int romanToInt(string s) {
if(s.length() == 0)
return 0;
int ans = 0, temp = getRomanValue(s[0]);
int curValue, lastValue = temp;
for(int i = 1; i < s.length(); ++ i)
{
curValue = getRomanValue(s[i]);
if(curValue == lastValue)
temp += getRomanValue(s[i]);
if(curValue > lastValue)
temp = getRomanValue(s[i]) - temp;
if(curValue < lastValue)
{
ans += temp;
temp = getRomanValue(s[i]);
}
lastValue = curValue;
}
return ans + temp;
}
int main()
{
char romanNumber[20];
int i, curNum;
while(1)
{
curNum=0;
printf("Input roman number: ");
scanf("%s", romanNumber);
if(checkRomanN(romanNumber)==0)
{
printf("Input a valid roman number\n");
continue;
}
for(i=0; i<strlen(romanNumber); i++)
{
if(getRomanValue(romanNumber[i])<getRomanValue(romanNumber[i+1]))
{
curNum+=getRomanValue(romanNumber[i+1]) - getRomanValue(romanNumber[i]);
i++;
}
else
curNum+=getRomanValue(romanNumber[i]);
}
if(curNum>256)
{
printf("Number is larger than 256\n");
continue;
}
else
{
printf("Roman number in decimal is: %d\n", curNum);
break;
}
}
return 1;
}
