What is the output of this program?

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#include
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#include
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using namespace std;
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class Complex
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{
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private:
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double real;
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double imag;
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public:
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Complex(double r = 0.0, double i = 0.0) : real(r), imag(i)
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{}
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double mag()
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{
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return getMag();
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}
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operator double ()
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{
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return getMag();
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}
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private:
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double getMag()
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{
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return sqrt(real * real + imag * imag);
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}
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};
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int main()
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{
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Complex com(3.0, 4.0);
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cout