11.2 Constructs - Count-Controlled Loop

Objective

Use pseudocode to write a 'count-controlled' loop.

What is a Count-Controlled Loop?

A count-controlled loop is a type of loop that executes a specific number of times. The number of iterations is determined by a counter variable, which is initialized before the loop begins and typically incremented or decremented within the loop.

Pseudo-code for a Count-Controlled Loop

The general structure of a count-controlled loop in pseudo-code is as follows:

1. Initialization: Set a counter variable to a starting value (usually 0).
2. Loop Condition: Check if the counter variable is less than or equal to a specified end value.
3. Loop Body: If the loop condition is true, execute the statements within the loop body.
4. Update Counter: Increment or decrement the counter variable by a predefined value.
5. Repeat: Go back to step 2 and repeat until the loop condition becomes false.

Example: Printing Numbers from 1 to 5

Let's consider an example where we want to print numbers from 1 to 5 using a count-controlled loop.

Here's the pseudo-code:

Step	Action	Explanation
1	Set count to 1	Initializes the counter variable.
2	Loop: While count <= 5	Starts the loop, which will continue as long as the counter is less than or equal to 5.
3	Print the value of count	Executes the statement within the loop body, printing the current value of the counter.
4	Increment count by 1	Increments the counter variable, moving towards the loop termination condition.
Repeat steps 2-4	The loop continues until count becomes greater than 5.

Complete Pseudo-code

Here is the complete pseudo-code for the example:

    count = 1
    Loop: While count <= 5
        Print count
        count = count + 1
    

Diagram

A diagram illustrating the execution of this loop could be represented as follows: