to_string() only working for small numbers

[Scuffz]

trying to input a credit card then convert it to a string so I can work with each individual number, now when i do a number like 323213 it works, but if I do a number with 16 digits it gives me back "-858993460" which is junk

  // Variables for Member function use.
	long creditcard;
	cout << "This machine accepts credit card only." << endl;
	cout << "Available items: " << endl;
	//display items from text file
	cout << "Enter your credit card number: ";
	cin >> creditcard;


	string CreditString = to_string(creditcard);
	cout << "Credit card as string " << CreditString << endl;

[integralfx]

Depending on the implementation long can have a range of [–2,147,483,648, 2,147,483,647] OR [–9,223,372,036,854,775,808 to 9,223,372,036,854,775,807].
https://en.wikipedia.org/wiki/64-bit_computing#64-bit_data_models

[liuyang]

I don't get it, why don't you just change
long creditcard
to
std::string creditcard

[boost lexical cast]

liuyang wrote:

I don't get it, why don't you just change
long creditcard
to
std::string creditcard

The OP could possibly be testing out the std::string::to_string() function.

[Peter87]

You could use long long.

long long creditcard;

[gunnerfunner]

This blog tests 16 (yes, SIXTEEN) different ways to convert int to string, most with external libraries though. However what's interesting is that conversion via stringstream was faster than std::to_string though not as fast as sprintf + std::string, at least for int's:

http://zverovich.net/2013/09/07/integer-to-string-conversion-in-cplusplus.html