C++ New And Delete Interview Question:

What is new operator and delete operator?

Submitted by: Administrator

new and delete operators are provided by C++ for runtime memory management. They are used for dynamic allocation and freeing of memory while a program is running.

The new operator allocates memory and returns a pointer to the start of it. The delete operator frees memory previously allocated using new. The general form of using them is:

p_var = new type;
delete p_var;
new allocates memory on the heap. If there is insufficient memory, then new will fail and a bad_alloc exception will be generated. The program should handle this exception.

Consider following program:
#include <iostream>
#include <new>
using namespace std;
int main()
{
int *p;
try
{
p = new int; //dynamic allocation of memory
}
catch (bad_alloc x)
{
cout << “Memory allocation failed”;
return 1;
}
*p = 100;
cout <<”P has value”<<*p;
delete p; //free the dynamically allocated memory
return 0;
}
Submitted by: Administrator