The document explains loops in programming, detailing the structure and purpose of various types of loops in Visual Basic, such as while, do, and for loops. It also covers important looping concepts like loop control variables, sentinel values, and updating loops. The document provides examples for clarity on how each loop operates within programming constructs.

2. Writing
Programs
Using
Loops
-Jan Carl Briones

3. What is Loop?
a loop is a programming structure that repeats a
sequence of instructions until a specific condition is met.
Visual Basic loop structures allow you to run one or more
lines of code repetitively. You can repeat the statements in a
loop structure until a condition is True, until a condition
is False, a specified number of times, or once for each
element in a collection.
-techterms.com
Visual Basic is a third-generation event-driven programming language
from Microsoft known for its Component Object Model (COM)
-en.Wikipedia.org

5. Increment and Decrement?
Increment and decrement operators are unary
operators that add or subtract one, to or from
their operand, respectively. They are commonly
implemented in imperative programming
languages.

6. Elements of Looping
A loop control variable-is basically a variable whose value determines
whether a program exits a loop or continues executing the loop code.
Start Input the value
of X X<=10 End
Update Counter
True
False

7. Elements of Looping
 a sentinel value (also referred to as a flag value, trip value, rogue
value, signal value, or dummy data) is a special value in the context of
an algorithm which uses its presence as a condition of termination,
typically in a loop or recursive algorithm.
Start Input the value
of X X<=Y End
Update Counter
True
False

8. Elements of Looping
 Updating loops-is done somewhere inside the loop, usually as the
last statement in the program can determine ahead of time how
many times the loop will repeat.
Start Input the value
of X X<=Y End
Update Counter
True
False

9. Types of Loops
While Loops
The While...End While construction runs a set of statements as
long as the condition specified in the While statement is True.-
https://docs.microsoft.com/

10. While x=1
Result will be “ON”
Start Start
True
False

11. Types of Loops
Do Loops
The Do...Loop construction allows you to test a condition at either the
beginning or the end of a loop structure. You can also specify whether to
repeat the loop while the condition remains True or until it becomes True.
.-https://docs.microsoft.com/

12. Do While X=1
Do Until X<=11
Do While Not x > 1
Y * 2
Start Start
True
False

13. Types of Loops
.-https://docs.microsoft.com/
For Loops
The For...Next construction performs the loop a set number of times. It uses a loop
control variable, also called a counter, to keep track of the repetitions. You specify the
starting and ending values for this counter, and you can optionally specify the amount
by which it increases from one repetition to the next.

14. For x=1 to 5
Input will repeat 5
times
Start Start
True
False

15. Types of Loops
.-https://docs.microsoft.com/
Nested For...Next Loop
When you have a loop within a loop, then you have created a
nested loop.

16. While x=1
Show “correct” 5
times
Start
end
True
False
Do until x > 2 For x= 1 to 5
the input value +1