diff --git a/index.c b/index.c
new file mode 100644
index 0000000..446f917
--- /dev/null
+++ b/index.c
@@ -0,0 +1,89 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+
+#define GRID_SIZE 4
+#define LOWER 0
+#define UPPER 3
+
+void print_matrix(int matrix[GRID_SIZE][GRID_SIZE]);
+int random_number(int lower, int upper);
+void introduce_noise(int matrix[GRID_SIZE][GRID_SIZE]);
+
+int main()
+{
+	srand(time(0));
+
+	int message[GRID_SIZE][GRID_SIZE] = {
+		{  1,  1,  0,  1},
+		{  0,  1,  0,  0},
+		{  1,  1,  0,  1},
+		{  1,  0,  1,  1}};
+	 // {  0,  1,  2,  3},
+	 // {  4,  5,  6,  7},
+	 // {  8,  9, 10, 11},
+     // { 12, 13, 14, 15}};
+
+	print_matrix(message);
+	introduce_noise(message);
+	print_matrix(message);
+
+	return 0;
+};
+
+void print_matrix(int matrix[GRID_SIZE][GRID_SIZE])
+{
+	for (int i = 0; i < GRID_SIZE; i++)
+	{
+		for (int j = 0; j < GRID_SIZE; j++)
+		{
+			printf("%3i", matrix[i][j]);
+		}
+		printf("\n");
+	}
+};
+
+int random_number(int lower, int upper)
+{
+	int num = (rand() % (upper - lower + 1)) + lower;
+	return num;
+};
+
+void introduce_noise(int matrix[GRID_SIZE][GRID_SIZE])
+{
+	int random_X = random_number(LOWER, UPPER);
+	int random_Y = random_number(LOWER, UPPER);
+
+	printf("\n    (Y, X)");
+	printf("\n    (%i, %i)\n\n", random_Y, random_X);
+	
+	if (matrix[random_Y][random_X] == 0)
+	{
+		matrix[random_Y][random_X] = 1;
+	}
+	else if (matrix[random_Y][random_X] == 1)
+	{
+		matrix[random_Y][random_X] = 0;
+	};
+};
+
+// void parity_check_1(int matrix[GRID_SIZE][GRID_SIZE]){
+// 	int parity_bit = matrix[0][1];
+	
+// };
+
+// void parity_check_2(int matrix[GRID_SIZE][GRID_SIZE]){
+// 	int parity_bit = matrix[0][2];
+	
+// };
+
+// void parity_check_3(int matrix[GRID_SIZE][GRID_SIZE]){
+// 	int parity_bit = matrix[1][0];
+	
+// };
+
+// void parity_check_4(int matrix[GRID_SIZE][GRID_SIZE]){
+// 	int parity_bit = matrix[2][0];
+	
+// };
+