C + + memory allocation (new and delete)

In C, malloc and free are functions that are included in the Stdlib.h header file, and the assignment succeeds in returning the pointer, failing to return a null pointer.

The difference from new is:

1,malloc and free are standard library functions for c++/c languages, and new/delete are operators of C + +. They can all be used to request dynamic memory and free memory.

3, so the C + + language requires an operator new that can perform dynamic memory allocation and initialization, with an operator delete that can perform cleanup and release of memory work. Note New/delete is not a library function.
4,c++ programs often call C functions, whereas C programs can only use Malloc/free to manage dynamic memory.

(Excerpt from http://zhidao.baidu.com/link?url=IrwYsOm_ykBlbfF3DCsfeKwNj2bfwahMKa501_ Hs7cgrrnk5daeu11devgzhpwv9nsflmwlx6bp14bjunb-exa)

The code uses the following:

1#include <iostream>2#include <fstream>3#include <stdlib.h>4 #defineMaxnum 2005 intIsood (intn);6 7 using namespacestd;8 9 Ten intMainvoid) One { A     intN; -cout<<"Input N:"; -Cin>>N; the      -     int*p; -P= (int*)malloc(nsizeof(int)); -      for(intI=0; i<n;i++) +     { -p[i]=i; +     } A      for(intI=0; i<n;i++) at     { -cout<<p[i]<<" "; -     } -      -      Free(p); -}

#include <iostream> #include <fstream> #include <stdlib.h> #define MAXNUM 200int isood (int n); using namespace Std;int main (void) {int *p=new int;int a=3;p=&a;cout<<*p<<endl;delete p;//cout<<*p; int *q=new int [3];q[0]=0;q[1]=1;* (q+2) =3;cout<<q[0]<<endl;cout<<* (q+2);d elete [] q;}

　　

C + + memory allocation (new and delete)