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#include <stdio.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) {
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;
}
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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