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Int8 to Roman Numbers (string) function.

 
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Int8 to Roman Numbers (string) function.
PostPosted: Wed Oct 11, 2006 7:27 am     Reply with quote

First: declarations and function:

Code:

#include <string.h>
...
const int8 Numeros[] = {  1,    4,   5,    9,  10,   40,  50,   90, 100,  400, 500,  900, 1000};
...
//-----------------------------------------------------------------------------

void dec_to_roman(int8 LI, char* ptr){

   int i;
   char tmp[12];
   char* ptmp = (char*) tmp;
   strcpy(ptr,"");
   // transformo  de la tabla Arábiga a la Románica Latinitatis
   // {  1,    4,   5,    9,  10,   40,  50,   90, 100,  400, 500,  900, 1000};
   // { 'I', 'IV', 'V', 'IX', 'X', 'XL', 'L', 'XC', 'C', 'CD', 'D', 'CM', 'M'};
   for(i=12;i!=255;i--){
      while(LI >= Numeros[i]){
         LI = LI - Numeros[i];
         Switch(i){
            case 0:
               strcpy(ptmp,"I\0");
               break;
            case 1:
               strcpy(ptmp,"IV\0");
               break;
            case 2:
               strcpy(ptmp,"V\0");
               break;
            case 3:
               strcpy(ptmp,"IX\0");
               break;
            case 4:
               strcpy(ptmp,"X\0");
               break;
            case 5:
               strcpy(ptmp,"XL\0");
               break;
            case 6:
               strcpy(ptmp,"L\0");
               break;
            case 7:
               strcpy(ptmp,"XC\0");
               break;
            case 8:
               strcpy(ptmp,"C\0");
               break;
            case 9:
               strcpy(ptmp,"CD\0");
               break;
            case 10:
               strcpy(ptmp,"D\0");
               break;
            case 11:
               strcpy(ptmp,"CM\0");
               break;
            case 12:
               strcpy(ptmp,"M\0");
               break;
         }
         ptr=strcat(ptr,ptmp);
      }
   }
}
//-----------------------------------------------------------------------------


Second, a use example:

Code:

int8  H=128;
char H_in_RomanusNumericum[12];
...
dec_to_roman(H, (char*) H_in_RomanusNumericum);
printf("%s",H_in_RomanusNumericum);
...


Now H_in_RomanusNumericum is equal to "CXXVIII\0"

A curiosous example: The Pic Roman Clock


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