/* A modification of boxfunc.cpp which uses a global variable dot = '+' */

#include <iostream.h>

void solid_line (int);
void blank_space (int);
void write_line (int, int);
void mid_line (int);

char dot = '+';

void main() {

  int side, row, count=0;

  do {
    cout << "Enter an odd integer bigger than or equal to 5: ";
    cin >> side;
    count++; if (count>=10) break;
  }
  while ((side%2==0) || (side < 5));

  cout << endl;

  solid_line(side);           // This is row 1 here.

  for (row=2; row <= (side - 1)/2; row++) write_line(row, side);

  mid_line(side);             // This is the middle row = (side+1)/2

  for (row=(side+3)/2; row<side; row++) write_line(side-row+1, side);

  solid_line(side);           // This is the last row = side.
}


void solid_line (int m)
{
  for (int i=1; i <= m; i++) cout << dot;
  cout << endl;
}

void blank_space (int m)
{
  for (int i=1; i <= m; i++) cout << " ";
}

void write_line (int m, int n)
{ 
  cout << dot;
  blank_space(m-2);
  cout << dot;
  blank_space(n - 2*m);
  cout << dot;
  blank_space(m-2);
  cout << dot << endl;
}

void mid_line (int m)
{ 
  cout << dot;
  blank_space((m-3)/2);
  cout << dot;
  blank_space((m-3)/2);
  cout << dot << endl;
}