Calcolatrice Edmondo

integer display=0;

integer total=0;
string  flag="";
integer clean=0;

string ASCII = "             \n                   !\"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~";
integer ord(string chr)
{
    if(llStringLength(chr) != 1) return -1;
    if(chr == " ") return 32;
    return llSubStringIndex(ASCII, chr);
}
string chr(integer i)
{
    i %= 127;
    return llGetSubString(ASCII, i, i);
}

render()
{
    string s=(string)display;

    llMessageLinked(LINK_SET,100,s,NULL_KEY);
   // llSay(0,"display: "+(string)display+" total: "+(string)total+" flag: "+flag+" clean: "+(string)clean);
}

default
{
    state_entry()
    {
        integer i;
        for(i=1;i<=llGetNumberOfPrims();i++)
        {
            string n=llGetLinkName(i);
           // llSay(0,"n: "+n+" l: "+(string)llStringLength(n));
            if(llStringLength(n)<3)
            {

                llSetLinkPrimitiveParamsFast(i,[ PRIM_TEXT, " ", <1,1,1>, 1]);
            }
        }
        total=-1;

        display=0;
        render();
    }
    touch_start(integer count)
    {
        integer link=llDetectedLinkNumber(0);
        string n=llGetLinkName(link);
        if(ord(n)>=ord("0") && ord(n)<=ord("9"))
        {
            if(clean==1) display=0;
            display=display*10+(integer)n;
            clean=0;
        }
        else
        if(n=="C"){
           display=0; total=-1;
            flag="";
            clean=0;
        }
        else
        if(n=="AC"){

            total=-1;
            display=0;
            flag="";
            clean=0;
        }
        else
        if(n=="+")
        {
            flag="+";
            if(total==-1) total=display;

            clean=1;

        }
        else
        if(n=="-")
        {
            flag="-";
            if(total==-1) total=display;
            clean=1;

        }
        else
        if(n=="*")
        {
            flag="*";
            if(total==-1) total=display;
            clean=1;

        }
        else if(n=="/")
        {
            flag="/";
            if(total==-1) total=display;
            clean=1;
        }
        else if(n=="=")
        {
            if(flag=="+") total+=display;
            else if(flag=="-") total-=display;
            else if(flag=="*") total*=display;
            else if(flag=="/"){
                if(display!=0) total/=display;
            }
            display=total;
            clean=1;
        }
        render();
    }
}