详细设计的工具——PAD图[通俗易懂]

全栈程序员-站长 • 2022年8月13日上午11:36 • 未分类 • 阅读 3

详细设计的工具——PAD图[通俗易懂]目录一、PAD图的概念二、PAD图的基本符号三、PAD图的优点四、PAD图的应用一、PAD图的概念PAD图（ProblemAnalysisDiagram），由日本日立公司1973年发明以后，已得到一定程度的推广。它用二维树形结构的图来表示程序的控制流，将这种图翻译成程序代码比较容易。它既克服了传统的流程图不能清晰表现程序结构的缺点，又不像N-S图那样受到把全部程序约束在一个方框内的限制，这就是其优势所在。二、PAD图的基本符号(a)顺序；(b)选择；(c)C

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一、PAD图的概念

PAD图（Problem Analysis Diagram），由日本日立公司1973年发明以后，已得到一定程度的推广。它用二维树形结构的图来表示程序的控制流，将这种图翻译成程序代码比较容易。它既克服了传统的流程图不能清晰表现程序结构的缺点，又不像N-S图那样受到把全部程序约束在一个方框内的限制，这就是其优势所在。

二、PAD图的基本符号

详细设计的工具——PAD图[通俗易懂]

(a) 顺序；(b) 选择；(c) CASE多分支；(d) WHILE型循环； (e) UNTIL型循环；(f) 语句标号；(g) 定义图5.6 盒图（N-S图）

三、PAD图的优点

PAD图的优点表现在如下六个方面。

（1）使用PAD符号所设计出来的程序必然是结构化程序。

（2）PAD图所描绘的程序结构十分清晰。图5.6中最左面的竖线是程序的主线，即第一层结构。（3）随着程序层次的增加，PAD图逐渐向右延伸，每增加一个层次，图形向右扩展一条竖线。PAD图中竖线的总条数就是程序的层次数。

（4）用PAD图表现程序逻辑，易读、易懂、易记。PAD图是二维树形结构的图形，程序从图中最左竖线上端的结点开始执行，自上而下，从左向右顺序执行，遍历所有结点。容易将PAD图转换成高级语言源程序，这种转换可用软件工具自动完成，从而可省去人工编码的工作，有利于提高软件可靠性和软件生产率。

（5）既可用于表示程序逻辑，也可用于描绘数据结构。

（6）PAD图的符号支持自顶向下、逐步求精方法的使用。开始时设计者可以定义一个抽象的程序，随着设计工作的深入而使用def符号逐步增加细节，直至完成详细设计。如图5.7所示是一个使用def符号逐步细化的示例。

详细设计的工具——PAD图[通俗易懂]

(a) 初始的PAD图；(b) 使用def符号细化处理框P2 图5.7 使用def符号逐步细化

四、PAD图的应用

1.请根据下列伪码画出对应的PAD图。

GET(a[1],a[2],...a[10]);
max=a[1];
max2=a[2];
FOR i=2 TO 10
IF a[i]>max
max2=max;
max=a[i];
ELSE
IF a[i]>max2
max2=a[i]
ENDIF
ENDIF
ENDFOR
PUT(max,max2)
END

详细设计的工具——PAD图[通俗易懂]

2.请根据下列伪码画出对应的PAD图。

定义变量:i=7,S=0
DO WHILE i<=1000
IF(i被7整除)
THEN
S=S+i
输出:i
ENDIF
i=i+1
ENDDO
输出:S

详细设计的工具——PAD图[通俗易懂]

3.将下列N-S图转换为PAD图

详细设计的工具——PAD图[通俗易懂]

详细设计的工具——PAD图[通俗易懂] 4.将下列N-S图转换为PAD图

详细设计的工具——PAD图[通俗易懂]

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["https://img-blog.csdnimg.cn/dde0d839c5e24163b11c072fe7546b43.png","https://img-blog.csdnimg.cn/11bedab8c6784351a1dc2bf555712fa9.png","https://img-blog.csdnimg.cn/0b59c226e6f94ac1aecfec938cde9648.png"], "description": "详细设计的工具——PAD图[通俗易懂]目录一、PAD图的概念二、PAD图的基本符号三、PAD图的优点四、PAD图的应用一、PAD图的概念PAD图（ProblemAnalysisDiagram），由日本日立公司1973年发明以后，已得到一定程度的推广。它用二维树形结构的图来表示程序的控制流，将这种图翻译成程序代码比较容易…", "datePublished": "2022-08-13T11:36:00+08:00", "dateModified": "2022-08-13T11:36:00+08:00", "author": {"@type":"Person","name":"全栈程序员-站长","url":"https://javaforall.net/user-2/1","image":"//javaforall.net/wp-content/uploads/2025/04/2025042212371781.jpeg"} } </script> </body> </html>

详细设计的工具——PAD图[通俗易懂]

一、PAD图的概念

二、PAD图的基本符号

三、PAD图的优点

四、PAD图的应用

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