your original code was fine except for one minor thing. you must first assign strp to input. like this:

Code:
void newperson()
{
	int count, numppl;
	char *strp=input;
	*strp = input[20];
	cout<<"How many people do you want to introduce?"<<endl;
	cin>>numppl;
	for (count=0 ; count <=numppl ; count=count+1)
	{
		cin.get (input, 20);
	}
}
just add the '=input' after 'char *strp'