How do i revert a value created using bitwise operator '|'?

Question

For example,
int a = 3;
int b = 5;
int c = a | b;
so the value for c will be 7 as per bitwise operator rules. So how can one change value of c after removing value of b and as a result get value of a and visa versa

Answer 1

Impossible because different operands may result in the same value.
Can you determine x in the equation x * 0 = 0 ?

As you say, 3 | 5 is 7.
Likewise,
3 | 4, 3 | 6, and 3 | 7 is also 7.
So if 7 and 3 given, the other operand can be 4, 5, 6 or 7.
No way to determine which is the original.

You can list all possibilities instead, but I don't think it is what you want.