C++: 'cout << pointer << ++pointer' generates a compiler warning

Question

I have a C++ learning demo here:

char c = \'M\';
short s = 10;
long l = 1002;
char * cptr = &c;
short * sptr = &s;
long * lptr = &l;
cout <&         


        

Answer 1

You re having undefined behavior in lines 18, 19, 20. Cause of the result of executing the line will be different depending on whether ptr or ++ptr is evaluated first.