What is the output of this program?

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#include
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using namespace std;
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class sample
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{
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public:
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int x, y;
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sample() {};
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sample(int, int);
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sample operator + (sample);
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};
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sample::sample (int a, int b)
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{
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x = a;
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y = b;
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}
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sample sample::operator+ (sample param)
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{
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sample temp;
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temp.x = x + param.x;
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temp.y = y + param.y;
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return (temp);
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}
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int main ()
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{
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sample a (4,1);
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sample b (3,2);
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sample c;
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c = a + b;
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cout