Pointers & References

Question

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Hello everyone.
why in below program, output is 2.5?

float x = 2.5;
float &ref = x;
float *p1;
p1 = &ref + 2;
++(*p1);
cout << ref;

Posted 2-Jan-16 8:22am

Pouria Polouk

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Sergey Alexandrovich Kryukov 2-Jan-16 15:09pm

I'm just curious: what would you expect? :-)
—SA

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Sergey Alexandrovich Kryukov · Accepted Answer · 2016-01-02T09:08:00

This is because you never modified the value referenced by ref, so, at the end, you see the value you assigned by the moment when you initialized ref.

You probably have been confused by your manipulations with p1. Yes, if it was initialized with p1 = &ref, you would have ref == 3.5; but, by some weird reason, you added 2 to the pointer, that is, pointed the memory area behind x (which is, by the way, is quite unsafe).

SA