This code is not working properly, could you please check it out. I have been trying to solve it

The sum of all integers between n1 and n2 inclusively

• Ask the user to enter two numbers, n1 and n2, using the int data type.
• Using any looping mechanism (determine which loop works best), calculate the sum of all numbers between n1 and n2

cout << "Enter a number:";

cin >> n1;

cout << "Enter a number:";

cin >> n2;

for(i = n1; i <= n2; i++)

{

sum += i;

}

cout << endl;

cout << "SUM: "<< sum << endl;

cout << endl;

break;