Answer Posted / bharathi

Constants:
constant is used for declaring variable as constant and this constant value cannot be modified once after declartration.

It is must to declare the constant value at the time of declaration only.
Example:
constant int y=5;

Readonly

Readonly variables can not be modified like constant,but it is after initialization.
So.it is not mandatory to initialize those variables at declaration time.they can also be initialize after declaration.

Example:
readonly int x;

add()
{
x=5;
}


Both after initilization, we can not modify those values again.

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