I have this C++ code for lottery, but it handles the situation wrong where the user inputs a negative value.

#include

using namespace std;

unsigned long int read_input(string question) {

unsigned long int user_input;

while (true) {

cout

cin >> user_input;

if (user_input > 0) {

return user_input;

} else {

cout

}

}

}

unsigned long int factorial(unsigned long int i) {

unsigned long int k = 1;

while (i > 0) {

k *= i;

i -= 1;

}

return k;

}

unsigned long int calculate_probability(unsigned long int n, unsigned long int p) {

if(p == 0) return 1;

return factorial(n) / (factorial(p) * factorial(n - p));

}

int main() {

unsigned long int balls_tot = read_input("Enter the total number of lottery balls: ");

unsigned long int ball_count = read_input("Enter the number of drawn balls: ");

if (ball_count > balls_tot) {

cout

} else {

cout

}

return 0;

}

It should work like this:

Model output: Enter the total number of lottery balls: 3 Enter the number of drawn balls: 4 The number of balls must be a positive number