#include <tchar.h>
#include <iostream.h>
#include <conio.h>
#include <windows.h>
#include <string.h>
#include <ctype.h>
#include <stdio.h>


#pragma argsused

int _tmain(int argc, _TCHAR* argv[]) {
	SetConsoleCP(1251);
	SetConsoleOutputCP(1251);
	cout << "Введите число в пятиричной системе:" << endl;
	char s5[20] = {'\0'}, s15[20] = {'\0'};
	int s10 = 0, dl, k, a;
	gets(s5);
	for (int i = 0; s5[i] != '\0'; i++) {
		switch (s5[i]) {
		case '0':
			k = 1;
			break;
		case '1':
			k = 1;
			break;
		case '2':
			k = 2;
			break;
		case '3':
			k = 3;
			break;
		case '4':
			k = 4;
			break;
		default:
			cout << "Error";
			getch();
			return 1;
		}

		s10 = s10 * 5 + k;
	}
	cout << "Ваше число в десятиричной системе:" << endl;
	cout << s10 << endl;
	for (int i = 0; s10 != 0; i++) {

		a = s10 % 15;

		switch (a) {
		case 1:
		case 2:
		case 3:
		case 4:
		case 5:
		case 6:
		case 7:
		case 8:
		case 9:
		case 0:
			s15[i] = char(a + 48);
			break;
		case 10:
			s15[i] = 'A';
			break;
		case 11:
			s15[i] = 'B';
			break;
		case 12:
			s15[i] = 'C';
			break;
		case 13:
			s15[i] = 'D';
			break;
		case 14:
			s15[i] = 'E';
			break;
		default:
			cout << "Error";
			return 1;
		}
		s10 /= 15;

	}

	dl = strlen(s15);
	cout << "Ваше число в пятнадцатиричной системе:" << endl;
	for (int i = dl - 1; i >= 0; i--) {
		cout << s15[i];
	}

	getch();
	return 0;
}