Hey im totally new to this. Can someone please explain why the code given below does not properly work?

Question

#include <iostream>
Using namespace std;
Int main()
{
Int a;
Int b;
Int x = a + b;
Int sum = x + x;
Cout << "insert a number \n";
Cin >> a;
Cout << "Insert another number \n";
Cin >> b;
Cout << "the answer is : " << sum << endl;

Return 0;
}

Answer 1

You declare a and b, but you don't give an initial value; so a and b have random values (whatever was there in memory before you declared you want to use that spot).

x = a + b now sums up these two random values. What will be the result? Something random.

You decide that sum is to be x + x. So what is random + random? Do you begin to see a pattern? Yeah - random! 😉

Now you read user input into a and b. a and b store new values now, the former random values are gone.

sum though is still the result of (a+b) + (a+b)
equals
(x) + (x)
equals
random + random. Because you made it so earlier.

In short: The sum you output has no relation to what the user input.

To correct this:

First take the user input.

Then sum up the user input.

Then output the sum.

Answer 2

Int a and b must be initialized first..😂