Help With Algorithm Egyptian Numbers

So, i'm trying to figure out the algorithm for detecting egyptian numbers in the array and adding them properly.

I can't seem to understand how to go from here. I can't think of how to add the numbers together because when the user enters " IINNNNNNNN " and wants to subtract " I ", i don't know how i would code that >.>

Code:

---

void eMath::AddEgyptianNumbers()
{
        static char eNumber1[40];
        static char eNumber2[40];

        struct EgyptianDigit
        {
                char *EgyptianSymbol;
                int EgyptianValue;
        };

static const EgyptianDigit EgyptianDigitValue[]=
{
        {"Y",1000000},
        {"O",100000},
        {"/",10000},         
        {"L",1000},
        {"9",100},
        {"N",10},
        {"I",1},
};
       
}

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Sorry, but

Code:

---

        static char eNumber1[40];
        static char eNumber2[40];

---

Why static?

Aside from that, translate each component to an integer value, then subtract the integer values from each other and convert back to Egyptian numbers.

--
Mats

Thanks! It'll just take some time to get it done but i get it.