Unable to understand the syntax errors in c++ - c++

Question

I am trying to make a tic tac toe game in c++, but I am getting the following errors in my code(Not completed yet). am I passing the arrays to the function correctly
[Error] invalid conversion from 'char(*)[3]'to 'char'
and
[Error] initializing argument 1 of 'void player_input(char)'
#include <iostream>
using namespace std;
void draw_grid(char display[][3]){
cout<<"Board\n"<<"-------------"<<endl;
for(int x=0;x<3;x++){
for(int y=0;y<3;y++){
cout<<"| "<<display[x][y]<<" ";
}
cout<<"|"<<endl<<"-------------";
cout<<endl;
}
}
void player_input(char);
int main(){
char arr[3][3]={
{'1','2','3'},
{'4','5','6'},
{'7','8','9'}
};
draw_grid(arr);
player_input(arr);
draw_grid(arr);
return 0;
}
void player_input(char size[][3]){
char sign;
char number;
cout<<"X or O"<<endl;
cin>>sign;
cout<<"Choose a number\n";
cin>>number;
switch (number){
case '1':
size[0][0]=sign;
break;
case '2':
size[0][1]=sign;
break;
case '3':
size[0][3]=sign;
break;
case '4':
size[1][0]=sign;
break;
case '5':
size[1][1]=sign;
break;
case '6':
size[1][2]=sign;
break;
case '7':
size[2][0]=sign;
break;
case '8':
size[2][1]=sign;
break;
case '9':
size[2][2]=sign;
break;
}
}

Answer 1

void player_input(char);
Your function definition doesn't match the one below void player_input(char size[][3]). Before execution, the compiler tries to match each function call with its appropriate definition. It fails as it only sees the one above (which takes a single character), being matched with player_input(arr); with arr being a 2D array char arr[3][3].
You can modify the line above to make it work:
void player_input(char[3][3]);
Since you're using C++, you should ditch static arrays and consider using one of the modern C++ containers like std::vector.

Answer 2

Here's the fix:
#include <iostream>
using namespace std;
void draw_grid(char display[][3]){
cout<<"Board\n"<<"-------------"<<endl;
for(int x=0;x<3;x++){
for(int y=0;y<3;y++){
cout<<"| "<<display[x][y]<<" ";
}
cout<<"|"<<endl<<"-------------";
cout<<endl;
}
}
void player_input(char size[][3]){
char sign;
char number;
cout<<"X or O"<<endl;
cin>>sign;
cout<<"Choose a number\n";
cin>>number;
switch (number){
case '1':
size[0][0]=sign;
break;
case '2':
size[0][1]=sign;
break;
case '3':
size[0][3]=sign;
break;
case '4':
size[1][0]=sign;
break;
case '5':
size[1][1]=sign;
break;
case '6':
size[1][2]=sign;
break;
case '7':
size[2][0]=sign;
break;
case '8':
size[2][1]=sign;
break;
case '9':
size[2][2]=sign;
break;
}
}
int main(){
char arr[3][3]={
{'1','2','3'},
{'4','5','6'},
{'7','8','9'}
};
draw_grid(arr);
player_input(arr);
draw_grid(arr);
return 0;
}
You had 2 declarations of function player_input(). Also if you are not declaring the function type inside main(), you need to place the function definition before main().