# Quiz 2 sample

Study the following code. It should meet the following specification, but it does not. Your task is to rewrite the code so that it is correct.

The function `is_prime` determines whether its input is a prime number. Recall that a prime number is defined as those integers (greater than 1) that are divisible by only themselves and 1 (of course 1 divides every integer). So 7 is prime because the only numbers that divide 7 are 7 itself and 1. But 9 is not prime because 9 is divisible by 3.

Here is a program that has the `is_prime` function and a `main` function. There are several errors in both functions. Rewrite the code so it is correct.

``````include <iostream>
using namespace std;

int main()
{
char c = 'Y';
while(c == 'Y');
{
cout << Enter a number: << endl;
cin >> n;

bool p = is_prime(n)
if(p)
{
cout << n << " is not prime." << endl;
}
else
{
cout << n << " is prime." << endl;
}

cout << "Do it again? Enter Y or N:"
cin >> c;
}
return 0;
}

void is_prime()
{
int n;
for(int i = 1; i < n; i++)
{
if(i % n == 0)
{
prime = false;
}
else
{
prime = true;
}
}
return prime;
}
``````