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2.c

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+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+
+void printMatrix(char matrix[9][9])
+{
+    for (int i = 0; i < 9; i++)
+    {
+        for (int j = 0; j < 9; j++)
+        {
+            printf("%c ", matrix[i][j]);
+        }
+        printf("\n");
+    }
+}
+
+void generateRow(char row[9], int nums[9])
+{
+    // Fill the row with '0'
+    for (int i = 0; i < 9; i++)
+    {
+        row[i] = '0';
+    }
+
+    // Place three unique numbers from the provided nums array into random positions
+    for (int i = 0; i < 3; i++)
+    {
+        int pos;
+        do
+        {
+            pos = rand() % 9;
+        } while (row[pos] != '0'); // Find an empty position
+        row[pos] = nums[i] + '0'; // Store as char
+    }
+}
+
+void generateUniqueRows(char matrix[9][9], int startRow) {
+    int nums[9] = { 1, 2, 3, 4, 5, 6, 7, 8, 9 };
+    // Shuffle numbers
+    for (int i = 8; i > 0; i--) {
+        int j = rand() % (i + 1);
+        int temp = nums[i];
+        nums[i] = nums[j];
+        nums[j] = temp;
+    }
+
+    // Fill 3 rows with 3 unique numbers each
+    for (int i = 0; i < 3; i++) {
+        generateRow(matrix[startRow + i], nums + i * 3);
+    }
+}
+
+int main() {
+    srand(time(NULL)); // Set random seed
+
+    char matrix[9][9];
+
+    // Generate the first three rows
+    generateUniqueRows(matrix, 0);
+
+    // Generate the next three rows
+    generateUniqueRows(matrix, 3);
+
+    // Generate the last three rows
+    generateUniqueRows(matrix, 6);
+
+    // Print the matrix
+    printMatrix(matrix);
+
+    return 0;
+}