[HaBo]

#include <iostream>

using namespace std;

const int roemi[] = {5000, 4000, 1000, 900, 500, 400, 100, 90, 50, 40, 10, 9, 5, 4, 1};
const char roemc[][3]={"A", "MA", "M", "CM", "D", "CD", "C", "XC", "L", "XL", "X", "IX", "V", "IV", "I"};
const int arraynum = 15;
const int maxnum = 8888;

int main(int argc, char *argv[])
{
	int tmp;
	cout << "arabisch => roemisch" << endl;
	cout << "unter Anwendung der \"Subtraktionsregel\" (1..." << maxnum << ")" << endl;
	for(;;) {
		cout << "Zahl: " << flush;
		cin >> tmp;
		if(!tmp)
			break;
		if(tmp < 1 || tmp > maxnum)
			cout << "Ungueltige Zahl" << endl;
		else {
			cout << "roemisch: ";
			for(int i = 0 ; i < arraynum ; i++) {
				while(tmp >= roemi[i]) {
					tmp -= roemi[i];
					cout << roemc[i];
				}
			}
			cout << endl;
		}
	}
	return(0);
}

#include <iostream>

using namespace std;

const char romc[] = ("M", "CM", "D", "CD", "C", "XC", "L", "XL", "X", "IX", "V", "IV", "I");
const int romi[] = {1000, 900, 500, 400, 100, 90, 50, 40, 10, 9, 5, 4, 1};
const int arraynum = 13;
const int maxnum = 4999;

int main(int argc, char *argv[])
{
	int tmp;
	cout << "Roman to Arabic Number Converter" << endl;
	cout << "using the substraction rule" << endl;
	for(;;) {
		cout << "Please enter a Roman Number:" << flush;
		cin >> tmp;
		if(!tmp)
			break;
		if(tmp < 1 || tmp > maxnum)
			cout << "Illegal input!" << endl;
			cout << "Please enter a number that lies between 1 and 4999." << endl;
		else {
			cout << "Arabic Number:";
			for(int i = 0 ; i < arraynum ; i++) {
				while(tmp >= romc[i]) {
					tmp -= romc[i];
					cout << romi[i];
				}
			}
			cout << endl;
		}
	}
	return(0);
}

------ Build started: Project: miniproject1, Configuration: Debug Win32 ------
Compiling...
mpr1.cpp
.\mpr1.cpp(5) : error C2440: 'initializing' : cannot convert from 'const char *' to 'const char []'
        There are no conversions to array types, although there are conversions to references or pointers to arrays
.\mpr1.cpp(23) : error C2181: illegal else without matching if
Build log was saved at "file://g:\My Projects\miniproject1\miniproject1\Debug\BuildLog.htm"
miniproject1 - 2 error(s), 0 warning(s)
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

#include <iostream>
#include <string>

using namespace std;

const string romc[] = {"M", "CM", "D", "CD", "C", "XC", "L", "XL", "X", "IX", "V", "IV", "I"};
const int romi[] = {1000, 900, 500, 400, 100, 90, 50, 40, 10, 9, 5, 4, 1};
const int arraynum = 13;
const int maxnum = 4999;

int main(int argc, char *argv[])
{
	int tmp;
	cout << "Roman to Arabic Number Converter" << endl;
	cout << "using the substraction rule" << endl;
	for(;;) {
		cout << "Please enter a Roman Number:" << flush;
		cin >> tmp;
		if(!tmp)
			break;
		if(tmp < 1 || tmp > maxnum){
			cout << "Illegal input!" << endl;
			cout << "Please enter a number that lies between 1 and 4999." << endl;
                        }
		else {
			cout << "Arabic Number:";
			for(int i = 0 ; i < arraynum ; i++) {
				while(tmp >= romc[i]) {
					tmp -= romc[i];
					cout << romi[i];
				}
			}
			cout << endl;
		}
	}
	return(0);
}

