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Computer Science · Class 10 · Chapter 10: Input/Output Handling in C++

8 min

Key points

Input/Output operations in C++ are performed using stream objects that handle data flow
cin is the standard input stream object used to read data from keyboard
cout is the standard output stream object used to display data on screen
Extraction operator (>>) is used with cin to input data from user
Insertion operator (<<) is used with cout to output data to screen
getline() function is used to read complete line including spaces
Header file iostream.h must be included for input/output operations
Formatting functions like setw(), setprecision() help control output display
File handling allows programs to store and retrieve data from external files

Definitions

Stream: A stream is a sequence of bytes that flows from source to destination. It provides a uniform interface for input and output operations.
Input Stream: An input stream is a stream that brings data into the program from an external source like keyboard or file.
Output Stream: An output stream is a stream that sends data from the program to an external destination like screen or file.
Extraction Operator: The extraction operator (>>) extracts or reads data from the input stream and stores it in variables.
Insertion Operator: The insertion operator (<<) inserts or writes data from variables to the output stream.

Worked example

Write a C++ program that takes two numbers as input and displays their sum. Also explain the header file used. (6 marks)

#include<iostream> using namespace std; int main() { int a, b, sum; cout<<"Enter two numbers: "; cin>>a>>b; sum = a + b; cout<<"Sum is: "<<sum; return 0; } The iostream header file contains definitions for input/output stream objects like cin and cout.

Common mistakes

Students often confuse >> with << operators - remember >> extracts (input), << inserts (output)
Forgetting to include iostream.h header file before using cin/cout
Using cin for strings with spaces - use getline() instead of cin >> for complete sentences
Not understanding that cin stops reading at first space character
Writing cout >> instead of cout << for output operations

Quick recap

Input/output in C++ uses iostream header file. cin is input stream object for taking data from keyboard. cout is output stream object for displaying data on screen. Use >> operator with cin and << operator with cout.

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