1. Use <iostream> header instead of <iostream.h> #include <iostream> 2. Add this line before class declaration: using namespace std; 3. The calc method is called with parameters of type (int, double) and compiler doesn't know what method to choose: (int, int) or (int, float). So the second parameter has to be either int or float. Since you need to pass the floating point value you should use the following method call: p.calc(20, 10.4f);
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Thanks 4 d solution!!!
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