浅谈C++为什么非要引入那几种类型转换

#include <iostream> 
using namespace std; 
struct Base { 
  virtual void Func() { cout << "Base Func \n"; } 
}; 
struct Derive : public Base { 
  void Func() override { cout << "Derive Func \n"; } 
}; 
int main() { 
  float f = 1.23; 
  cout << "f " << f << endl; 
  int i = static_cast<int>(f); 
  cout << "i " << i << endl;  
  int *pi = static_cast<int *>(&f); // error invalid static_cast from type ‘float*' to type ‘int*' 
  Derive d; 
  d.Func(); 
  Base *b = static_cast<Base *>(&d); 
  b->Func(); 
  return 0; 
} 

#include <iostream> 
using namespace std; 
struct Base { 
  virtual void Func() { cout << "Base Func \n"; } 
}; 
struct Derive : public Base { 
  void Func() override { cout << "Derive Func \n"; } 
}; 
int main() { 
  Derive d; 
  d.Func(); 
   Base *b = dynamic_cast<Base *>(&d); 
  b->Func(); 
   Derive *dd = dynamic_cast<Derive *>(b); 
  dd->Func(); 
  return 0; 
} 

int main() { 
  int data = 10; 
  const int *cpi = &data; 
  int *pi = const_cast<int *>(cpi); 
  const int *cpii = const_cast<const int *>(pi); 
  return 0; 
} 

int main() { 
  int data = 10; 
  int *pi = &data; 
  float *fpi = reinterpret_cast<float *>(pi); 
  return 0; 
}