This program allows two people to play the
game of Connect four. Each player takes turns
dropping a checker in one of the open columns
on the board. The columns are numbered 1 to 7.
The first player to get four checkers in a row
horizontally, vertically, or diagonally wins
the game. If no player gets fours in a row and
and all spots are taken the game is a draw.
Player one's checkers will appear as r's and
player two's checkers will appear as b's.
Open spaces on the board will appear as .'s.

Player 1 enter your name: Bob

Player 2 enter your name: Jen

Current Board
1 2 3 4 5 6 7  column numbers
. . . . . . . 
. . . . . . . 
. . . . . . . 
. . . . . . . 
. . . . . . . 
. . . . . . . 

Bob it is your turn.
Your pieces are the r's.
Bob, enter the column to drop your checker: -1

-1 is not a valid column.
Bob, enter the column to drop your checker: 0

0 is not a valid column.
Bob, enter the column to drop your checker: 8

8 is not a valid column.
Bob, enter the column to drop your checker: eight

eight is not an integer.
Bob, enter the column to drop your checker: 5

Current Board
1 2 3 4 5 6 7  column numbers
. . . . . . . 
. . . . . . . 
. . . . . . . 
. . . . . . . 
. . . . . . . 
. . . . r . . 

Jen it is your turn.
Your pieces are the b's.
Jen, enter the column to drop your checker: 1

Current Board
1 2 3 4 5 6 7  column numbers
. . . . . . . 
. . . . . . . 
. . . . . . . 
. . . . . . . 
. . . . . . . 
b . . . r . . 

Bob it is your turn.
Your pieces are the r's.
Bob, enter the column to drop your checker: 5

Current Board
1 2 3 4 5 6 7  column numbers
. . . . . . . 
. . . . . . . 
. . . . . . . 
. . . . . . . 
. . . . r . . 
b . . . r . . 

Jen it is your turn.
Your pieces are the b's.
Jen, enter the column to drop your checker: 2

Current Board
1 2 3 4 5 6 7  column numbers
. . . . . . . 
. . . . . . . 
. . . . . . . 
. . . . . . . 
. . . . r . . 
b b . . r . . 

Bob it is your turn.
Your pieces are the r's.
Bob, enter the column to drop your checker: 5

Current Board
1 2 3 4 5 6 7  column numbers
. . . . . . . 
. . . . . . . 
. . . . . . . 
. . . . r . . 
. . . . r . . 
b b . . r . . 

Jen it is your turn.
Your pieces are the b's.
Jen, enter the column to drop your checker: 3

Current Board
1 2 3 4 5 6 7  column numbers
. . . . . . . 
. . . . . . . 
. . . . . . . 
. . . . r . . 
. . . . r . . 
b b b . r . . 

Bob it is your turn.
Your pieces are the r's.
Bob, enter the column to drop your checker: 5

Bob wins!!

Final Board
1 2 3 4 5 6 7  column numbers
. . . . . . . 
. . . . . . . 
. . . . r . . 
. . . . r . . 
. . . . r . . 
b b b . r . .