I don't get how num helps us find the find sum of user inputted numbers. please explain this code. Although I did notice that without it the output is always 0 no matter which number is inputted.

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

While num is able to be increased because it is defined as 1 in the condition 1 <= 5 ( 1,2,3,4,5) if user inputs 2 it is doing total(0) + number(2) * 5 = total = 10
For 3 total(0) + number(3) * 5 = total = 15

If num is not defined it has no number to use in the condition num <= 5.

Answer 2

Each time the statement loops, num is increased by one until num is greater than 5(as stated in the condition: while num is less or equal to 5). Which means the statement will loop 5 times and will add 1 to num every loop (num++ means num + 1) until the condition is not True anymore which is when num is greater than 5.