Скачать или смотреть How to Use a for Loop to Increment in Multiples of 2 in Delphi

Learn how to create a `for` loop that increments by 2 instead of 1 in Delphi, ensuring efficient and accurate data output.
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This video is based on the question https://stackoverflow.com/q/68678718/ asked by the user 'Jordon Draggon' ( https://stackoverflow.com/u/16132729/ ) and on the answer https://stackoverflow.com/a/68678935/ provided by the user 'Freddie Bell' ( https://stackoverflow.com/u/2916756/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Understanding the Problem

If you're just starting with Delphi programming, you might find yourself needing to modify the way loops function to suit your specific needs. A common question when handling loops is how to increment a loop counter by values other than 1. In this case, we want a for loop that increments in multiples of 2, resulting in a specific output format rather than a simple list of consecutive numbers.

For example, if you're looking to output numbers like this:

[[See Video to Reveal this Text or Code Snippet]]

Instead of the default sequential output:

[[See Video to Reveal this Text or Code Snippet]]

You need to adjust how the loop operates.

The Solution: Using a For Loop in Delphi

While you could use a while loop to achieve this, as shown below, it's also possible to use a for loop efficiently by adjusting the increment value directly.

Using a For Loop

In Delphi, you can set the for loop to increment by 2 instead of 1. Here's how you can implement that in your code.

Code Example

Here is the code that demonstrates how to modify a for loop:

[[See Video to Reveal this Text or Code Snippet]]

Explanation of the Code

Initialization: The loop starts with the integer i set to 0.

Condition: The loop will execute as long as i is less than or equal to 5.

Incrementing: Instead of just incrementing i, we add a condition with mod 2 that allows only even numbers to be added to Memo1.

Output: The IntToStr(i) function converts the integer to a string format before displaying it in the Memo1 component.

Alternative: Using a While Loop

If you're comfortable using a while loop or if you prefer that over a for loop, here is how you can achieve the same result:

[[See Video to Reveal this Text or Code Snippet]]

Explanation of the While Loop

Initialization: Start the counter i at 0.

Loop Condition: The loop checks if i is less than 6.

Output: Just like the for loop, it adds the value of i to Memo1 as a string.

Increment: The Inc(i, 2) function increments i by 2 with each iteration.

Conclusion

Whether you choose to use a for loop or a while loop, both methods allow you to achieve the desired output of even numbers in Delphi. Adjusting the increment is a simple yet powerful way to control the flow of your program. By using conditional statements in a for loop or incrementing by a specified value in a while loop, you can manipulate data output as needed.

With these examples and explanations, you should now have a clear understanding of how to work with loop increments in Delphi. Happy coding!