Question: C++ Question int roman_char_to_number is an extra function that is not allowed. Modify the code to exclude : int roman_char_to_number(char c); from the class, but
C++ Question
int roman_char_to_number is an extra function that is not allowed.
Modify the code to exclude :
int roman_char_to_number(char c);
from the class, but keep the same functionality in the program (read file containing roman numerals and display its value if valid roman numeral).
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Code:
class roman
{
public:
roman();
void set_roman(string);
string get_roman() const;
int get_arabic();
private:
string roman_numeral;
bool valid;
int roman_char_to_number(char c);
};
roman::roman() //Constructor
{
valid = false;
}
void roman::set_roman(string text)
{
bool temp=true;
for (int i = 0; i < text.length(); ++i)
{
if(roman_char_to_number(text[i]) == -1)
{
temp = false;
break;
}
}
valid = temp;
if(valid)
roman_numeral = text;
}
int roman::roman_char_to_number(char c)
{
switch(c)
{
case 'I':
return 1;
case 'V':
return 5;
case 'X':
return 10;
case 'L':
return 50;
case 'C':
return 100;
case 'D':
return 500;
case 'M':
return 1000;
default:
return -1;
}
}
string roman::get_roman() const
{
return roman_numeral;
}
int roman::get_arabic()
{
int result = 0;
if(roman_numeral.length() == 0)
return 0;
for (int i = 0; i < roman_numeral.length(); ++i)
{
int s1 = roman_char_to_number(roman_numeral[i]);
if(i + 1 < roman_numeral.length())
{
int s2 = roman_char_to_number(roman_numeral[i+1]);
if(s1 >= s2)
{
result = result + s1;
}
else
{
result = result + s2 - s1;
i++;
}
}
else
{
result = result + s1;
i++;
}
}
return result;
}
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