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/***
This file is part of Simple numbers converter.
Copyright (C) 2021 Aleksandr D. Goncharov (Joursoir) <chat@joursoir.net>
Simple numbers converter is free software; you can redistribute it
and/or modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
Simple numbers converter is distributed in the hope that it will be
useful, but WITHOUT ANY WARRANTY; without even the implied warranty
of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, see <http://www.gnu.org/licenses/>.
***/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "snc.h"
int getRomanValue(char symbol)
{
switch(symbol) {
case 'I': return SNC_ROMAN_I; // have triple notation
case 'V': return SNC_ROMAN_V;
case 'X': return SNC_ROMAN_X; // have triple notation
case 'L': return SNC_ROMAN_L;
case 'C': return SNC_ROMAN_C; // have triple notation
case 'D': return SNC_ROMAN_D;
case 'M': return SNC_ROMAN_M; // have triple notation
}
return 0;
}
int romanToArabic(char *str)
{
int answer = 0;
int last_value = 0;
int amount_char = 0;
while(*str)
{
int cur_value = getRomanValue(*str);
if(cur_value == 0)
return -1;
else if(last_value == cur_value || last_value == 0) {
answer += cur_value;
amount_char++;
}
else if(last_value > cur_value) {
answer += cur_value;
amount_char = 1;
}
else if(last_value < cur_value) {
if(last_value * 10 < cur_value)
return -1;
else if(last_value == SNC_ROMAN_V ||
last_value == SNC_ROMAN_L || last_value == SNC_ROMAN_D)
return -1;
answer += cur_value - 2 * last_value;
if(amount_char > 1)
return -1;
amount_char = 1;
}
last_value = cur_value;
if(amount_char > 3)
return -1;
else if(cur_value == SNC_ROMAN_V ||
cur_value == SNC_ROMAN_L || cur_value == SNC_ROMAN_D) {
if(amount_char > 1) return -1;
}
str++;
}
return answer;
}
char *arabicToRoman(char *str)
{
int number = atoi(str);
if(!number || number > SNC_ROMAN_MAX_NUMBER)
return NULL;
const char *units[] = {"","I","II","III","IV",
"V","VI","VII","VIII","IV"};
const char *tens[] = {"","X","XX","XXX","XL",
"L","LX","LXX","LXXX","XC"};
const char *hundreds[] = {"","C","CC","CCC","CD",
"D","DC","DCC","DCCC","CM"};
const char *thousands[] = {"","M","MM","MMM"};
char *answer = malloc(sizeof(char) * (SNC_ROMAN_MAXLEN + 1));
strcpy(answer, thousands[number / 1000]);
strcat(answer, hundreds[number / 100 % 10]);
strcat(answer, tens[number / 10 % 10]);
strcat(answer, units[number % 10]);
return answer;
}
int main(int argc, char *argv[])
{
if(argc < 2)
return printf("Simple numbers converter\n"
"\n"
"Synopsis: snc [number]\n");
int answer = romanToArabic(argv[1]);
if(answer == -1) printf("ERROR! %s is not roman number\n", argv[1]);
else printf("answer: %d\n", answer);
return 0;
}
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