diff --git a/pj2.c b/pj2.c
new file mode 100644
index 0000000..b8124c1
--- /dev/null
+++ b/pj2.c
@@ -0,0 +1,83 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+
+#define SIZE 9
+
+void generateMatrix(int matrix[SIZE][SIZE]);
+void printMatrix(int matrix[SIZE][SIZE]);
+
+int main() {
+    int matrix[SIZE][SIZE] = {0};
+    srand(time(NULL)); 
+    
+    generateMatrix(matrix);
+    printMatrix(matrix);
+
+    return 0;
+}
+
+void generateMatrix(int matrix[SIZE][SIZE]) {
+    int row, col, num, count;
+    int used[SIZE + 1];  // 标记每行是否已使用特定数字
+
+    for (row = 0; row < SIZE; row++) {
+        for (int i = 1; i <= SIZE; i++) used[i] = 0;  
+
+        count = 0;
+        while (count < 3) {  
+            num = rand() % SIZE + 1;  
+            col = rand() % SIZE;      
+
+            if (matrix[row][col] == 0 && used[num] == 0) {  // 检查该数字和位置是否已使用
+                matrix[row][col] = num;
+                used[num] = 1;
+                count++;
+            }
+        }
+    }
+
+    // 确保每个3行的区块都包含1-9
+    for (int block = 0; block < SIZE; block += 3) {
+        int numbers[SIZE + 1] = {0};
+
+        for (int r = block; r < block + 3; r++) {
+            for (int c = 0; c < SIZE; c++) {
+                int val = matrix[r][c];
+                if (val != 0) {
+                    numbers[val] = 1;
+                }
+            }
+        }
+
+        for (num = 1; num <= SIZE; num++) {
+            if (numbers[num] == 0) {  
+                do {
+                    row = block + rand() % 3;
+                    col = rand() % SIZE;
+                } while (matrix[row][col] != 0); 
+                matrix[row][col] = num;
+            }
+        }
+    }
+}
+
+void printMatrix(int matrix[SIZE][SIZE]) {
+    printf("|-------|-------|-------|\n");
+    for (int i = 0; i < SIZE; i++) {
+        for (int j = 0; j < SIZE; j++) {
+            if (j % 3 == 0) printf("| ");  
+
+            if (matrix[i][j] == 0) {
+                printf(". ");
+            } else {
+                printf("%d ", matrix[i][j]);
+            }
+        }
+        printf("|\n");  
+
+        if (i % 3 == 2) {
+            printf("|-------|-------|-------|\n");
+        }
+    }
+}
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