Thread: Beginner question: Restricting negative-numbers input into unsigned types?

code:

#include <iostream> int main() {    unsigned long n;    cout << "enter positive number: ";    while (!(cin >> n))    {       cin.clear();       while (cin.get() != '\n')          continue;       cout << "try again: ";    }    return 0; }

so, here have defense against bad input, how set limit on entering negative numbers? long user enters number below 0, goes past reset point unsigned long type, subtracts number 4294967296 (depending on implementation), , assigns n.

look cin.fail(). checks whether input user fits variable.

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