Beheld Basal Software Tutorials - Tutorial Addendum - Bend Statements
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(Continued from antecedent part...)
Here is the output:
Found a prime number: 3
Found a prime number: 5
Found a prime number: 7
Found a prime number: 11
Found a prime number: 13
Found a prime number: 17
Found a prime number: 19
Found a prime number: 23
Found a prime number: 29
The achievement looks good. Some addendum about the sample script:
- Nested loops, one bend central addition loop, are used.
- The alien bend goes through integers amid 3 and 20, and skips even numbers with "Step 2"
- The close bend goes determines if the accepted accumulation "i" is a prime or not
- The close bend has a codicillary "Exit For" account to abolish the bend as anon as
"i" has been bent as a non-prime number.
"While" Statements
Another blazon of bend statements is alleged "While" statement, which has the afterward syntax:
While condition
statement_block (multiple statements)
Wend
where "condition" is a Boolean value.
The way a "While" account is accomplished looks like:
Step 1: Analysis Boolean amount of "condition".
Step 2: If the accepted amount of "condition" is "True", abide with Move 4.
Step 3: If the accepted amount of "condition" is "False", abolish the loop.
Step 4: Assassinate "statement_block" amid in the "While ... Wend" loop.
Step 5: Abide with Move 1.
The argumentation of a "While" account is simpler than a "For ... Next" statement. But you accept to manage
the action carefully, so that its amount will become "False" at some point to abolish the loop.
Notice that there assume to be no "Exit" account to breach "While" bend early.
"While" Account Example
To advice you accept how "While" statements work, I wrote the afterward the example, loop_while.html:
<html>
<body>
<!-- loop_while.html
Absorb (c) 2006 by Dr. Yang. http://www.yang.com/
-->
<pre>
<script language="vbscript">
document.writeln("")
i = 3
While i <= 30
bIsPrime = True
j = 2
While j <= i2 And bIsPrime
bIsPrime = i Mod j > 0
j = j + 1
Boat
If bIsPrime Then
document.writeln("Found a prime number: " & i)
End If
i = i + 2
Wend
</script>
</pre>
</body>
</html>
Here is the output:
Found a prime number: 3
Found a prime number: 5
Found a prime number: 7
Found a prime number: 11
Found a prime number: 13
Found a prime number: 17
Found a prime number: 19
Found a prime number: 23
Found a prime number: 29
The archetype formed perfectly. What do you think?
(Continued on next part...)
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