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三步逐过程法”解二级VisualBasic上机考试改错题

三步逐过程法”解二级VisualBasic上机考试改错题
三步逐过程法”解二级VisualBasic上机考试改错题

三步逐过程法”解二级VisualBasic上机考试改错题

一、改错题解法现状

许多同学为了掌握解决改错题的技巧和方法,一方面着重熟练VB集成开发环境中调试工具的使用,另一方面归纳总结了近几年来二级考试改错题中涉及到的错误类型。这些对于提高应试能力无疑是有帮助的。但是在实际考试中,他们也发现,解答改错题的方法沦为逐一去猜测错误类型,然后按模式来套解。毫无疑问,这一解法效率慢,正确率不高,而且即便正确解答出来,也有一种侥幸的感觉。之所以如此,根本的原因在于没有抓住具体题目算法逻辑特征这一主线,因而单纯的总结错误类型的意义也就不大了。

为此,我们可以采用一种比较完善的改错题解法——“三步逐过程法”。

二、“三步逐过程法”解法说明

“三步逐过程法”核心是把握题目算法逻辑特征,按照“从整体到部分,再由部分到整体”的思路排查错误,调试程序,具体步骤可分为三步:步骤一:把握题意,泛读程序,分析程序组成和各过程的功能;

步骤二:从通用过程入手, 逐过程输入并逐过程调试;

步骤三:输入并调试事件过程,完成对各通用过程调用和组装。

下面,我们结合一道改错题来具体说明每个步骤中的方法和技巧。

三、“三步逐过程法”解改错题举例

以江苏省二级VB上机考试中的一道考题为例。

已知下面程序的功能是找出2000以内这样的正整数N: 它的不同值的因子(包括1和N在内)之和是一个素数. 例如: 16: 1+2+4+8+16=31(下图为程序正确执行时的画面).

含有错误的源程序如下:

Option Explicit

Option Base 1

Private Sub Command1_Click()

Dim I As Integer, K As Integer, Sum As Integer

Sum = 0

For I = 2 To 2000

Call Fctor(I, Sum)

If Prime(Sum) Then

K = K + 1

Text1 = Text1.Text & Str(I) & " "

If K Mod 5 = 0 Then Text1 = Text1 & Chr(13) & Chr(10) End If

Next I

End Sub

Private Sub Fctor(N As Integer, S As Integer)

Dim I As Integer, J As Integer

Do While I < N

If N Mod I = 0 Then

S = S + I

End If

I = I + 1

Loop

End Sub

Private Function Prime(N As Integer) As Boolean

Dim m As Integer

For m = 2 To Sqr(N)

If N Mod m = 0 Then Exit Sub

Next m

Prime = True

End Function

“三步逐过程法”解题步骤:

步骤一:把握题意,泛读程序,分析程序组成和各过程的功能;

显然,该程序的组成如下图所示:

那么,我们如何分析出各个过程的功能呢?

核心技巧是从输出语句着手, 逆向推导, 分析各变量的含义, 进而根据过程的输入参数及其输出或

者反馈, 分析出此过程的功能。

1.标记出输出语句

输出语句有两句:

(1)、Text1 = Text1.Text & Str(I) & " "

(2)、If K Mod 5 = 0 Then Text1 = Text1 & Chr(13) & Chr(10)

2.逆向推导,分析各变量的含义

对于输出语句(1),显然是将符合条件的数I显示到文本框。而根据题意,符合条件的数必须满足:2000以内和因子和为素数两个条件,因此,我们从语句(1)逆向推导,我们知道I是由2到2000的循环变量,并且只有满足Prime(S um)为True的才能显示到文本框,因此,我们知道Sum应该是I的因子和;对于输出语句(2),后半句的功能是为了实现回车和换行,结合K Mod 5=0以及逆向找出的K=K+1,我们知道,K的功能是为了控制输出按照每5个换行进行。

3.分析过程功能

对于语句Call Fctor(I,Sum),由于此时的I为2到2000的循环变量,Sum 为I的因子和,因此我们可以判定Fctor的功能是求I的因子和,并将该和赋给S um变量;根据Prime(Sum),我们可以判定Prime的功能是对Sum值进行是否是素数的判定,如果是,则返回True,否则返回False。

步骤二: 从通用过程入手, 逐过程输入并逐过程调试.

