hex/oktal/dezimal-rechner

#include <iostream>
#include <iomanip>
#include <cmath>
#include <windows.h>
#include <conio.h>
#include <string>
using namespace std;

void g(){ getchar(); };
void sign5();
void string5();

int main() {
	system("color a");
	HANDLE hCon = GetStdHandle(STD_OUTPUT_HANDLE);

	COORD scb = { 140, 70 };
	SetConsoleScreenBufferSize(hCon, scb);


	SMALL_RECT rect = { 0, 0, 139, 69 };
	SetConsoleWindowInfo(hCon, TRUE, &rect);
	int Leer = ' ';
	int abcdefg;

	cin >> abcdefg;
	if (abcdefg == 13023012)
	{

		sign5();

		cout << "\nHex-dez-oktal-rechner\n\n";

		sign5();
		cout << "\n\ndas leerzeichen hat den zeichencode:	"
			<< Leer << endl << endl;
		g();

		for (;;)
		{
			char ch;
			string prompt =
				"\nGeben sie ein zeichen ein:	\n";

			cout << prompt;

			cin >> ch;
			Leer = ch;

			cout << " das zeichen " << ch
				<< "	hat den zeichencode" << endl;

			g();

			cout << uppercase
				<< oct << setw(8) << Leer << "	oktal\n"
				<< dec << setw(8) << Leer << "	dezimal\n"
				<< hex << setw(8) << Leer << "	hexadezimal\n" << endl;

			g();

		}
	}
	else if (abcdefg < 13023012)
	{
		cout << "falsche eingabe" << endl;
	}

	else

		cout << "falsche eingabe" << endl;

	getchar();
	return 0;
	
}

void sign5(){
	
	string stern(50, '*');
	std::cout <<  stern << endl;
}