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#ifndef _TEST_H#define _TEST_H#include 
   
    using namespace std;char* func(){	char *ch = "hello world";  //can do like this because this is a static data member,it stored in a static data area,will not be released after the func 	//char ch[] = "hello world";   //can not do like this because ch[] is on stack, it will be released when the func finish	return ch;}//it not safe because c is a local variable, it will be released when the func1 finish and will be used by others without any protection//but the return value record the adress of cint& func1(){	int a = 1;	int b = 2;	int c;	c = a+b;	cout << &c << endl;	cout << c << endl;	return c;}int main(){	int& result = func1();	cout << &result << endl;	cout << result << endl;	int &r = result;	cout << &r << endl;	cout << r << endl;	//test the data type of a string when it represent in different ways	/*char *result;	result = func();	cout << result << endl;	return 0;*/}#endif //_TEST_H
   

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