C language forced conversion and memory

 

Take a look at the following Fun class, including constructors and forced type conversion functions.

 

1. # include <iostream> 2. # include <cstdio> 3. # include "fun. h "4. using namespace std; 5. int main () 6. {7. fun f; 8. cout <f <endl; // output 5 9. printf ("% d \ n", f); // output 3 10. printf ("$ d \ n", (int) f); // output 5 11. return 0 ;}

It is not hard to see that the <call forcibly converts the second parameter to an int, but the % d of printf only reads the first 32 bits of the following parameters and parses them into an int. If you want to use printf and call the forced conversion method of the class, you need to explicitly convert the type of the object.