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t2.c

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+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+int board[9][9] = {0}, f[9] = {0};
+void f1()
+{
+    printf("|");
+    for (int i = 0; i < 23; i++)
+    {
+        printf("-");
+    }
+    printf("|\n");
+}
+void operate()
+{
+    for (int i = 0; i < 9; i++)
+    {
+        if (i % 3 == 0)
+        {
+            f1();
+        }
+        printf("| ");
+        for (int j = 0; j < 9; j++)
+        {
+            if (j % 3 == 0 && j)
+            {
+                printf("| ");
+            }
+            printf("%d ", board[i][j]);
+        }
+        printf("|\n");
+    }
+    f1();
+}
+void Random(int n)
+{
+    int k = 9;
+    while (k)
+    {
+        int i = rand() % 3, j =rand() % 9;
+        i += (n - 1) * 3;
+        if (f[i] == 0)
+        {
+            if (board[i][j] == 0)
+            {
+                board[i][j] = k;
+                k--;
+            }
+        }
+        int cnt = 0;
+        for (int m = 0; m < 9; m++)
+        {
+            if (board[i][m])
+            {
+                cnt++;
+            }
+        }
+        if (cnt == 3)
+        {
+            f[i] = 1;
+        }
+    }
+}
+int main()
+{
+    printf("随机生成一个9×9的不完整的矩阵：\n");
+    srand(time(NULL));
+    Random(1);
+    Random(2);
+    Random(3);
+    operate();
+}