[Solved] sort way to find prime number but it have some error#? [duplicate]

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You have issues in your second loop, I don’t get the why you used the variable tongchiahet, The main thing that you have to use is a break statement, which helps you to stop iteration of second loop if so % chia == 0 in between iterations: Here is a working Example for you, And try the following code:

int limit = 20;
for (var so = 1; so < limit; so++)
{
    bool isPrime = false;
    for (var chia = 2; chia < so; chia++)
    {
        if (so % chia == 0)
        {
            isPrime = true;
            break;
        }
    }
    if (!isPrime)
        Console.WriteLine(so);

}

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solved sort way to find prime number but it have some error#? [duplicate]