Question

How to use constructor with different parameter type in C++

Answer 1

#include <iostream>

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

class Test {
	int a;
public:
	Test(int _a) {
		a = _a;
	}
	Test(char *s) {
		a = atoi(s);
	}
	int val() {
		return a;
	}
};

int main()
{
	Test o1 = 13;
	Test o2 = "99";

	cout << o1.val() << endl;
	cout << o2.val() << endl;

	return 0;
}



/*
run:

13
99

*/

 

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Answer 2

#include <iostream>

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

class Test {
	int a;
public:
	Test(int _a) {
		a = _a;
	}
	Test(char *s) {
		a = atoi(s);
	}
	int val() {
		return a;
	}
};

int main()
{
	Test o1 = 13;
	Test o2 = "99";

	cout << o1.val() << endl;
	cout << o2.val() << endl;

	o1 = "88";        
	o2 = 15;     

	cout << o1.val() << endl;
	cout << o2.val() << endl;

	return 0;
}



/*
run:

13
99
88
15

*/

 

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