Sum of Variables in C++ programming

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To find sum of two variables:

#include < iostream >
using namespace std;
int main()
{
int a ;
int b ;
int sum = 0 ;
a = 2 ;
b = 3 ;
sum = a + b ;
cout << sum << endl ;
return 0;
}

In the following program we declares two variables a and b and give there values as 2
and 3 respectively.
We also declare a variable 'sum' that is equals to 0 to avoid the
garbage value
And then we add both variables that is equals to sum.
Now the compiler will give 5 as output.
First the values of both a and b i.e.; 2 and 3 will add and then it will stores in
the variable sum. And as we our displaying sum so whatever the value is store will be dislay as output

Garbage Value:
Whenever we declare a variable a garble value is already stored in it. And when we assigns our own
value to that variable it will replace.
The garbage value will then destroy.