c++ - Can't insert symbols into my matrix -

i have matrix written out here, , appears on screen fine want put symbols it. can't seem symbols (x) appear in it. sorry first time working arrays.

#include <iostream> #define width 70     #define height 20 using namespace std;  void main () {     char world[height][width];     // draws matrix     ( char = 0; < height; i++ ) {             ( char j = 0; j < width; j++ ) {                 world[i][j] = '.';                 cout << world[i][j];             }             cout << endl;     }     // 1st symbol @ coordinates 1, 1     int x, y;     x = 1, y = 1;     world[x][y] = 'x';     cout << world[x][y];      // 2nd symbol @ coordinates 2, 2     x = 2, y = 2;     world[x][y] = 'x';     cout << world[x][y];      //so on.. 

}

you have first insert xs, , then print grid, not other way around.