter your name: ";
   cin >> name;
   cout << "Your name is: " << name << endl;
}
Output:

Enter your name: rama
Your name is: rama

endl (End line).

The endl is used to insert a new line characters and flushes the stream.


#include <iostream>  
using namespace std;  
int main( ) 
{
cout << "C++ programming Tutorial";
cout << " cprogramming"<
Output:

C++ programming Tutorial cprogramming
End of line



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