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#include <iostream>
using namespace std;
 
class cb{
	private:
	int v1;
	int v2;
 
	public:
 
 
	cb(int n1,int n2){
 
		v1=n1;
		v2=n2;
 
 
	}
 
	void fs(){
 
		cout<<v1<<" ";
		cout<<v2<<"\n";
 
 
 
	}
 
 
 
 
};
 
 
class cd : cb{
 
	private:
	int v3;
 
	public:
	cd(int n3){
 
		v3=n3;
 
	}
 
	void fscd(){
 
		cout<<v3<<"\n";
 
	}
 
 
 
};
 
 
 
 
int main() {
 
 
	cb oggcb(100,200);
 
	oggcb.fs();
 
 
	cd oggcd(300);
 
	oggcd.fscd();
 
	oggcb.fs();
 
 
	return 0;
}

prog.cpp: In constructor ‘cd::cd(int)’:
prog.cpp:41:12: error: no matching function for call to ‘cb::cb()’
  cd(int n3){
            ^
prog.cpp:12:2: note: candidate: ‘cb::cb(int, int)’
  cb(int n1,int n2){
  ^~
prog.cpp:12:2: note:   candidate expects 2 arguments, 0 provided
prog.cpp:4:7: note: candidate: ‘constexpr cb::cb(const cb&)’
 class cb{
       ^~
prog.cpp:4:7: note:   candidate expects 1 argument, 0 provided
prog.cpp:4:7: note: candidate: ‘constexpr cb::cb(cb&&)’
prog.cpp:4:7: note:   candidate expects 1 argument, 0 provided

Standard output is empty