Why this program loop infinitely? [C++]?

#include %26lt;iostream%26gt;


using namespace std;





int main()


{


int accNum, begin , charges, credits ,


limit;








cout%26lt;%26lt; "Enter account number: ";


cin%26gt;%26gt;accNum;


while (accNum !=-1)


{





cout%26lt;%26lt;"Beginning balance: ";


cin%26gt;%26gt;begin;


cout%26lt;%26lt;endl%26lt;%26lt;"Total charges: ";


cin%26gt;%26gt;charges;


cout%26lt;%26lt;endl%26lt;%26lt;"Total credits: ";


cin%26gt;%26gt;credits;


cout%26lt;%26lt;endl%26lt;%26lt;"Credit limit: ";


cin%26gt;%26gt;limit;


if (begin+charges-credits %26gt;limit){


cout%26lt;%26lt;"\t Calculating.."%26lt;%26lt;endl


%26lt;%26lt;"Account: "%26lt;%26lt;accNum;


cout%26lt;%26lt;"Credit limit: "%26lt;%26lt;limit


%26lt;%26lt;endl;


cout%26lt;%26lt;"Balace: "%26lt;%26lt;begin+charges-credits


%26lt;%26lt;endl;


cout%26lt;%26lt;"Exceeded !"%26lt;%26lt;endl;


}


cout%26lt;%26lt; "Enter account number: ";


cin%26gt;%26gt;accNum;


}


}

Why this program loop infinitely? [C++]?
There is nothing wrong with this program.


It only 'loops endlessly' when you input a non-number value.