C++ concatenate strings with stream or sprint

There are many different ways to achieve this, but in my opinion the best method for something this commonly used is a solution that does not require additional external dependencies.. However, see reference at the bottom of this post for some other good solutions which are optimized for speed and brevity.

//declare our variables to concatenate
std::string name="somename";
int age = 100;
std::string result;

//if it's for basic console output
std::cout << "name:" << name << " age:" << age;

//using stringstream
std::stringstream ss;
ss << "name:" << name << " age:" << age;
result = ss.str();
std::cout << result;

//using ostringstream
std::ostringstream os;
os << "name:" << name << " age:" << age;
std::cout << os.str();

//using strintf
char numstr[21]; // enough to hold all numbers up to 64-bits
sprintf(numstr, "%d", age); //convert age to string
result = name + numstr; //concatenate

Stackoverflow (forum), http://stackoverflow.com/questions/191757/c-concatenate-string-and-int


About Ronnie Diaz

Ronnie Diaz is a software engineer and tech consultant. Ronnie started his career in front-end and back-end development for companies in ecommerce, service industries and remote education. This work transitioned from traditional desktop client-server applications through early cloud development. Software included human resource management and service technician workflows, online retail e-commerce and electronic ordering and fulfillment, IVR customer relational systems, and video streaming remote learning SCORM web applications. Hands on server experience and software performance optimization led to creation of a startup business focused on collocated data center services and continued experience with video streaming hardware and software. This led to a career in Amazon Prime Video where Ronnie is currently employed, building software and systems which stream live sports and events for millions of viewers around the world.

Posted on June 3, 2011, in Programming & Development and tagged , , , , , , , . Bookmark the permalink. Leave a comment.

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