c++ - Return integer value as string for date formatting -

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• how convert number string , vice versa in c++ 3 answers

i have function has 3 integer values, representing year, month , day. want return these values dashes '-' in between, in common date format.

e.g.:

int main() {     cout << myfunction() << endl; // should display 2014-04-15 }  string myfunction() {     int year = 2014;     int month = 04;     int day = 15;     // want return value     return year-month-day;//2014-04-15 } 

can me?

in c++03 can use std::ostringstream class format string using operator<< :

#include <string> #include <sstream> #include <iomanip>  std::string myfunction() {     int year=2014;     int month=04;     int day=15;      std::ostringstream oss;     oss << year << "-" << std::setw(2) << std::setfill('0')                                                       << month << "-" << day;     return oss.str();            ^^^^^^^^^ // yield formatted string oss contains } 

in c++11 can use std::to_string , operator+ concatenate strings:

#include <string>  std::string myfunction() {     int year=2014;     int month=04;     int day=15;      std::string s = to_string( year)                      + "-" + to_string(month)                     + "-" + to_string(day);     return s; } 

however to_string doesn't offer formatting option. if want specify format, again, should string stream.