parameterized constructor in c++

programs of parameterized constructor :

#include<iostream>
using namespace std;
class abc{
	int a,b;
	public:
	abc(int a1){
		a=a1;
	}
	abc(int a1,int a2){
		a=a1;
		b=a2;
		cout<<"two parameter is called";
	}
	int get_a(){
		return a;
	}
	int get_b(){
		return b;
	}
};
int main(){
	abc st(10,20);
	cout<<st.get_a();
	cout<<st.get_b();
}

out put:

 two parameter is called
 10
 20

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