How to Take std::cin Input with Spaces? Last Updated : 01 Mar, 2024 Summarize Comments Improve Suggest changes Share Like Article Like Report In C++, std::cin is used to accept the input from the standard input device. By default, the delimiter used by std::cin to separate input is a whitespace. In this article, we will learn how to take std::cin input with spaces in C++. Example: Input: Hey! Geek Welcome to GfG //input with spacesOutput: Input Entered: Hey! Geek Welcome to GfGstd::cin Input with Spaces in C++To take std::cin input with spaces we need to customize the behavior of the standard input stream by treating the newline character ('\n') as a delimiter in place of a space. To achieve this use the below approach: Approach: Define a custom locale facet that modifies the character classification table used by the locale to alter how characters are interpreted by the input stream.Inside the custom locale change the classification of the newline character ('\n') to be considered as a space character. Finally, apply the custom locale by using cin.imbue() to set the locale of the std::cin with a new locale.C++ Program to Take std::cin Input with SpacesThe below program demonstrates how we can take std::cin input with spaces in C++. C++ // C++ program to take std::cin input with spaces #include <iostream> #include <locale> // to work with locales #include <string> using namespace std; // Defining a structure that inherits from ctype<char> struct changeDelimiter : ctype<char> { // Constructor for changeDelimiter changeDelimiter() : ctype<char>( createTable()) // Initializing the base class // ctype<char> with a table { } // Static function to create a table with custom // settings static mask const* createTable() { static mask rc[table_size]; // Creating a table with the // size of the character set rc['\n'] = ctype_base::space; // Set the newline // character to be treated // as whitespace return rc; // Return the modified table } }; int main() { // Creating a custom locale with the changeDelimiter // facet cin.imbue(locale(cin.getloc(), new changeDelimiter)); // prompt the user to enter the input with spaces cout << "Enter Input with Spaces: " << endl; string inputString; // Read input from cin, which has the modified locale cin >> inputString; // Print the input string cout << "Input Entered: " << inputString << endl; } Output Enter Input with Spaces: Hey! 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