Read string from standard input in C++

This post will discuss how to read a string from standard input in C++.

1. Using `std::getline`

A simple solution is to use the std::getline function, which extracts characters from the input stream and stores them into the specified string until a delimiter is found. Here’s what the code would look like:

#include <iostream>

#include <string>

int main()

{

std::string line;

std::getline(std::cin, line);

std::cout << line << std::endl;

return 0;

}

Download Run Code

We can extend the solution to continuously read lines until an empty line is encountered.

#include <iostream>

#include <string>

int main()

{

std::string line;

while (std::getline(std::cin, line) && !line.empty()) {

std::cout << line << std::endl;

}

return 0;

}

Download Run Code

2. Using `std::cin`

Alternatively, we can use std::cin to read from the standard input. The std::cin represents the standard input stream, in the same way std::cout represents the standard output stream.

#include <iostream>

#include <string>

int main()

{

int i;

std::cin >> i;

std::cout << i << std::endl;

double d;

std::cin >> d;

std::cout << d << std::endl;

std::string s;

std::cin >> s;

std::cout << s << std::endl;

return 0;

}

Download Run Code

That’s all about reading a string from standard input in C++.

Read string from standard input in C++

1. Using std::getline

2. Using std::cin

Share this:

1. Using `std::getline`

2. Using `std::cin`