diff --git a/program3.c b/program3.c
new file mode 100644
index 0000000..473147d
--- /dev/null
+++ b/program3.c
@@ -0,0 +1,114 @@
+#include <stdio.h>
+#include <stdbool.h>
+
+void printMatrix(int matrix[9][9]) {
+    for (int i = 0; i < 9; i++) {
+        if (i == 0 || i == 3 || i == 6) {
+            printf("|-----------------------|\n");
+        }
+        for (int j = 0; j < 9; j++) {
+            if (j == 0 || j == 3 || j == 6) {
+                printf("| ");
+            }
+            if (matrix[i][j] == 0) {
+                printf(". ");
+            }
+            else {
+                printf("%d ", matrix[i][j]);
+            }
+            printf("|\n");
+        }
+        printf("|-----------------------|\n");
+    }
+}
+
+// 检查行中数字1 - 9是否最多出现一次
+bool checkRows(int matrix[9][9]) {
+    for (int i = 0; i < 9; i++) {
+        int count[9] = {0};
+        for (int j = 0; j < 9; j++) {
+            if (matrix[i][j] > 0 && matrix[i][j] <= 9) {
+                int num = matrix[i][j] - 1;
+                if (count[num] > 0) {
+                    return false;
+                }
+                count[num]++;
+            }
+        }
+    }
+    return true;
+}
+
+// 检查列中数字1 - 9是否最多出现一次
+bool checkColumns(int matrix[9][9]) {
+    for (int j = 0; j < 9; j++) {
+        int count[9] = {0};
+        for (int i = 0; i < 9; i++) {
+            if (matrix[i][j] > 0 && matrix[i][j] <= 9) {
+                int num = matrix[i][j] - 1;
+                if (count[num] > 0) {
+                    printf("The number %d in the col %d has been used!\n", matrix[i][j], j);
+                    return false;
+                }
+                count[num]++;
+            }
+        }
+    }
+    return true;
+}
+
+// 检查3x3子矩阵中数字1 - 9是否最多出现一次
+bool checkSubMatrices(int matrix[9][9]) {
+    for (int row = 0; row < 9; row += 3) {
+        for (int col = 0; col < 9; col += 3) {
+            int count[9] = {0};
+            for (int i = row; i < row + 3; i++) {
+                for (int j = col; j < col + 3; j++) {
+                    if (matrix[i][j] > 0 && matrix[i][j] <= 9) {
+                        int num = matrix[i][j] - 1;
+                        if (count[num] > 0) {
+                            printf("The number %d in the block %d has been used!\n", matrix[i][j], (row / 3) * 3 + col / 3);
+                            return false;
+                        }
+                        count[num]++;
+                    }
+                }
+            }
+        }
+    }
+    return true;
+}
+
+// 判断矩阵是否满足数独矩阵的定义
+bool isSudokuMatrix(int matrix[9][9]) {
+    if (!checkRows(matrix)) {
+        return false;
+    }
+    if (!checkColumns(matrix)) {
+        return false;
+    }
+    return checkSubMatrices(matrix);
+}
+
+int main() {
+    printf("The original Sudoku matrix: \n");
+    int matrix[9][9] = {
+        {5, 3, 0, 0, 7, 0, 0, 0, 0},
+        {6, 0, 0, 1, 9, 5, 0, 0, 0},
+        {0, 9, 8, 0, 0, 0, 0, 6, 0},
+        {8, 0, 0, 0, 6, 0, 0, 0, 3},
+        {4, 0, 0, 8, 0, 3, 0, 0, 1},
+        {7, 0, 0, 0, 2, 0, 0, 0, 6},
+        {0, 6, 0, 0, 0, 0, 2, 8, 0},
+        {0, 0, 0, 4, 1, 9, 0, 0, 5},
+        {0, 0, 0, 0, 8, 0, 0, 7, 9}
+    };
+    printMatrix(matrix);
+    bool result = isSudokuMatrix(matrix);
+    if (result) {
+        printf("True:Valid initial Sudoku matrix!\n");
+    } else {
+        printf("False:Invalid initial Sudoku matrix!\n");
+    }
+    return 0;
+}