Dynamic memory allocation in c plus plus?

Answer 1

The following function demonstrates a dynamic array of integers. The array is dynamically allocated a random number of elements, from 1 to 100, with pointer p pointing at the start address (&p[0]). Note that the number of elements needn't be random, but unlike a static array which has a constant size and can therefore be allocated in the data segment by the compiler, the number of elements in a dynamic array is not known in advance and must therefore be allocated on the free store at runtime. The number of elements is variable.

#include <iostream>

#include <time.h>

int main()

{

srand(( unsigned ) time( NULL ));

int elements = rand() % 100 + 1;

int * p = new int[elements];

// do something with array...

// p[0] will return the first element

// p[elements-1] returns the last element.

delete [] p; // release memory.

p = NULL;

return( 0 );

}