Menu
×
   ❮     
HTML CSS JAVASCRIPT SQL PYTHON JAVA PHP C C++ C# AWS W3.CSS HOW TO BOOTSTRAP REACT MYSQL JQUERY EXCEL XML DJANGO NUMPY PANDAS NODEJS DSA TYPESCRIPT ANGULAR ANGULARJS GIT POSTGRESQL MONGODB ASP AI R GO KOTLIN SWIFT SASS VUE GEN AI SCIPY CYBERSECURITY DATA SCIENCE INTRO TO PROGRAMMING INTRO TO HTML & CSS BASH RUST TOOLS

C++ Tutorial

C++ HOME C++ Intro C++ Get Started C++ Syntax C++ Output C++ Comments C++ Variables C++ User Input C++ Data Types C++ Operators C++ Type Conversion C++ Strings C++ Math C++ Booleans C++ If...Else C++ Switch C++ While Loop C++ For Loop C++ Break/Continue C++ Arrays C++ Structures C++ Enums C++ References C++ Pointers C++ Memory Mgmt

C++ Functions

C++ Functions C++ Function Parameters C++ Function Overloading C++ Scope C++ Recursion C++ Lambda

C++ Classes

C++ OOP C++ Classes/Objects C++ Class Methods C++ Constructors C++ Destructors C++ The this Pointer C++ Access Specifiers C++ Encapsulation C++ Friend Functions C++ Inheritance C++ Polymorphism C++ Operator Overload C++ Templates

C++ Files

C++ Files

C++ Date

C++ Date

C++ Errors

C++ Errors C++ Debugging C++ Exceptions C++ Input Validation

C++ Problem Solving

C++ Problem Solving C++ Build the Logic C++ Test Cases

C++ Data Structures

C++ Data Structures & STL C++ Vectors C++ List C++ Stacks C++ Queues C++ Deque C++ Sets C++ Maps C++ Unordered Map C++ Unordered Set C++ Iterators C++ Algorithms

C++ Namespaces

C++ Namespaces

C++ Projects

C++ Projects

C++ Cert

C++ Certificate

C++ How To

C++ How Tos

C++ Examples

C++ Examples C++ Real-Life Examples C++ Compiler C++ Exercises C++ Quiz C++ Code Challenges C++ Practice Problems C++ Syllabus C++ Study Plan

C++ Reference

C++ Reference C++ Keywords C++ <algorithm> C++ <cctype> C++ <cmath> C++ <cstdlib> C++ <cstring> C++ <ctime> C++ <deque> C++ <fstream> C++ <iomanip> C++ <iostream> C++ <list> C++ <map> C++ <memory> C++ <queue> C++ <random> C++ <set> C++ <sstream> C++ <stack> C++ <stdexcept> C++ <string> C++ <unordered_map> C++ <unordered_set> C++ <vector>


C++ sstream ostringstream Class

❮ sstream Library


Example

Build a string from text and numbers:

string name = "Adele";
int age = 45;

ostringstream output;
output << name << " is " << age << " years old";

cout << output.str();

Try it Yourself »


Share

Definition and Usage

An ostringstream is an output stream (a stream you write to) that keeps the result in a string. You write to it with <<, just like with cout.

Use str() to get the result as a string. This is useful when you want to build a string from text and numbers.

The ostringstream class is defined in the <sstream> header file.


Syntax

ostringstream name;

Parameter Values

None.

Technical Details

Returns: An ostringstream object. Write to it with <<, and use str() to get the result as a string.

Related Pages

Read more about strings in our Strings Tutorial.


❮ sstream Library

Free account

Track your progress

XP earned 0 Day streak 0 Spaces 0 League —

New

Learn in Adventure Mode W3Schools Adventure App

Coding fundamentals as bite-sized lessons and challenges.

×

Contact Sales

If you want to use W3Schools services as an educational institution, team or enterprise, send us an e-mail:
sales@w3schools.com

Report Error

If you want to report an error, or if you want to make a suggestion, send us an e-mail:
help@w3schools.com

W3Schools is optimized for learning and training. Examples might be simplified to improve reading and learning. Tutorials, references, and examples are constantly reviewed to avoid errors, but we cannot warrant full correctness of all content. While using W3Schools, you agree to have read and accepted our terms of use, cookies and privacy policy.

Copyright 1999-2026 by Refsnes Data. All Rights Reserved. W3Schools is Powered by W3.CSS.