Урок по информатике в 8 классе: Разработка алгоритмов.

Welcome to the lesson

Demo lesson: Conditional Statements and Logical operators Оператор выбора Таңдау операторы

YOU WILL: ×identify comparison operators; ×apply if/else statements; ×learn and apply Logical operators (AND,OR, NOT); ×8.3.3.1 - таңдау және қайталау операторларын программаны өңдеудің кіріктірілген ортасыныңда қолдану; ×8.3.3.1 использовать операторы выбора и циклов в интегрированной среде разработки программ (С/С++, Python, Delphi, Lazarus)

If / else statement If / else statement is a decision between two things. For example, if it is a weekday it is time to go to school. Otherwise, you can stay home. We use ‘if’ statement for making only one decision.

Switch Switch case statements are a substitute for long if statements that compare a variable to several integral values. ●The switch statement is a multiway branch statement. It provides an easy way to dispatch execution to different parts of code based on the value of the expression. ●Switch is a control statement that allows a value to change control of execution.

Flow Diagram

Select - таңдау - выбирать Indentation- шегініс - отступ to compare - салыстыру – сравнивать Conditional - шартты – условный value - мән - значение variable - айнымалы - переменная

WATCHING VIDEO

Discuss the following pictures Обсудите следующие фотографии

Find errors in the program fragment: Найдите ошибки в фрагменте программы: { float x; cin >> x; switch (x) {case 1: cout << «good»; break; case 2: cout << «bad»; break; default: ; ... }

int k=0; float m=k+2; switch(m%2) {case 0: cout<<"m- четное"; break; case 1: cout<<"m- нечетное"; … } Варианты ответов: 1. не хватает в строке,содержащей с case 1,оператора break 2. переменная m может быть только целого типа 3. нельзя после switch писать выражение m%2 4. отсутствует ветвь default

Questions 1.What is the function of the Case of statement? 2.What is the option?

Response to question 1.This is the CASE operator which is a generalization of the IF operator and allows you to make a choice from an arbitrary number of available options.

Response to question saved in the worm 2.Specifi is that the value of this combination field will not be written in the clatabase and will only be

r Practical work at the computer

Physical minute

Questions 3.What is the action of the RadioButton component?

3.The RadioButton component is ussually used along with other switches to select one of the mutually exclusive alternatives

Questio 4.What action does the ns CheckBox component perform?

Response to question 4.In the CheckBox component a chec mark is located in the gray box

Questions 5.What is the function of the Caption component properties?

Response to question 5.Descritive text appearing on an object to define or describe it.

6.What are the properties know? of the selection components, what types of components do you

6.The properties of the components BitBtn,RadioGroup, ChecBox,RadioButton, Memo,Image

Home work. Сreate a project in Lazarus programmable environment