C/C++ Source Codes

allocation of memory and deallocation of memory during run-time

#include <iostream.h>
#include <string.h>
void main ()
{
double *d; // d is a variable whose purpose
// is to contain the address of a
// zone where a double is located
d = new double; // new allocates a zone of memory
// large enough to contain a double
// and returns its address.
// That address is stored in d.
*d = 45.3; // The number 45.3 is stored
// inside the memory zone
// whose address is given by d.
cout << "Type a number : ";
cin >> *d;
*d = *d + 5;
cout << "Result : " << *d << endl;
delete (d); // delete deallocates the
// zone of memory whose address
// is given by pointer d.
// Now we can no more use that zone.
d = new double[15]; // allocates a zone for an array
// of 15 doubles
d[0] = 4456;
d[1] = d[0] +567;
cout << "Content of d[1] : " << d[1] << endl;
delete (d);
int n = 30;
d = new double[n]; // new can be used to allocate an
// array of random size.
for (int i = 0; i < n; i++)
{
d[i] = i;
}
delete (d);
char *s;
s = new char[100];
strcpy (s, "Hello !");
cout << s << endl;
delete (s);
}

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