C++ Input and Output Functions

Posted on December 14, 2022 • 2 minutes • 215 words

1. Output Functions.

The output functions display the results to the user.

output

Syntax:

#include <iostream>

std::cout << "message" ;

std::cout << variables;

Example:

#include <iostream>

int main() {    
    // print strings
    std::cout << "Welcome to #anooptube\n";

    int age = 18;
    double salary = 12000.50;

    // print the variables
    std::cout << age << std::endl;
    std::cout << salary << std::endl;

    // print two or more variables
    std::cout << "Your age is: " << age << " and salary is: " << salary << std::endl;

    return 0;
}

To print a new line, use std::endl or \n

2. Input Functions.

Data is accepted from the user through input functions

input

Syntax:

#include <iostream>

std::cin >> variable_name ;

Example:

#include <iostream>

int main() {     
    int age;
    std::cin >> age;
    return 0;
}

Sample Program

Print name and age from user.

#include <iostream>

int main() {    
    // accept name from user
    std::string name;
    std::cout << "Enter your name:";
    std::cin >> name;

    // accept age from user
    int age;
    std::cout << "Enter your age:";
    std::cin >> age;

    // print the result
    std::cout << "Your name is: " << name << std::endl;
    std::cout << "Your age is: " << age << std::endl;
    return 0;
}

std::string is a data-type in c++.
For more refer string