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The Implicit Converting Constructor

#include <iostream>
using namespace std;
class Element {
int atomic_number;
Element(int an_atomic_number) :
atomic_number(an_atomic_number) {}
int get_atomic_number() const {
return atomic_number;
// calling this function with an int parameter causes
// the converting constructor to be called
void print_element(Element x) {
cout << x.get_atomic_number() << endl;
int main() {
print_element(12); // prints 12
return 0;
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