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all right guys i got it, thank you very much for your time and a special thanks to Salem, i'll follow the RULES from now on :-)

so why the next code compiling?

#include<iostream>
using namespace std;
int main()
{
int*ptr=new int[0];
*ptr=976;
cout<<*ptr<<endl;
system("pause");

thanks for the answer Sebastiani, but i don't think you right because the output of the next code:

#include<iostream>
using namespace std;
int main()
{
int*ptr=new int[0];
cout<<ptr<<endl;...

hi everyone:
what the meaning of
int*ptr=new int[0];?
it's compiling, and there isn't a run time error,
so what's the different between that and new int[1] or new int?
thanks alot