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#include <stdio.h>
#include <stdlib.h>

void numeral(int num, char buffer[])
{
	int ones = num % 10;
	int tens = num / 10;
	int i = 0;

	switch (tens)
	{
		case 1:
			buffer[i++] = 'X';
			break;
		case 2:
			buffer[i++] = 'X';
			buffer[i++] = 'X';
			break;
		case 3:
			buffer[i++] = 'X';
			buffer[i++] = 'X';
			buffer[i++] = 'X';
			break;
		case 4:
			buffer[i++] = 'X';
			buffer[i++] = 'L';
			break;
		case 5:
			buffer[i++] = 'L';
			break;
	}

	switch (ones)
	{
		case 1:
			buffer[i++] = 'I';
			break;
		case 2:
			buffer[i++] = 'I';
			buffer[i++] = 'I';
			break;
		case 3:
			buffer[i++] = 'I';
			buffer[i++] = 'I';
			buffer[i++] = 'I';
			break;
		case 4:
			buffer[i++] = 'I';
			buffer[i++] = 'V';
			break;
		case 5:
			buffer[i++] = 'V';
			break;
		case 6:
			buffer[i++] = 'V';
			buffer[i++] = 'I';
			break;
		case 7:
			buffer[i++] = 'V';
			buffer[i++] = 'I';
			buffer[i++] = 'I';
			break;
		case 8:
			buffer[i++] = 'V';
			buffer[i++] = 'I';
			buffer[i++] = 'I';
			buffer[i++] = 'I';
			break;
		case 9:
			buffer[i++] = 'I';
			buffer[i++] = 'X';
			break;
	}

	buffer[i] = 0;
}

int main(int argc, char* argv[])
{
	char buffer[50];

	for (int i = 1; i <= 25; i++)
	{
		numeral(i, buffer);
		printf("%2d = %-10s  ", i, buffer);

		numeral(i + 25, buffer);
		printf("%2d = %-10s\n", i + 25, buffer);
	}
}



jreese@garrus /tmp/roman » g++ -o roman roman.cpp && ./roman
 1 = I           26 = XXVI      
 2 = II          27 = XXVII     
 3 = III         28 = XXVIII    
 4 = IV          29 = XXIX      
 5 = V           30 = XXX       
 6 = VI          31 = XXXI      
 7 = VII         32 = XXXII     
 8 = VIII        33 = XXXIII    
 9 = IX          34 = XXXIV     
10 = X           35 = XXXV      
11 = XI          36 = XXXVI     
12 = XII         37 = XXXVII    
13 = XIII        38 = XXXVIII   
14 = XIV         39 = XXXIX     
15 = XV          40 = XL        
16 = XVI         41 = XLI       
17 = XVII        42 = XLII      
18 = XVIII       43 = XLIII     
19 = XIX         44 = XLIV      
20 = XX          45 = XLV       
21 = XXI         46 = XLVI      
22 = XXII        47 = XLVII     
23 = XXIII       48 = XLVIII    
24 = XXIV        49 = XLIX      
25 = XXV         50 = L