What can be passed by non-type template parameters during compile time

1.	What can be passed by non-type template parameters during compile time?
A.	constant expression
B.	float
C.	int
D.	All of above
E.	None of these
Answer» D. All of above

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What is the output of this program? <pre class="prettyprint lang-c">#include <iostream> using namespace std; template <class T> inline T square(T n1) { T Output; Output = n1 * n1; return Output; }; template <> string square<string>(string Str) { return (Str + Str); }; int main() { int k = 4, kk; string bb("B"); kk = square<int>(k); cout << k << ": " << kk; cout << square<string>(bb) << ":" << endl; } </pre>
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What can be passed by non-type template parameters during compile time?

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