学步园

// 罗马字符串转数字
// VC2008通过

#include "stdafx.h"
#include<stdio.h>

// 罗马字符串转数字
int GetNumber(const char* strNum)
{
	int nValue = 0;
	while(*strNum != '\0')
	{
		int nN = 0;
		char c = *(strNum+1);
		switch(*strNum)
		{
		case 'I':
			nN = ((c != 'V' && c!= 'X') ? 1 : -1);
			break;
		case 'V':
			nN = 5;
			break;
		case 'X':
			nN = ((c != 'L' && c != 'C') ? 10 : -10);
			break;
		case 'L':
			nN = 50;
			break;
		case 'C':
			nN = ((c != 'D' && c != 'M') ? 100 : -100);
			break;
		case 'D':
			nN = 500;
			break;
		case 'M':
			nN = 1000;
			break;
		}

		nValue += nN;

		++strNum;
	}

	return nValue;
}

int _tmain(int argc, _TCHAR* argv[])
{
	char strData[] = "CMXCIX";

	int nValue = GetNumber(strData);
	printf("%s = %d\n", strData, nValue);

	return 0;
}