3. 画出下列伪码程序的程序流程图和盒图 START IF p THEN WHILE q DO f END DO ELSE BLOCK g n END BLOCK END IF STOP

程序流程图：

START
|
IF p
|
WHILE q
|
f
|
END DO
|
ELSE
|
BLOCK
|
g
|
n
|
END BLOCK
|
END IF
|
STOP

盒图：

+---------+
|  START  |
+---------+
     |
     V
+---------+
|    IF   |
|    p    |
+---------+
|         |
V         |
+---------+
|   WHILE |
|    q    |
+---------+
|         |
V         |
+---------+
|    f    |
+---------+
|         |
V         |
+---------+
|   END   |
|   DO    |
+---------+
|         |
V         |
+---------+
|   ELSE  |
+---------+
|         |
V         |
+---------+
|  BLOCK  |
|    g    |
|    n    |
+---------+
|         |
V         |
+---------+
|   END   |
|  BLOCK  |
+---------+
|         |
V         |
+---------+
|   END   |
|    IF   |
+---------+
|         |
V         |
+---------+
|   STOP  |
+---------+