Answer Posted / sumesh

For Both Constants and Read only values, we can set values
for them only once.

In the case of Constants, we set the value at the compile
time itself. After that we cannot change it

Example:

class Test
{
const double pi = 3.14;
.......................
.......................

}

In the case of Read only data, we can set the value in the
constructor.

Example:

class Test
{
private double _bonus;

public Test(double bonus)
{
_bonus = bonus;
}

public double Bonus
{
get { return _bonus; }
}

}

Test a(5.25);
Test b(6.75);

In this case, at the time object creation, we can set the
value for the bonus. That is, we can decide the value at
the runtime. So a reaonly variable is also known as runtime
constants.


So, the basic difference is, in the case of contstant, the
value will be same across the objects of that class, but it
may differ in the case of readonly variables.

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