------ Build started: Project: miniproject1, Configuration: Debug Win32 ------
Compiling...
mpr1.cpp
.\mpr1.cpp(28) : error C2784: 'bool std::operator >=(const std::basic_string<_Elem,_Traits,_Alloc> &,const _Elem *)' : could not deduce template argument for 'const std::basic_string<_Elem,_Traits,_Alloc> &' from 'int'
        C:\Programme\Microsoft Visual Studio 8\VC\include\string(241) : see declaration of 'std::operator >='
.\mpr1.cpp(28) : error C2784: 'bool std::operator >=(const _Elem *,const std::basic_string<_Elem,_Traits,_Alloc> &)' : could not deduce template argument for 'const _Elem *' from 'int'
        C:\Programme\Microsoft Visual Studio 8\VC\include\string(231) : see declaration of 'std::operator >='
.\mpr1.cpp(28) : error C2784: 'bool std::operator >=(const std::basic_string<_Elem,_Traits,_Alloc> &,const std::basic_string<_Elem,_Traits,_Alloc> &)' : could not deduce template argument for 'const std::basic_string<_Elem,_Traits,_Alloc> &' from 'int'
        C:\Programme\Microsoft Visual Studio 8\VC\include\string(221) : see declaration of 'std::operator >='
.\mpr1.cpp(28) : error C2784: 'bool std::operator >=(const std::reverse_iterator<_RanIt> &,const std::reverse_iterator<_RanIt2> &)' : could not deduce template argument for 'const std::reverse_iterator<_RanIt> &' from 'int'
        C:\Programme\Microsoft Visual Studio 8\VC\include\xutility(1866) : see declaration of 'std::operator >='
.\mpr1.cpp(28) : error C2784: 'bool std::operator >=(const std::pair<_Ty1,_Ty2> &,const std::pair<_Ty1,_Ty2> &)' : could not deduce template argument for 'const std::pair<_Ty1,_Ty2> &' from 'int'
        C:\Programme\Microsoft Visual Studio 8\VC\include\utility(101) : see declaration of 'std::operator >='
.\mpr1.cpp(28) : error C2677: binary '>=' : no global operator found which takes type 'const std::string' (or there is no acceptable conversion)
.\mpr1.cpp(28) : fatal error C1903: unable to recover from previous error(s); stopping compilation
Build log was saved at "file://g:\My Projects\miniproject1\miniproject1\Debug\BuildLog.htm"
miniproject1 - 7 error(s), 0 warning(s)
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

#include <iostream>

using namespace std;

void main()

{        int a;
        float b;
        char c;
        cout<<"\nHier werden arabische Zahlen in roemische umgerechnet!";
        
        do                                                                                //Abbruch- oder Wiederholschleife
        {        cout<<"\n\nGib eine Zahl ein:";
                
                do                                                                        //Eingabeschleife
                {        cin>>b;                                                        //Falscheingabe
                        a=(int)b;
                        if (b>8000 || b<1)
                                cout<<"\n\nFalsche Eingabe\n\nGib eine Zahl ein:";
                        else
                        {        if(a!=b)
                                        cout<<"\n\nFalsche Eingabe\n\nGib eine Zahl ein:";
                        }
                }
                while(b>8000 || b<1 || a!=b);                //Roemische Ziffer
                
                cout<<"\nRoemische Zahl:";
                
                do
                {        while (b/1000>=1)
                        {        cout<<"M";
                                b=b-1000;
                        }        
                }
                while(b>1000);

                do
                {        while (b/500>=1)
                        {        cout<<"D";
                                b=b-500;
                        }
                }
                while(b>500);

                do
                {        while (b/100>=1)
                        {        cout<<"C";
                                b=b-100;
                        }
                }
                while(b>100);

                do
                {        while (b/50>=1)
                        {        cout<<"L";
                                b=b-50;
                        }
                }
                while(b>50);

                do
                {        while (b/10>=1)
                        {        cout<<"X";
                                b=b-10;
                        }
                }
                while(b>10);

                do
                {        while (b/5>=1)
                        {        cout<<"V";
                                b=b-5;
                        }
                }
                while(b>5);

                do
                {        while (b/1>=1)
                        {        cout<<"I";
                                b=b-1;
                        }
                }
                while(b>1);
        
                do
                {        cout<<"\n\nNeue Zahl berechnen ?  (j/n) ";
                        cin>>c;
                }
                while((c!='j') && (c!='n'));

        }
        while(c=='j');
}

#include <iostream>
#include <cstring>
using namespace std;

int main ()
{
	char roman_num[10];
	cout << "Enter a Roman Numeral: ";
	cin >> roman_num;
	int len = strlen(roman_num);
	int number = 0;
	int counter = 0;
	int b4sum = 0;
	int sum = 0;

	for (counter = len; counter >= 0; counter--)
	{
		if (roman_num[counter] == 'M')
			number = 1000;
		else if (roman_num[counter] == 'D')
			number = 500;
		else if (roman_num[counter] == 'C')
			number = 100;
		else if (roman_num[counter] == 'L')
			number = 50;
		else if (roman_num[counter] == 'X')
			number = 10;
		else if (roman_num[counter] == 'V')
			number = 5;
		else if (roman_num[counter] == 'I')
			number = 1;
		else
			number = 0;

		if (b4sum > number)
			sum = b4sum - number;
		else
			sum = sum + number;

		b4sum = number;
	}

	cout << "The Arabic Numeral is: " << sum << endl;

	return 0;
}