[c-prog] Help with new char array

[CK]

I'm trying to define dynamic array using "new".
 
Char *str = "Hello World";
Char *newstr = new char[strlen(str)];
 
Cout<<strlen(str)<<endl;
Cout<<strlen(newstr)<<endl;
 
Strlen(str) = 11;
Strlen(newstr) = 3;
 
Why is it only 3? What is wrong? Can somebody help me with this? 
 
Thank you 
 
CK

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