Question

How to use static cast in C++

Answer 1

#include <iostream>

using std::cout;
using std::endl;

int main()
{
	int n = 4;
	double result = static_cast<double>(4) / 10;

	cout << result << endl;

	return (0);
}


/*
run:

0.4

*/

 

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Answer 2

#include <iostream>

using std::cout;
using std::endl;

int main()
{
	int n = static_cast<int>(3.14);
	
	cout << n << endl;

	return (0);
}


/*
run:

3

*/

 

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Answer 3

#include <iostream>

using std::cout;
using std::endl;

struct A {
	void f() const {
		std::cout << "struct A" << endl;
	}
};
struct B : A {
	void f() const {
		std::cout << "struct B" << endl;
	}
};

int main()
{
	B b1;
	A& a = b1;
	a.f();

	B& b2 = static_cast<B&>(a); 
	b2.f();

	return (0);
}


/*
run:

struct A
struct B

*/

 

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