转罗马字符_罗马字符是什么意思

public class NumToRoman
    {
        public static string ToRomanNum(int pNum)
        {      
            string[,] a=new string[3,10]{
                {"","I","II","III","IV","V","VI","VII","VIII","IX"},   
                {"","X","XX","XXX","XL","L","LX","LXX","LXXX","XCC"},   
                {"","C","CC","CCC","CD","D","DC","DCC","DCCC","CM"}
            };   
            string roman = "";   
            int t=0;   
            for(int m=0, i=1000; m<3; m++,i/=10){   
                t=(int)Math.Floor((double)((pNum%i)/(i/10)));
                int index = 2 - m;
                roman += a[index,t];   
            }   
            return roman;   
        }
    }