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Computer Science · Class 10 · Chapter 11: Control Structure

8 min

Key points

Control structures determine the order in which statements are executed in a program
There are three types: Sequential, Selection (Conditional), and Iteration (Looping)
Sequential structure executes statements one after another in the order they appear
Selection structure uses IF-ELSE and SWITCH statements to make decisions
Iteration structure repeats a block of code using FOR, WHILE, and DO-WHILE loops
Nested structures allow placing one control structure inside another
Flowcharts are graphical representations of control structures using standard symbols
Pseudocode is a structured English-like language to represent algorithms

Definitions

Control Structure: A control structure is a statement that determines the order in which other statements are executed in a program.
Sequential Structure: Sequential structure is a control structure in which statements are executed one after another in the order they appear in the program.
Selection Structure: Selection structure is a control structure that allows the program to choose between two or more alternative paths based on a condition.
Iteration Structure: Iteration structure is a control structure that repeats a statement or block of statements while a condition is true.
Nested Structure: Nested structure is placing one control structure inside another control structure.

Worked example

Define control structure. Explain conditional control structure with syntax and example. (6 marks)

Control structure is a programming construct that determines the order in which statements are executed in a program. Conditional control structure allows the program to make decisions based on certain conditions and execute different sets of statements accordingly. Syntax: if(condition) { statements; } else { statements; } Example: if(marks >= 60) { cout << "Pass"; } else { cout << "Fail"; } This checks if marks are 60 or above to display Pass, otherwise displays Fail.

Common mistakes

Students confuse selection structure with iteration structure
Forgetting to draw proper flowchart symbols - diamond for decision, rectangle for process
Not writing exact textbook definitions word by word
Mixing up FOR loop syntax with WHILE loop syntax
Not showing proper entry and exit points in nested structure diagrams

Quick recap

Control structures determine execution order in programs. Three types: Sequential (statements execute one after another), Conditional/Selection (if-else, switch for decision making), and Iterative/Loop (for, while, do-while for repetition). Each has specific syntax in C++. Remember exact textbook definitions and proper syntax format for BSEK exams.

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