What is the real difference between u suffix and unsigned modifier?

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Here I tried using both of them:

unsigned short foo1 = 65535;
short foo2 = 65535u;
cout << foo1 << endl << foo2 << endl;

And the output was:

65535
-1

What is the u suffix really used for? And for example if I replace 65535 with 65534 I'd get -2 as an output instead of -1. Meanwhile unsigned does what it's supposed to do.



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