char* add_roman(char augend[], char addend[]) {
int x = roman_to_int(augend);
int y = roman_to_int(addend);
int sum = x + y;
return int_to_roman(sum);
}
char* subtract_roman(char minuend[], char subtrahend[]) {
int x = roman_to_int(minuend);
int y = roman_to_int(subtrahend);
int difference = x - y;
return int_to_roman(difference);
}
//
// Глава 10. Упражнение 6. Перевод в/из Римских цифр.
//
#include "code.h"
//------------------------------------------------------------------------------
//input number
istream& operator>>(istream& is, Roman_int& r)
{
string num;
is >> num;
r = Roman_int( roman_to_int(num) );
return is;
}
//------------------------------------------------------------------------------
//output number
ostream& operator<<(ostream& os, const Roman_int& r)
{
return os << int_to_roman(r.as_int());
}
//------------------------------------------------------------------------------
//Converting from Roman to Arabic
int roman_to_int(string num)
{ //MMMDCCLII = 3752
int number=r_int(num[num.size()-1]), r=0;
for (int i=num.size()-1; i>0; i--)
if ( r_int(num[i-1]) > r_int(num[i]) ){
