How to print a 2d array with a function in C? - c

Question

I'm trying to print a 2d array with a function, but I keep getting the error "pointer expected"
I'm trying to make a battleship-type grid. I'm fine with printing out the co-ordinate row and column, but I can't actually get the 2d array (which contains "." in every element) to print at all.
Any help would be appreciated, I'm very new to this. Thanks! :)
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
int length;
int width;
int i;
int j;
char invisible_board;
void board_setup(int *rows, int *columns){
char *invisible_board[*rows][*columns];
char *player_board[*rows][*columns];
for (i = 0; i < *rows; i++){
for (j = 0; j < *columns; j++){
invisible_board[i][j] = "."; //Sets all elements in hidden board to water
}
}
for (i = 0; i < *rows; i++){
for (j = 0; j < *columns; j++){
player_board[i][j] = ".";
}
}
}
void display(int *rows, int *columns, char *invisible_board){
printf(" ");
for (i=1; i < *rows +1;i++){
printf("%d ",i);
}
printf("\n"); //Prints top row of co-ordinates
for (i=1; i < *columns+1;i++){
printf("%d ",i);
for (j=0;j < *columns;j++){ //Prints left column of co- ordinates and rows of game board
printf(" %c ",invisible_board[i-1][j]);
}
printf("\n");
}
}
int main(void){
printf("Please enter the amount of rows in your board\n");
scanf("%d",&length);
printf("Please enter the amount of columns in your board\n");
scanf("%d",&width);
board_setup(&length,&width);
display(&length,&width,&invisible_board);
return (0);
}

Answer 1

this is the simplest changes I could make to your code to get you to working code.... now.... this isn't good code yet. But gets you started.
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
int length;
int width;
int i;
int j;
char invisible_board[100][100]; // dynamically allocate....
char player_board[100][100]; // dynamically allocate....
void board_setup(int *rows, int *columns){
for (i = 0; i < *rows; i++){
for (j = 0; j < *columns; j++){
invisible_board[i][j] = '.'; //Sets all elements in hidden board to water
}
}
for (i = 0; i < *rows; i++){
for (j = 0; j < *columns; j++){
player_board[i][j] = '.';
}
}
}
void display(int *rows, int *columns){
printf(" ");
for (i=1; i < *rows +1;i++){
printf("%d ",i);
}
printf("\n"); //Prints top row of co-ordinates
for (i=1; i < *columns+1;i++){
printf("%d ",i);
for (j=0;j < *columns;j++){ //Prints left column of co- ordinates and rows of game board
printf(" %c ",invisible_board[i-1][j]);
}
printf("\n");
}
}
int main(void){
printf("Please enter the amount of rows in your board\n");
scanf("%d",&length);
printf("Please enter the amount of columns in your board\n");
scanf("%d",&width);
board_setup(&length,&width);
display(&length,&width);
return (0);
}