核心技巧是将通用过程输入后, 根据步骤一中分析出的各过程的功能,用含有具体参数值的过程调用语句来调试过程, 即: 给定确定的输入, 看有无准确的输出或者反馈。

那么如何构造含有具体参数值的过程调用语句呢?

对于Function过程,由于有输入参数和返回值,因此比较好构造调用调试语句。譬如,对于Prime过程,由步骤一中我们已经知道其作用是用于判断输入参数是否为素数,如果为素数则返回True,否则返回False。因此我们可以构造:Print Prime(7);Prime(10)

为此,我们只要在窗体上放置一个按钮Command1,在Command1_Click中输入Print Prime(7);Prime(10)即可,若输出为“True False”,则该过程正确。如此操作,调试结果为:

由此,我们将Exit Sub修改为Exit Function,运行正确。

对于Sub过程,其没有返回值,因此该过程的反馈信息将可以通过两种方式得到,一种是直接在Sub中使用输出语句显示运行结果;一种是利用按地址传递的参数将反馈信息由被改变的实参带出。对于Fctor(N,S)过程,根据步骤一,知其功能是,求N的因子和并由S带出。为此,首先,我们根据给定的可以设定N为16。

1.输入Prime过程, 用print prime(7),prime(10)来调试;

2.输入fctor过程, 用

dim s as integer

call fctor(16,s)

print s

来调试.

步骤三: 对于事件过程, 若代码较长, 则逐程序块输入并调试(程序块通常以循环来区分)

核心技巧:在事件过程中, 将完成对通用过程的调用组装, 因此特别留意以下三点:

循环:注意循环变量的初值、终值和步长以及累积量的初值。

数组:元素从0开始还是从1开始。

过程:注意参数传递(Byval、ByRef),返回值类型,调用形式,具体的说包括:

1.实参与形参类型是否一致.

2.参数传递方法(ByVal与ByRef)是否正确

3.循环调用时, 同一变量调用前后值有无干涉,具体体现在: 前值没

有清空遗留在后值中或者动态数组元素未清空等, 此时错误表现在: 清空语句放置位置不对.

四、总结:

1.思维过程是微观到宏观

体现在: 由题意及变量含义推断过程作用; 逐过程输入调试后再进行事件工程中的调用和组装;

2.在调试通用过程时, 应用了数学中的特殊值法;

3.在组装事件过程时, 应用了工程中的经验法。

短文改错常考点总结

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(5)注意非谓语动词结构的使用(done doing to do)

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高考状元笔记完美整理版_高中生物知识点全集(绝对精品)高考英语短文改错方法

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Unfortunate, there are too many people in my family. (Unfortunately) 需要注意的是,形容词多用来做定、表、补语等,而副词只能在句子中作状语,修饰动词、形容词、副词或整个句子。第一例中的wonderful作定语修饰time,第二句的Unfortunately作状语修饰整个句子。 四.非谓动词细辨别 这是考查最多的错误形式之一。主要有分词和动名词类错误,也包括不定式类错误。例如:…in my spare time, but now I am interesting in football. (interested) Play football not only makes us grow up tall and strong but also …(playing) My parents love me…and will do all they can ∧make sure…(to) 上述二、三例分别是动名词作主语,和不定式作目的状语。一般的,现在分词有主动态和进行时的含义,而过去分词具有被动态和完成时的含义,不定式有将来时态的含义。五.习惯用法要记住 主要考查习惯搭配方面的基础知识。这也是历年高考的常考点,其错误表现形式主要有三种:多词、少词和搭配错误。例如: It was very kind for them to meet me at the railway station and…(of) We must keep in mind that we play for the team instead ∧ourselves. (of) 六.句子成分多分析 不同的句子成分要用不同的词类;不同的语景要选择不同的词语。这些都有待我们对句子结构和句子成分作细致的分析,才能找出用词不当的错误。例如: They ∧eager to know everything about China and…(were) I live in Beijing, where is the capital of China. (which)

短文改错解题技巧

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短文改错考点大总结

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【英语】短文改错答题技巧 考点汇总

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高考短文改错技巧_答题技巧总结精华版

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高中英语短文改错答题 技巧总结 Company number:【WTUT-WT88Y-W8BBGB-BWYTT-19998】

