Define constant pointer and pointer to constant with a suitable example. write a program to demonstrate conversion from one class to another class type without using constructor.
In C++, a pointer is a variable that stores the memory address of another variable. There are two types of pointer declarations: constant pointer and pointer to constant. A constant pointer is a pointer whose value (i.e., the memory address it points to) cannot be changed. However, the value stored at the memory address can be modified. This is done by declaring the pointer variable as constant using the const keyword. int x = 10; int y = 20; int *const ptr = &x; // constant pointer to an integer variable *ptr = 30; // valid: modifies x to be 30 ptr = &y; // invalid: pointer value cannot be changed In this example, ptr is declared as a constant pointer to an integer variable. It is initialized with the memory address of x. The value stored at that memory address can be modified using the dereference operator *. However, the value of ptr cannot be changed as it is a constant pointer. A pointer to constant is a pointer whose value can be changed, but the value stored at the ...