src/utilfuns/roman.cpp File Reference

#include <stdlib.h>
#include <string.h>
#include <roman.h>

Include dependency graph for roman.cpp:

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Functions
int	from_rom (const char *str)
SWORD_NAMESPACE_START char	isroman (const char *str, int maxchars)

---

Function Documentation

int from_rom

(

const char *

s

)

Converts a roman numeral to a string.

Parameters:

s

Roman numeral to convert.

Definition at line 34 of file roman.cpp.

                              {
    int i, n = strlen(str);
    short * num= (short *) calloc(n, sizeof(short));
    for (i = 0; str[i]; i++) {
        switch(str[i]) {
        case 'i':
        case 'I':
            num[i] = 1;
            break;
        case 'v':
        case 'V':
            num[i] = 5;
            break;
        case 'x':
        case 'X':
            num[i] = 10;
            break;
        case 'l':
        case 'L':
            num[i] = 50;
            break;
        case 'c':
        case 'C':
            num[i] = 100;
            break;
        case 'd':
        case 'D':
            num[i] = 500;
            break;
        case 'm':
        case 'M':
            num[i] = 1000;
            break;
        default:
            num[i] = 0;
        }
    }
    for (i = 1; str[i]; i++) {
        if (num[i] > num[i-1])  {
            num[i] -= num[i-1];
            num[i-1] = 0;
        }
    }
    n = 0;
    for (i = 0; str[i]; i++) {
        n += num[i];
    }
     free(num);
    return n;
}

SWORD_NAMESPACE_START char isroman	(	const char *	,
		int	maxchars = 0
	)

Checks if a string is a roman numeral.

Definition at line 26 of file roman.cpp.

                                             {
    char *ch = (char*)str;
    for (; *ch && (!maxchars || (ch-str) <= maxchars); ch++)
        if (!strchr("IVXLCDMivxlcdm ", *ch))
            return 0;
    return 1;
}