高中英语短文改错技巧总结 短文改错口诀: 动词形,名词数; 注意形和副; 非谓动词细辨别; 习惯用法要记住; 句子成分多分析; 逻辑错误须关注。 一. 动词形 主要包括两类错误:动词的时态和语态错误,以及主、谓不一致的错误。例如: My favorite sport are football. (is) Now my picture and prize is hanging in the library. (are) 上述两例分别属于时态错误和主、谓不一致错误。找出此类错误的关键是树立牢固的时态概念,注意短文内容发生或存在的时间,保持时间概念的一致性。 二. 名词数 指名词单、复数形式的用法错误。常表现为将名词复数写成单数。例如: …so that I’ll get good marks in all my subject. (subjects) 三. 区分形和副 及区分形容词和副词在句子中的作用和具体用法。这也是高考短文改错的常考点。例如: I’m sure we’ll have a wonderfully time together. (wonderful) Unfortunate, there are too many people in my family. (Unfortunately)

需要注意的是,形容词多用来做定、表、补语等,而副词只能在句子中作状语,修饰动词、形容词、副词或整个句子。第一例中的wonderful作定语修饰time,第二句的Unfortunately作状语修饰整个句子。 四. 非谓动词细辨别 这是考查最多的错误形式之一。主要有分词和动名词类错误,也包括不定式类错误。例如: …in my spare time, but now I am interesting in football. (interested) Play football not only makes us grow up tall and strong but also … (playing) My parents love me… and will do all they can ∧make sure… (to) 上述二、三例分别是动名词作主语,和不定式作目的状语。一般的,现在分词有主动态和进行时的含义,而过去分词具有被动态和完成时的含义,不定式有将来时态的含义。 五. 习惯用法要记住 主要考查习惯搭配方面的基础知识。这也是历年高考的常考点,其错误表现形式主要有三种:多词、少词和搭配错误。例如: It was very kind for them to meet me at the railway station and… (of) We must keep in mind that we play for the team instead ∧ ourselves. (of) 六. 句子成分多分析 不同的句子成分要用不同的词类;不同的语景要选择不同的词语。这些都有待我们对句子结构和句子成分作细致的分析,才能找出用词不当的错误。例如: They ∧eager to know everything about China and… (were) I live in Beijing, where is the capital of China. (which) 第一例漏掉了谓语动词were,这是受害于习惯的影响而导致的错误;第二例则是词类与它在句子中的成分不相符,where是副词,不能作主语。 七. 逻辑错误须关注 与句子的上、下文不一致,甚至相矛盾,属于逻辑性错误。如称谓上的张冠李戴,人名、地名、时间、方位等方面的错误,常是这类错误的考查对象。例如:

短文改错常见考点

短文改错技巧 一、短文改错常见考点设置: 1.考点设置之名词 命题特点:本来用复数,却用单数.改正方法:(1)根据名词前的修饰限定成份;(2)根据上下文的逻辑关系. 详解: 1).She said that she and my schoolmate all wished me success.() 2). After class we become stranger at once.() 3). They want me to devote all my time to my studies so that I’ll get marks in all my subject.() 4). On the way up I was busy taking picture since the scenery was so beautiful.() 5). There are advantage for students to work while studying at school.() ' 6). He had no ideas that the kitchen was not for guests.() 7). I looked at his other hands. () 2.考点设置之代词 命题特点:1.女性代词指代男性或相反;2.单数指代复数;3.代词词性误用。 改正方法:联系上下文的逻辑关系。 代词的错误特点:1.人称代词的偷换错误 2. 缺少人称代词的错误 3. 人称代词数的一致问题 4. 人称代词格的一致问题 详解: The Smiths did his best to make me feel at home.( ) I have a good friend who’s name is Liu Mei.( ) ] It was about noon when we arrived at the foot of the mountain. The three of them were very excited.() Soon I began to enjoy talking to myself on paper as I was learning to express me in simple English .() One day I wrote a little story and showed to my teacher .() Some students may also save up for our college or future use .() 3.考点设置之介词 命题特点及改正方法:介词涉及搭配错误,因此可从以下方面确定错误:1)介词的基本用法;2)习惯搭配;3)动词词类确定错误,如talk,, serve, wait等。 介词短语常常考,固定搭配要记牢。介词后边跟宾语,结合语境细推敲。 详解: We do not seem to get much time to talk about together.() I was so tired that I fell asleep at the moment my head touched the pillow. ()

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