gistfile1.txt

#include <iostream>
using namespace std;

const int ORDER = 4;
void fill (int m[], int order);
void outputMatrix (int m[], int order);
void replaceValue (int m[],  int n, int row, int column);
void numberAllowed (int m[], int order, int n, int row, int column);
bool checkRow (int m[], int order, int n, int row);
bool checkColumn (int m[], int order, int n, int column);

int main(){
	int matrix[ORDER];
	int row;
	int column;
	int n;
	fill (matrix, ORDER);
	outputMatrix (matrix, ORDER);
	do {
	   cout << "Enter the number to place, the row and the column, each separated by a space: ";
	   cin >> n;
	   cin >> row;
	   cin >> column;	
	   if (n <= 0 || n > ORDER){
			cout << "Thank you";
			cout << endl;
	   }
	   replaceValue (matrix, n, row, column);
	}while (n > 0 && n <= ORDER);
	
	
	return 0;
}

void fill (int m[], int order){
   for (int i = 0; i < order*order; i++){
        m[i] = 0;
   }
}
  
void outputMatrix (int m[], int order){
	int c = 0;
	for (int i = 0; i < order*order; i++){
	     c++;
			cout << m[i] << ' ';
			if (c == order){
				cout << endl;
				c = 0;
			}
		}
		cout << endl;	
}

void replaceValue (int m[], int n, int row, int column){
    int i;
    i = row * ORDER + column;
    m[i] = n;
    numberAllowed (m, ORDER, n, row, column);
}

void numberAllowed (int m[], int order, int n, int row, int column){
	if (checkRow (m, order, n, row) == true && checkColumn (m, order, n, column) == true){
		outputMatrix (m, order);
	}
	else if (checkRow (m, order, n, row) == false && checkColumn (m, order, n, column) == false){
		cout << "Number not allowed" << endl;
	}
}

bool checkRow (int m[], int order, int n, int row){
	
	for (int i = 0; i < order; i++){
		if (m[order] * i * row == n){
			
	}
        
        }
        else{
        	return true;
        }
}