Input and Output (I/O) are fundamental concepts in programming.
- Input allows a program to receive data from the user, files, or other sources, while output allows it to display results.
- I/O is essential for creating interactive programs and performing tasks with dynamic data.
Input Output in C
stdio.h is the library in C that provides functions for input and output, like printf() and scanf().
- printf() is used to display messages or values on the screen. You can print text, numbers, and variables.
- scanf() is used to read input from the user and requires a format specifier to know the type of data.
- \n is used to move to a new line so that the next output appears below the previous one.
- Format specifiers tell C what type of data to read or print, for example: %d for integers, %f for floats, %c for characters, and %s for strings.
Input:
20 5.9 A Alice
Output:
Your age: 20
Your height: 5.90
Your grade: A
Your name: Alice
Input Output in CPP
#include <iostream> is the library in Cpp that provides input/output functions like cout and cin.
- cout is used to display messages or values on the screen. You can print text, numbers, and variables.
- cin is used to read input from the user. The variable type determines the kind of input it accepts.
- \n or endl is used to move to a new line in output.
Input:
20 5.9 A Alice
Output:
Your age: 20
Your height: 5.9
Your grade: A
Your name: Alice
Input Output in Java
Scanner (from java.util.Scanner) is used for input, and System.out is used for output.
- System.out.println() displays messages or values on the screen and moves to a new line.
- System.out.print() displays messages without moving to a new line.
- Scanner.nextInt(), nextFloat(), next(), nextLine() are used to read different types of input from the user.
Input:
20 5.9 A Alice
Output:
Your age: 20
Your height: 5.9
Your grade: A
Your name: Alice
Input Output in Python
Python does not require a separate library for input/output; it uses built-in functions.
- print() is used to display messages or values on the screen. You can print text, numbers, or variables.
- input() is used to read input from the user as a string; type conversion (int(), float()) is used for numbers.
- \n is used inside print() to move to a new line; print() automatically moves to a new line by default
Input:
20 5.9 A Alice
Output:
Your age: 20
Your height: 5.9
Your grade: A
Your name: Alice
Input Output in C#
System namespace provides input/output functions, and Console is used for I/O.
- Console.WriteLine() displays messages or values on the screen and moves to a new line.
- Console.Write() displays messages without moving to a new line.
- Console.ReadLine() reads input from the user as a string; type conversion is needed for other types like int.Parse() or float.Parse().
Input:
20 5.9 A Alice
Output:
Your age: 20
Your height: 5.9
Your grade: A
Your name: Alice
Input Output in JavaScript
In Node.js, input/output is handled using readline module for input and console.log() for output.
- console.log() displays messages or values on the screen and moves to a new line.
- console.print() is not standard; output is mostly done via console.log().
- Input is read using readline.question() in Node.js or prompt() in browsers.
Input:
20 5.9 A Alice
Output:
Your age: 20
Your height: 5.9
Your grade: A
Your name: Alice
