a013. 羅馬數字 -- NPSC 模擬試題 | From: [111.250.234.50] | 發表日期 : 2019-11-12 21:51

a013. 羅馬數字 -- NPSC 模擬試題 | From: [111.250.234.50] | 發表日期 : 2019-11-12 21:52

#include<iostream>
	using namespace std;
	int roman_to_number( string s )
	{
	int output = 0;
	for( int i = 0 ; i < s.length() ; i++)
	{
	switch( s[i] )
	{
	case 'I':
	output++;
	break;
	case 'V':
	output += 5;
	if( s[i-1] == 'I' )
	output -= 2;
	break;
	case 'X':
	output += 10;
	if( s[i-1] == 'I' )
	output -= 2;
	break;
	case 'L':
	output += 50;
	if( s[i-1] == 'X' )
	output -= 20;
	break;
	case 'C':
	output += 100;
	if( s[i-1] == 'X' )
	output -= 20;
	break;
	case 'D':
	output += 500;
	if( s[i-1] == 'C' )
	output -= 200;
	break;
	case 'M':
	output += 1000;
	if( s[i-1] == 'C' )
	output -= 200;
	break;
	}
	}
	return output;
	}
	string number_to_roman( int i )
	{
	string output = "";
	if( i == 0 )
	return (output = "ZERO");
	int temp;
	while( i > 0 )
	{
	if( i >= 1000 )
	{
	i -= 1000;
	output += "M";
	}
	else if( i >= 900 )
	{
	i -= 900;
	output += "CM";
	}
	else if( i >= 500 )
	{
	i -= 500;
	output += "D";
	}
	else if( i >= 400 )
	{
	i -= 400;
	output += "CD";
	}
	else if( i >= 100 )
	{
	i -= 100;
	output += "C";
	}
	else if( i >= 90 )
	{
	i -= 90;
	output += "XC";
	}
	else if( i >= 50 )
	{
	i -= 50;
	output += "L";
	}
	else if( i >= 40 )
	{
	i -= 40;
	output += "XL";
	}
	else if( i >= 10 )
	{
	i -= 10;
	output += "X";
	}
	else if( i >= 9 )
	{
	i -= 9;
	output += "IX";
	}
	else if( i >= 5 )
	{
	i -= 5;
	output += "V";
	}
	else if( i >= 4 )
	{
	i -= 4;
	output += "IV";
	}
	else
	{
	i -= 1;
	output += "I";
	}
	}
	return output;
	}
	int main()
	{
	string num1, num2;
	while( cin >> num1 )
	{
	if( num1 == "#" )
	break;
	cin >> num2;
	cout << number_to_roman( abs( roman_to_number( num1 ) - roman_to_number( num2 ) ) ) << endl;
	}
	return 0;
	}  會錯 別抄