What for num++ in this code?

Question

#include <iostream>
using namespace std

int main()
{
int num = 1;
int number;
int total = 0;

while (num <= 5) {
cin >> number;
total += number;
num++;
}
cout << total << endl;

return 0;
}

Answer 1

num must be 6 in the end

Answer 2

Num++ adds the value of num by 1 in every loop until the loop is terminated (when num becomes 6). It basically means: num=num+1.