Testing declustering code

/// string test

#include <iostream>
#include <string>

using namespace std;

void mapdatatogrid(string mapdata);

int main()
{
    /// define map
    string mapdata;

    /// append map
    mapdata.append("!-6:-4:A:3:3!2:-4:A:3:3!-6:-4:A:3:3!-6:-4:A:3:3");

    mapdatatogrid(mapdata);


    return 0;
}


void mapdatatogrid(string mapdata)
{
    unsigned int findfirstcluster;
    unsigned int findclusterend;

    bool decluster = true;

    /// find first cluster
    findfirstcluster=findfirstcluster = mapdata.find("!");

    /// check clusting
    do
    {
        /// test first cluser
        if(findfirstcluster!=string::npos||findfirstcluster==0)
        {
            /// find the cluster end
            findclusterend=mapdata.find("!",findfirstcluster+1);

            if(findclusterend==0||findclusterend==string::npos)
            {
                decluster=false;

                cout << "break";
                break;
            }
            else
            {
                string newstring = mapdata.substr(findfirstcluster+1,(unsigned int)findclusterend-(findfirstcluster+1));

                cout << newstring.c_str() << endl;

                findfirstcluster = mapdata.find("!",findfirstcluster+1);
            }
        }
    }
    while(decluster==true);

    return;
}