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The following class declarations or programs contain errors. How many errors exist? #include using namespace std; class Dumbbell; { int weight; public: void setWeight(int); void

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The following class declarations or programs contain errors. How many errors exist? #include using namespace std; class Dumbbell; { int weight; public: void setWeight(int); void setWeight(int w) { weight = w; } int main() { Dumbbell bar; Dumbell(200); cout

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