What is difference between static_cast and dynamic_cast?

static_cast − This is used for the normal/ordinary type conversion. dynamic_cast −This cast is used for handling polymorphism. You only need to use it when you’re casting to a derived class. This is exclusively to be used in inheritence when you cast from base class to derived class.

What is the purpose of Reinterpret_cast and how does it differ from a regular cast?

reinterpret_cast is a type of casting operator used in C++. It is used to convert a pointer of some data type into a pointer of another data type, even if the the data types before and after conversion are different.

What does static_cast mean in C++?

The static_cast operator converts variable j to type float . This allows the compiler to generate a division with an answer of type float . All static_cast operators resolve at compile time and do not remove any const or volatile modifiers.

What is the commonly used casting function for casting the pointer to different objects of the classes in an inheritance hierarchy?

static_cast. static_cast can be used to convert between pointers to related classes (up or down the inheritance hierarchy). It can also perform implicit conversions. When we’re casting up the hierarchy, static_cast is not needed.

What is dynamic_cast in C++ with example?

The dynamic_cast operator ensures that if you convert a pointer to class A to a pointer to class B , the object of type A pointed to by the former belongs to an object of type B or a class derived from B as a base class subobject. You may perform downcasts with the dynamic_cast operator only on polymorphic classes.

What happens when dynamic_cast fails?

If a dynamic_cast fails, the result of the conversion will be a null pointer. Because we haven’t checked for a null pointer result, we access d->getName(), which will try to dereference a null pointer, leading to undefined behavior (probably a crash).

What is the point of Reinterpret_cast?

The reinterpret_cast allows the pointer to be treated as an integral type. The result is then bit-shifted and XORed with itself to produce a unique index (unique to a high degree of probability). The index is then truncated by a standard C-style cast to the return type of the function.

When should you use Reinterpret_cast?

reinterpret_cast is used when you want to convert one type to another fundamentally different type without changing the bits.

What is Dynamic_cast in C++ with example?

What happens when you perform a static_cast?

The static_cast operator converts a null pointer value to the null pointer value of the destination type. Any expression can be explicitly converted to type void by the static_cast operator. The destination void type can optionally include the const , volatile , or __unaligned attribute.

What is the use of static_cast?

The static_cast operator can be used for operations such as converting a pointer to a base class to a pointer to a derived class. Such conversions are not always safe.

Why do we need casting?

Type casting is a way of converting data from one data type to another data type. This process of data conversion is also known as type conversion or type coercion. In Java, we can cast both reference and primitive data types. By using casting, data can not be changed but only the data type is changed.