Disease Spread

 #include <iostream>	// required for input and output
 #include <fstream>
 #include <cstdlib>	// required for rand() function
 using namespace std;
 
 // function prototypes
 void storeData(char cellArray[][18]);
 void printArray(char cellArray[][18]);
 int checkNeighbors(char cellArray[][18], int row, int col);
 void makeContagious(char cellArray[][18], int dayArray[][18], int row, int col, int neighbors);
 
 int main()
 {
 	char cells[49][18];	// stores the status of each cell
 	int days[49][18];	// stores the number of days the cell has been contagious or immune
 	int numNeighbors;
 
 	
 
 	storeData(cells);	// write status of cells to an array
 
 //	printArray(cells);
 
 	for (int m = 0; m < 49; m++)
 	{
 		for (int n = 0; n < 18; n++)
 		{
 			days[m][n] = 0;
 		}
 	}
 	
 
 //	for (int day = 1; day <= 14; day++)
 //	{
 		for (int i = 0; i < 49; i++)
 		{
 			for (int j = 0; j < 18; j++)
 			{
 		    	// determine number of infected cells around each cell
 		    	numNeighbors = checkNeighbors(cells, i, j);	
 						
 				// change status of healthy cells to contagious
 		    	// also set a newly contagious or immune cell's day count to zero
 				makeContagious(cells, days, i, j, numNeighbors);
 
 
 //				cout << cells[i][j] << " ";
 		    	cout << days[i][j] << " ";	// output to see if days is working 
 			}
 			cout << endl;
 		}
 		cout << endl;
 //	}
 
 
 	return 0;
 }
 
 // function to write cell status to an array
 void storeData(char cellArray[][18])
 {
 	ifstream infile;
 
 	infile.open("cells.txt");
 
 	if (infile.fail())
 	{
 		cout << "The file did not open correctly." << endl;
 		return;
 	}
 
 	for (int i = 0; i < 49; i++)
 	{
 		for (int j = 0; j < 18; j++)
 		{
 			infile >> cellArray[i][j];
 		}
 	}
 
 	infile.close();
 }
 
 // function to output the array
 void printArray(char cellArray[][18])
 {
 	ifstream infile;
 
 	infile.open("cells.txt");
 	
 	if (infile.fail())
 	{
 		cout << "The file did not open correctly." << endl;
 		return;
 	}
 
 	for (int i = 0; i < 49; i++)
 	{
 		for (int j = 0; j < 18; j++)
 		{
 			cout << cellArray[i][j] << " ";
 		}
 
 		cout << endl;
 	}
 
 	infile.close();
 }
 
 // function to check the status of surrounding cells
 int checkNeighbors(char cellArray[][18], int row, int col)
 {
 	int infected = 0;
 
 	// only check surrounding cells if cell is healthy
 	if (cellArray[row][col] != 'c' && cellArray[row][col] != 'i')
 	{
 		if ((row - 1) >= 0 && (col - 1) >= 0)	// not outside the array
 		{
 			if (cellArray[row-1][col-1] == 'c')
 			{
 				infected += 1;
 			}
 		}
 		if ((row - 1) >= 0)	// not outside the array
 		{
 			if (cellArray[row-1][col] == 'c')
 			{
 				infected += 1;
 			}
 		}
 		if ((row - 1) >= 0 && (col + 1) < 18)	// not outside the array
 		{
 			if (cellArray[row-1][col+1] == 'c')
 			{
 				infected += 1;
 			}
 		}
 		if ((col - 1) >= 0)	// not outside the array
 		{
 			if (cellArray[row][col-1] == 'c')
 			{
 				infected += 1;
 			}
 		}
 		if ((col + 1) < 18)	// not outside the array
 		{
 			if (cellArray[row][col+1] == 'c')
 			{
 				infected += 1;
 			}
 		}
 		if ((row + 1) < 49 && (col - 1) >= 0)	// not outside the array
 		{
 			if (cellArray[row+1][col-1] == 'c')
 			{
 				infected += 1;
 			}
 		}
 		if ((row + 1) < 49)	// not outside the array
 		{
 			if (cellArray[row+1][col] == 'c')
 			{
 				infected += 1;
 			}
 		}
 		if ((row + 1) < 49 && (col + 1) < 18)	// not outside the array
 		{
 			if (cellArray[row+1][col+1] == 'c')
 			{
 				infected += 1;
 			}
 		}
 	}
 
 	return (infected);	// return total number of infected neighbors 
 }
 
 // function to change the status of each cell depending on the number of neighbors that are infected
 void makeContagious(char cellArray[][18], int dayArray[][18], int row, int col, int neighbors)
 {
 	int chance;
 	
 	if (cellArray[row][col] != 'h' )	// if cells are contagious or immune
 	{
 		dayArray[row][col] += 1;			
 	}
 	
 	
 	if (neighbors == 1)
 	{
 		chance = 1 + rand() % 8;	// one in eight chance
 			if (chance == 5)
 			{
 				cellArray[row][col] = 'c';
 				dayArray[row][col] = 0;
 			}
 	}
 	if (neighbors == 2)
 	{
 		chance = 2 + rand() % 8;	// two in eight chance
 			if (chance == 5)
 			{
 				cellArray[row][col] = 'c';
 				dayArray[row][col] = 0;
 			}
 	}
 	if (neighbors == 3)
 	{
 		chance = 3 + rand() % 8;	// three in eight chance
 			if (chance == 5)
 			{
 				cellArray[row][col] = 'c';
 				dayArray[row][col] = 0;
 			}
 	}
 	if (neighbors == 4)
 	{
 		chance = 4 + rand() % 8;	// four in eight chance
 			if (chance == 5)
 			{
 				cellArray[row][col] = 'c';
 				dayArray[row][col] = 0;
 			}
 	}
 	if (neighbors == 5)
 	{
 		chance = 5 + rand() % 8;	// five in eight chance
 			if (chance == 5)
 			{
 				cellArray[row][col] = 'c';
 				dayArray[row][col] = 0;
 			}
 	}
 	if (neighbors == 6)
 	{
 		chance = 6 + rand() % 8;	// six in eight chance
 			if (chance == 5)
 			{
 				cellArray[row][col] = 'c';
 				dayArray[row][col] = 0;
 			}
 	}
 	if (neighbors == 7)
 	{
 		chance = 7 + rand() % 8;	// seven in eight chance
 			if (chance == 5)
 			{
 				cellArray[row][col] = 'c';
 				dayArray[row][col] = 0;
 			}
 	}
 	// if 8 neighbors are infected, the cell with turn contagious
 	if (neighbors == 8)	
 	{
 		cellArray[row][col] = 'c';
 		dayArray[row][col] = 0;
 	}
 	
 }