cin.getline ahhh!!!!!!!

[Grizwold]

ok i'm tryin to learn c++ and i'm using microsoft visual c++ (xmas present from my uncle) ok here's my problem, i have this function

void pause()
{
	char mybuffer [100];
	cout << "Press Any key to continue";
	cin.getline (mybuffer,100);

}

but everytime i call it it just flies right over the cin.getline unless i call it before the last like 5 lines of main

int main()
{
	char choicetmp[5];
	int choice;
//	char tempvar [256];
	cout << "1.) Add 2 Numbers" << endl;
	cout << "2.) Subtract 2 Numbers" << endl;
	cout << "3.) Divide 2 Numbers" << endl;
	cout << "4.) Multiply 2 Numbers" << endl;
	cout << endl;
	cout << "Enter the number you want: ";
	cin.getline(choicetmp,5);
	choice = atoi(choicetmp);
	switch(choice)
	{
		case 1: add();
	}
	pause();	
	return 0;
}

i have no idea what it is but it's driving me nuts!! any help would be appreciated!