[joe_bruin]

you're searching the wrong planets. A is not initialized in this function.

void Planet::find()
{
Planet A[5];
char find[100];
cout<<"Find which planet?"<<endl;
cin>>find;
//cout<<"Find is "<<find<<endl;
//bool found=false;
for(int i=0; i<=5 ; i++)
{
if (strcmp(find, A[i].n)==0)
{
//found=true;
cout<<"radius"<<A[i].r;
}
else
{
cout<<"Planet not found"<<endl;
}
}
}