Tic tac toe

I'm making a tic tac toe function that has a computer as the x (first player) and then the user as the o (second player). So far my code is:
#include <iostream>
#include <cmath>
#include <fstream>

using namespace std;

void nextMove()

void printBoard()
char board[3][3];
cout << board;
int main()
char o;
cout << "Please enter coordinates for your move: " << endl;
cin >> o

return 0;
In the function void nextMove I need to create a random number generator to put the x token on the array. I looked it up but didn't find much and I cant find the section in my book, also should I be using float for the o declaration to input coordinates?
Use code tags for posting your code, makes it much easier to read.

And if you need to the function for the generator look at this link: http://www.cplusplus.com/reference/cstdlib/rand/

You will also need to seed it for more random result, both under the <cstdlib> library.
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