A problem when running a While Activity

[Hallgrimur_Ingolfsson_HI (Hallgrímur Ingólfsson - HI)]

Hi, still here. Now when running a While problem to find prime numbers, the program tells me that 0 and 1 are prime numbers. Otherwise, the results are right. What am I missing?

[sanjay3 (Sanjay)]

Hi @Hallgrimur_Ingolfsson_HI

1. Create a Counter variable(int32)… Counter=2
2. create a variable(int32) (NumberToCheck)
3. IsPrime (Boolean)

For example
NumberToCheck=13

While
While (counter <= Math.Sqrt(numberToCheck))
If (numberToCheck Mod counter = 0)
Assign: isPrime = False
Break
Else
Assign: counter = counter + 1

If (isPrime)
// It’s a prime number
Log Message: “The number " & numberToCheck & " is prime.”
Else
// It’s not a prime number
Log Message: “The number " & numberToCheck & " is not prime.”

Hope this Helps

[AJ_Ask]

Hi @Hallgrimur_Ingolfsson_HI

Take i=1 Then Take the input from the use save it in number variable

Checks if the number is divisible by i . If yes, increments the counter c

After the loop, checks if c is equal to 2, and logs the result prime or not prime

PrimeOrNot.zip (2.7 KB)

Hope this Helps

[Anil_G (Anil Gorthi)]

@Hallgrimur_Ingolfsson_HI

Use a if condition and ignore checking when the value is 0 or 1 as mod of 0 or 1 with any number will be 0

Cheers

[Hallgrimur_Ingolfsson_HI (Hallgrímur Ingólfsson - HI)]

Thanks Anil, problem solved.