• Skip to main content
  • Skip to header right navigation
  • Skip to site footer

My Online Training Hub

Learn Dashboards, Excel, Power BI, Power Query, Power Pivot

  • Courses
  • Pricing
    • Free Courses
    • Power BI Course
    • Excel Power Query Course
    • Power Pivot and DAX Course
    • Excel Dashboard Course
    • Excel PivotTable Course – Quick Start
    • Advanced Excel Formulas Course
    • Excel Expert Advanced Excel Training
    • Excel Tables Course
    • Excel, Word, Outlook
    • Financial Modelling Course
    • Excel PivotTable Course
    • Excel for Customer Service Professionals
    • Excel for Operations Management Course
    • Excel for Decision Making Under Uncertainty Course
    • Excel for Finance Course
    • Excel Analysis ToolPak Course
    • Multi-User Pricing
  • Resources
    • Free Downloads
    • Excel Functions Explained
    • Excel Formulas
    • Excel Add-ins
    • IF Function
      • Excel IF Statement Explained
      • Excel IF AND OR Functions
      • IF Formula Builder
    • Time & Dates in Excel
      • Excel Date & Time
      • Calculating Time in Excel
      • Excel Time Calculation Tricks
      • Excel Date and Time Formatting
    • Excel Keyboard Shortcuts
    • Excel Custom Number Format Guide
    • Pivot Tables Guide
    • VLOOKUP Guide
    • ALT Codes
    • Excel VBA & Macros
    • Excel User Forms
    • VBA String Functions
  • Members
    • Login
    • Password Reset
  • Blog
  • Excel Webinars
  • Excel Forum
    • Register as Forum Member

questions on making a function for counting prime number between n1 to n2|VBA & Macros|Excel Forum|My Online Training Hub

You are here: Home / questions on making a function for counting prime number between n1 to n2|VBA & Macros|Excel Forum|My Online Training Hub
Avatar
sp_LogInOut Log In sp_Registration Register
sp_Search Search
Advanced Search|Last Search Results
Search
Forum Scope




Match



Forum Options



Minimum search word length is 3 characters - maximum search word length is 84 characters
sp_Search Search
sp_RankInfo
Lost password?
sp_CrumbsHome HomeExcel ForumVBA & Macrosquestions on making a function for …
sp_PrintTopic sp_TopicIcon
questions on making a function for counting prime number between n1 to n2
Avatar
John Tsang

New Member
Members
Level 0
Forum Posts: 2
Member Since:
April 7, 2019
sp_UserOfflineSmall Offline
1
April 7, 2019 - 6:11 pm
sp_Permalink sp_Print

I just created a function called prime, which is used to return True if the number is prime number and it works.

My problem is now i have to create a function called countprime number that between variable n1 to n2. I copied some coding in other forum and it works!

but i dont understand the logic behind for this countprime function, can anyone explain it to me?? 

What is countprime = countprime - prime(i) ??

Thanks

Option Explicit

Function prime(n As Integer) As Boolean
Dim i As Integer
prime = True
If n = 1 Then
prime = False
ElseIf n > 2 Then
For i = 2 To n - 1
If n Mod i = 0 Then
prime = False
Exit Function
End If
Next i
End If

End Function

Function countprime(n1 As Integer, n2 As Integer) As Integer
Dim i As Integer
For i = n1 To n2
countprime = countprime - prime(i)
Next i

End Function

Avatar
John Tsang

New Member
Members
Level 0
Forum Posts: 2
Member Since:
April 7, 2019
sp_UserOfflineSmall Offline
2
April 7, 2019 - 8:11 pm
sp_Permalink sp_Print

anyone can help?? 

🙁

Avatar
Velouria
London or thereabouts
Moderator
Members


Trusted Members

Moderators
Level 4
Forum Posts: 612
Member Since:
November 1, 2018
sp_UserOfflineSmall Offline
3
April 8, 2019 - 6:52 pm
sp_Permalink sp_Print

Prime(i) will return True if the number i is prime. In VBA true is equivalent to -1 and False is equivalent to 0, so subtracting the result of the Prime function will either subtract 0 (no change) or subtract -1, which is the same as adding 1, so increases the count of prime numbers.

Avatar
Rered Doame

New Member
Members
Level 0
Forum Posts: 1
Member Since:
August 18, 2022
sp_UserOfflineSmall Offline
4
August 18, 2022 - 10:53 pm
sp_Permalink sp_Print

from 1 to 1000 prime number list you can copy from web, when you search "prime numbers between 1 to 1000" you will give the answers.

sp_Feed
Go to top
Forum Timezone: Australia/Brisbane
Most Users Ever Online: 245
Currently Online: Andy Kirby, Ben Hughes, Alison West, Francis Drouillard
Guest(s) 10
Currently Browsing this Page:
1 Guest(s)
Top Posters:
SunnyKow: 1432
Anders Sehlstedt: 870
Purfleet: 412
Frans Visser: 346
David_Ng: 306
lea cohen: 219
A.Maurizio: 202
Jessica Stewart: 202
Aye Mu: 201
jaryszek: 183
Newest Members:
yashal minahil
Oluwadamilola Ogun
Yannik H
dectator mang
Francis Drouillard
Orlando Inocente
Jovitha Clemence
Maloxat Axmatovna
Ricardo Freitas
Marko Meglic
Forum Stats:
Groups: 3
Forums: 24
Topics: 6201
Posts: 27185

 

Member Stats:
Guest Posters: 49
Members: 31861
Moderators: 3
Admins: 4
Administrators: Mynda Treacy, Philip Treacy, Catalin Bombea, FT
Moderators: MOTH Support, Velouria, Riny van Eekelen
© Simple:Press —sp_Information

Sidebar

Blog Categories

  • Excel
  • Excel Charts
  • Excel Dashboard
  • Excel Formulas
  • Excel PivotTables
  • Excel Shortcuts
  • Excel VBA
  • General Tips
  • Online Training
  • Outlook
  • Power Apps
  • Power Automate
  • Power BI
  • Power Pivot
  • Power Query
microsoft mvp logo
trustpilot excellent rating
Secured by Sucuri Badge
MyOnlineTrainingHub on YouTube Mynda Treacy on Linked In Mynda Treacy on Instagram Mynda Treacy on Twitter Mynda Treacy on Pinterest MyOnlineTrainingHub on Facebook
 

Company

  • About My Online Training Hub
  • Disclosure Statement
  • Frequently Asked Questions
  • Guarantee
  • Privacy Policy
  • Terms & Conditions
  • Testimonials
  • Become an Affiliate

Support

  • Contact
  • Forum
  • Helpdesk - For Technical Issues

Copyright © 2023 · My Online Training Hub · All Rights Reserved. Microsoft and the Microsoft Office logo are trademarks or registered trademarks of Microsoft Corporation in the United States and/or other countries. Product names, logos, brands, and other trademarks featured or referred to within this website are the property of their respective trademark holders.