#include <iostream>
#include <string>
using namespace std;
int main ()
{
string pi = "pi is at least " + to_string(3.14159260000);
cout<< "pi = "<< pi << endl;
cout<<"to_string is available since "+ to_string(2011) << " so use it!";
return 0;
}
I2luY2x1ZGUgPGlvc3RyZWFtPiAgIAojaW5jbHVkZSA8c3RyaW5nPiAgCgp1c2luZyBuYW1lc3BhY2Ugc3RkOwppbnQgbWFpbiAoKQp7CglzdHJpbmcgcGkgPSAicGkgaXMgYXQgbGVhc3QgIiArIHRvX3N0cmluZygzLjE0MTU5MjYwMDAwKTsKICAJY291dDw8ICJwaSA9ICI8PCBwaSA8PCBlbmRsOwogIAkKICAJY291dDw8InRvX3N0cmluZyBpcyBhdmFpbGFibGUgc2luY2UgIisgdG9fc3RyaW5nKDIwMTEpIDw8ICIgc28gdXNlIGl0ISI7CiAgCiAgcmV0dXJuIDA7Cn0=