Loops in flowcharts, an essential concept in the Computer Science, which allows programs to repeat a set of instructions until a specific condition is met. The lesson begins by introducing the idea of a loop and explaining that loops are used whenever a task needs to be performed more than once, such as counting, repeated calculations, or validating user input. By using loops, programs become more efficient, organised, and easier to understand compared to writing the same instructions multiple times.
The lesson then describes how loops are represented in a flowchart using a decision (diamond) symbol along with flow lines that return to earlier steps. The decision checks a condition, and depending on whether the condition is true or false, the flow either repeats the process or exits the loop. This visual structure helps students clearly see how repetition works within a program and how the flow of control moves back and forth during execution.
To strengthen understanding, the lesson discusses practical examples. One example demonstrates a counting loop that displays numbers from 1 to 5 by repeatedly increasing a counter and checking a condition. Another example shows how a loop can be used for input validation, where the program keeps asking the user to enter a number within a specific range until valid input is provided. These examples highlight how loops are used to control repetition in real exam-style problems.
By the end of the lesson, students understand the importance of loops in programming and how they are used in everyday applications. The lesson improves students’ ability to interpret and draw flowcharts with loops correctly, helping them design logical solutions and confidently answer flowchart loop questions in the Computer Science examination.