How do I add the numbers between two numbers? For example 4 and 8 add me to 5,6,7 and show the result that is 18

Question

I am making an algorithm that if I enter 3 and 6 shows me the numbers that are in the middle of them two, which in this case are 4 and 5, and I want to add the values 4 and 5, how do I add them up?

#include <iostream>
using namespace std;
int main() {

int a, b,k;

printf("insert num: ");
cin >> a;
printf("insert num: ");
cin >> b;

cout << "son: ";
for( k = a+1; k < b ; k++){
cout << k << " ";

int sum = ?; //
cout<< "\n\n" << sum;
}
}

Answer 1

sum += k; in your for loop

Answer 2

replace your for loop with this ternary value initialize

(a<b? a:b) return minimum of a and b
(a>b? a:b) return maximum of a and b

for( k=((a<b? a:b) +1) ; k < (a>b? a:b); k++)

Answer 3

I have another problem, if I put 4 and 8, it prints 5,6,7 but if I put 8 and 4, it doesn't print anything ... how do I correct that?