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	fromRoman (const char *str)
SWORD_NAMESPACE_START char	isRoman (const char *str, int maxchars)

Function Documentation

int fromRoman

(

const char *

s

)

Converts a roman numeral to a value.

Parameters

s	Roman numeral to convert.

Definition at line 39 of file roman.cpp.

                               {
    int i, n = (int)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 *	s,
		int	maxchars = 0
	)

Checks if a string is a roman numeral.

Definition at line 31 of file roman.cpp.

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