Q:
What is the difference between delete and free in c++?
belongs to collection: C++ Interview Questions and Answers(2022)
C++ Interview Questions and Answers(2022)
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- What are C++ access modifiers?
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- What is “this” pointer in c++?
- Where we should use this pointer in C++?
- What is a “new” keyword in C++?
- What is the difference between new and malloc in c++?
- What is the difference between delete and free in c++?
- What do you mean by call by value and call by reference in c++?
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- Explain some ways of doing function overloading in C++?
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- What is the difference between function overloading and Operator Overloading?
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- Can you overload a function based only on whether a parameter is a value or a reference in c++?
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- Write a C++ program that describes function Overriding?
- What is the difference between function overloading and Overriding in c++?
- How to create and use a reference variable in C++?
- What is the difference between a pointer and a reference in c++?
- What is the virtual function?
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- Figure out functions that cannot be overloaded in C++?
C++ programming
Answer:
irst, let see what is the ‘delete’ and ‘free’ in C++, then we will see the difference between them.
Delete:
Delete is an Operator in C++ which is used to free the memory allocated by the ‘new’ operator. It is also called the destructor of the class.
The following is the general syntax of delete expression.
1. Destroys one non-array object created by a new-expression.
2. Destroys an array created by a new[]-expression
Free():
A free function is used to deallocate memory allocated by the malloc() or calloc() function.
The general syntax to use free:
free(ptr);
Some differences between delete and free:
- ‘delete’ is an operator while ‘free’ is a function.
- ‘delete’ frees the allocated memory which allocates by new and free frees the memory allocated by malloc, calloc, realloc.
- ‘delete’ calls the destructor while free does not call any destructor.
- free() uses C run time heap whereas delete may be overloaded on a class basis to use private heap.
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