http://www.daniweb.com – Hello everyone... I have 2 questions and it would be great if you guys can help me on these. I wrote a factorial program and it works already. The problem is when it comes to higher outputs. For example: 11 P 5 = 55440 // this works so far but 13 P 5 = 154440 // but my output is 47917 Im using already long instead of integer. Can someone help me out on this? Second thing is, how do i avoid that someone will enter letters? :-) Btw my code is: #include <iostream> using namespace std; long factorial (long n) { if (n > 1) return (n * factorial (n-1)); else return (1); } int main () { cout<< " WELCOME TO THE 2 BASED FACTORIAL CALCULATOR " << endl << endl; start:; long number; cout << "Please type a number: "; cin >> number; long number2; cout << endl << "Please type a 2nd number: "; cin >> number2; long number3; number3 = factorial(number) / factorial(number - number2); { if (number < number2) { cout<< "Please let the first number be bigger than the second number." << endl << endl; goto start; } if (number >= number2) { cout << endl << number << " P " << number2 << " = " << number3 << endl << endl; } } goto start; return 0; } (General)
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