Control Structure Introduction, Chapter - 4, Control Structures

Computer Science SLO Based Key Point Notes

👉👉👉 Computer Science 12th Class Notes (Main Page)

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Unit 4: Control Structures

4.1. Control Structure

• A statement used to control the flow of execution of instructions in a program is called a control structure.
• Control structures are used to implement the logic of a program.

There are three kinds of control structures: i.e.

1. Sequential Structure: In sequential structure, the statements of a program are executed in the same order in which they are written in the program.

2. Selection Structure: The selection structure is used for selecting a statement or group of statements for execution on the basis of a given condition. It is also known as decision structure.

3. Repetition structure: Repetition structure is used to execute a statement or group of statements repeatedly as long as the given condition is true. It is also known as iteration structure or Loop structure.

Types of Decision Structure

Types of Selection Structures:

1. The “if” statement
2. The if-else statement
3. The else-if statement
4. The switch statement

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4.1. Control Structure

4-1-1 The if statement

4.1.3. The else-if Statement:

4.1.4. The Switch Statement:

4.1.5. Differentiate between ELSE- IF and SWITCH

4.2. Loop

4.2.1. The for Loop

4.2.2. The While loop:

4.2.3. The do-while loop

4.2.4. Differentiate between while and do-while loop

4.2.5. The break and Continue Statement

4.2.6 Exit() Function

4.2.7. Nested Loop

Chapter 4 (Complete Key Point Notes)

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👉👉👉 Computer Science 12th Class Notes (Main Page)

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(National Book Foundation - As Federal Textbook Board, Islamabad 

Based on National Curriculum Pakistan 2026-2027 and Onward prescribed by Federal Board of Intermediate and Secondary Education, Islamabad, and All Pakistan Boards) 

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