Understanding C + + is not a type-safe language

See Script House: http://www.jb51.net/article/37847.htm

In C + +, you can think of 0 as the bool type of false, or as the number 0 in int. It means that C + + is not a type-safe language.

Similarly, CString in MFC is not a type-safe class. Because other types of data can be converted to CString by using the member function format in csting.

1#include <iostream>2 3 using namespacestd;4 5  BOOLFun ()//The function return type is bool, but we can return the int type in the function. 6  {7      return 1;8  }9 Ten  voidMain () One  { A      intA=1; -      if(a)//A is of type int, but can be used as a bool type.  -      { thecout<<"C + + is non-type safe. "<<Endl; -      } -       -}

Understanding C + + is not a type-safe language