Connect 4 game in C - c

Question

For a small project we need to make a connect four game. Our project is broken up into several parts with each week we are assigned a different part to work on.
This week we have to make up the work on the columns by this I mean we have to use a function is called get_column, and use this to read a valid column number from the user where the next piece will be played.
So we were supplied the following files connect4.h (File used to store functions), week8_object.o (ignore the name its just the current week of sem), and week8.c which is the file I am currently editing.
Note 1: The comment in the code is what the lecturer wrote for us as a note.
When I am compiling I get an error saying undeclared identifier for the if(column_full(board, col)==FALSE) statement (FALSE part). I thought this was declared in the .h file?
EDIT- After some googling I have found that people silence that error by having this in the header. Is it correct to have this in coherence with the .h file?:
#include <stdio.h>
#include "connect4.h"
#define FALSE 0
#define TRUE 1
/* get_move
Prompts the user to enter a column, then checks that
- the column is in the valid range (1-COLS)
- that the column is not full (use function column_full to check)
If an invalid column is entered, the user is reprompted until it is valid
Returns the column number between 1 and COLS
*/
int column_full ( int board[COLS][ROWS], int col ) { return TRUE;}
int get_move ( int board[COLS][ROWS] ){
int col;
printf("Please enter a column number:");
scanf("%d",&col);
if(col>=1 && col<=COLS){
if(column_full(board, col)==FALSE){
printf("You have placed a token in the %d column\n",col);
}
else{
printf("That column is full");
}
}
while(col<=0 || col>COLS){
printf("Your token has not been placed");
printf("Please enter a valid column: ");
scanf("%d",&col);
}
return(col);
}
Header file:
#ifndef CONNECT4_H
#define CONNEXT4_H 1
#define ROWS 6
#define COLS 7
// displays the board to the screen
int display_board ( int[COLS][ROWS] ) ;
// sets up the board to an empty state
int setup_board ( int[COLS][ROWS] ) ;
// Returns TRUE if the specified column in the board is completely full
// FALSE otherwise
// col should be between 1 and COLS
int column_full ( int[COLS][ROWS], int col ) ;
// prompts the user to enter a move, and checks that it is valid
// for the supplied board and board size
// Returns the column that the user has entered, once it is valid (1-COLS)
int get_move ( int[COLS][ROWS] ) ;
// adds a token of the given value (1 or 2) to the board at the
// given column (col between 1 and COLS inclusive)
// Returns 0 if successful, -1 otherwise
int add_move ( int b[COLS][ROWS], int col, int colour ) ;
// determines who (if anybody) has won. Returns the player id of the
// winner, otherwise 0
int winner ( int[COLS][ROWS] ) ;
// determines if the board is completely full or not
int board_full ( int[COLS][ROWS] ) ;
#endif

Answer 1

There are few issues in your code:
In get_move() function, the given condition "If an invalid column is entered, the user is reprompted until it is valid" is not been taken care. You might want to use while loop in case of invalid column entered.
column_full() in your code is called without parameters. This function takes two parameters (refer to you .h file). So, don't forget to add them in call.
You have to use return(col) to take care of "Returns the column number between 1 and COLS"
I don't want to write a code for you. It would be helpful for you in long run, if you code yourself.
Now, to answer your question:
It is perfectly fine to have nested if-else statements.

Answer 2

From your original code:
}; /* <<-- problem 1 */
else() {
/* ^^^^ <<-- problem 2 */
printf("That column is full");
}
Remove these and your code will compile. I won't discuss the logic issues.
So in diff notation:
--- connect4.c.orig 2015-09-19 14:34:36.743337010 -0400
+++ connect4.c 2015-09-19 14:34:23.488222720 -0400
## -24,9 +24,9 ##
if(col>=1 && col<=COLS){
if(column_full(board, col)==FALSE){
- printf("You have placed a token in the %d column\n",col);
+ printf("You have placed a token in the %d column\n",col);
}
- else(){
+ else{
printf("That column is full");
}
}