Not sure if this counts as one question or four, as it has four parts, if so ple

Question

Not sure if this counts as one question or four, as it has four parts, if so please do a level and ill repost the next thanks, let me know

The program should read from standard input and write to standard output. Input will consist of a series of lines each containing a number to be converted. For each input line, the program should write a line of output that consists of the converted number terminated with a newline. The program should continuously read input and write output until all input is processed

Explanation / Answer

#include <iostream>
#include <string>
#include <cctype>
#include <algorithm>

using namespace std;

string singleRoman[10] = {"", "i", "ii", "iii", "iv", "v", "vi", "vii", "viii", "ix"};

// This function returns value of a Roman symbol
int value(char r)
{
if (r == 'I')
return 1;
if (r == 'V')
return 5;
if (r == 'X')
return 10;
if (r == 'L')
return 50;
if (r == 'C')
return 100;
if (r == 'D')
return 500;
if (r == 'M')
return 1000;

return -1;
}

// Returns Arabic value of roman numeral
int romanToArabic(string &str)
{
// convert string to upper case
transform(str.begin(), str.end(), str.begin(), ::toupper);

// Initialize result
int res = 0;

// Traverse given input
for (int i=0; i<str.length(); i++)
{
// Getting value of symbol s[i]
int s1 = value(str[i]);

if (i+1 < str.length())
{
// Getting value of symbol s[i+1]
int s2 = value(str[i+1]);

// Comparing both values
if (s1 >= s2)
{
// Value of current symbol is greater
// or equal to the next symbol
res = res + s1;
}
else
{
res = res + s2 - s1;
i++; // Value of current symbol is
// less than the next symbol
}
}
else
{
res = res + s1;
i++;
}
}
return res;
}

int main()
{
string roman;
while(getline(cin, roman))
{
cout << "Roman : " << roman << " Arabic: " << romanToArabic(roman) << endl;
}
return 0;
}

// This do level1 and level2 completely. For level 3 it is coverting all valid number but is not handling invalid chacrters.

Hope it helps.

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