How can you set a value for an object declared with the const keyword?

In C/C++, the keyword const means that the value of an object cannot be changed after initialization. However, there are several ways to set the value for a const object:

1. Initialization at declaration:

const int x = 10; // Value is set immediately

2. Using a constructor for const class objects:

class MyClass {
    const int value;
public:
    MyClass(int v) : value(v) {} // Initialize const member via initializer list
};

const MyClass obj(5); // value is set through constructor

3. Using pointers or references to non-const data (not recommended, as it violates const-correctness):

const int x = 10;
int* p = (int*)&x; // Type casting
*p = 20; // Undefined behavior, may lead to errors

Thus, for a const object, the value must be set during initialization — it cannot be changed later. If you need to change the value, the object should not be const.