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Hello, how can I set my WPF Application with random generator number for division without residue? I try to create a math game in which the user chooses the math operation he wants to calculate, then he chooses what level he wants. Addition, subtraction and multiplication are not a problem. The problem occurs during division.
I would like to see only numbers that have no remainder after division. I created the code shown below.

I would like to see only single-digit numbers that would be divided and the result must not be with the residue.
firstNumber would be: 1,2,3,4,5,6,7,8,9
secondNumber would be: 1(divides all),2(divides 2,4,6,8),3(divides 3,6,9),4(divides 4,8)
Wouldn't there be a more sophisticated solution?

What I have tried:

int maxValue = 10;
Random number = new Random();
int total = 0;
int firstNumber = number.Next(1, maxValue);
int secondNumber = number.Next(1, maxValue);
if (firstNumber < secondNumber)
secondNumber = number.Next(1, firstNumber);
int residue = (firstNumber % secondNumber);
if (residue != 0)
firstNumber = firstNumber + 1;
total = firstNumber / secondNumber;

I would like the values ​​to be single digits. This code still does not guarantee me without erroneous calculations.

Thank you for any advice
Updated 20-May-21 6:42am
Richard MacCutchan 20-May-21 7:02am    
You have updated your question (still a number of typos in the code) but it is still not clear what result(s) you want.
Member 15170612 20-May-21 7:40am    
better now?
Richard MacCutchan 20-May-21 7:57am    
Sorry, no. What exactly are you trying to create?
Member 15170612 20-May-21 8:11am    
another try, i don't know how to explain it more
Richard MacCutchan 20-May-21 8:35am    
OK, I think i understand. So once you have the first number, you want a second number that will be divided exactly into the first, i.e. no remainder. The only way to guarantee that would be to use a loop, which checks every number up to the value of the first number. Something like:
for (secondNumber = 2; secondNumber <= firstNumber; secondNumber++)
    if (firstNumber % secondNumber == 0)
// second is now the selected value

I think you should start both sequences at 2 rather than 1.

A very approach is by construction:
  • Randomly generate the second (integer) number, say n2.
  • Randomly generate an integer factor, say f.
  • Let the first number, say n1, be equal to second number multiplied by the factor f (namely n1 = n2 * f)
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Member 15170612 4-May-21 4:30am    
is there any way to ensure that the first and second numbers are single digits?
CPallini 4-May-21 4:48am    
Of course there is (maybe changing drastically the approach) but then, you have a very little freedom (1 divides all {1..9} range, 2 divides only {2,4,6,8}, 3 divides only {3,6,9}, 4 divides only {4,8}, all the other single digit numbers just divide themselves).
Member 15170612 4-May-21 4:56am    
when I set the factor to 1, the division result will always be one, so I would somehow like to combine it
How can I set division without residue?

A division is:
dividend / divisor = quotient
Draw divisor and quotient, and multiply them to deduce the dividend.
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