#include <iostream>
#include <cstdlib>
using namespace std;

void graphPaper(int nrows, int ncols, int nrowsb, int ncolsb);

int main()
{
	//Output four sheets of customized graph paper.
	graphPaper(10, 10, 1, 4);
	cout << "\n";
	graphPaper(5, 5, 2, 6);
	cout << "\n";
	graphPaper(1, 1, 4, 10);   //one big box
	cout << "\n";
	graphPaper(10, 10, 1, 1);  //Each box contains just 1 blank.
	return EXIT_SUCCESS;
}

//Output graph paper with the given number of rows and columns of boxes.
//Each box will contain nrowsb and ncolsb of blanks.

void graphPaper(int nrows, int ncols, int nrowsb, int ncolsb)
{
	if (nrows < 1) {
		cerr << "Must have at least 1 row, not " << nrows << ".\n";
		exit(EXIT_FAILURE);
	}

	if (ncols < 1) {
		cerr << "Must have at least 1 column, not " << ncols << ".\n";
		exit(EXIT_FAILURE);
	}

	if (nrowsb < 1) {
		cerr << "Each box must contain at least 1 row of blanks, not "
			<< nrowsb << ".\n";
		exit(EXIT_FAILURE);
	}

	if (ncolsb < 1) {
		cerr << "Each box must contain at least 1 col of blanks, not "
			<< ncolsb << ".\n";
		exit(EXIT_FAILURE);
	}

	for (int r {0}; r < nrows; ++r) {
		for (int c {0}; c < ncols; ++c) {
			//Output a plus, followed by ncolsb dashes.
			cout << "+";
			for (int cb {0}; cb < ncolsb; ++cb) {
				cout << "-";
			}
		}
		cout << "+";
		cout << "\n";

		for (int rb {0}; rb < nrowsb;  ++rb) {
			for (int c {0}; c < ncols; ++c) {
				//Output vertical bar, followed by ncolsb blanks
				cout << "|";
				for (int cb {0}; cb < ncolsb; ++cb) {
					cout << " ";
				}
			}
			cout << "|";
			cout << "\n";
		}
	}

	for (int c {0}; c < ncols; ++c) {
		//Output a plus, followed by ncolsb dashes.
		cout << "+";
		for (int cb {0}; cb < ncolsb; ++cb) {
			cout << "-";
		}
	}
	cout << "+";
	cout << "\n";
}