Exact division (whole)

Question

I need to make a division but that it always gives zero rest, exact division.
I think I’m sinning in condition.

Random Number;
int Rnumber1;
int Rnumber2;
RandomValor1 = (TextView) findViewById(R.id.TxtValor1);
RandomValor2 = (TextView) findViewById(R.id.TxtValor2);

Number = new Random();
Rnumber1 = Number.nextInt(20);
Rnumber2 = Number.nextInt(10);


while (Rnumber1/Rnumber2==0 ) {

    Rnumber1 = Number.nextInt(20);
    Rnumber2 = Number.nextInt(10);


}

RandomValor1.setText(Integer.toString(Rnumber1));
RandomValor2.setText(Integer.toString(Rnumber2));

Answer 1

To get the rest of the division of two numbers use the module operator %. See the following code:

while(valor1 % valor2 != 0) 

The condition at the top means that while the rest of the valor1 for valor2 is different from zero, do something.

Adaptation to your code:

while (Rnumber1 % Rnumber2 != 0) {

    Rnumber1 = Number.nextInt(20);
    Rnumber2 = Number.nextInt(10);
}

To ensure that Rnumber1 is greater than or equal to Rnumber2 changes the condition like this:

while (Rnumber1 < Rnumber2 || Rnumber1 % Rnumber2 != 0) {

    Rnumber1 = Number.nextInt(20);
    Rnumber2 = Number.nextInt(10);
}

---

From what I understand you have the following requirements:

1. The divisor shall be a number between 1 and 10
2. The dividend shall be a number <= to 20 and >= to the divisor.

The method Number.nextInt(x) generates numbers between 0 and x-1, thus, to ensure the first requirement the code will be so:

Rnumber2 = Number.nextInt(10) + 1;

To ensure the following requirement we will do so:

R.number1 = Number.nextInt(21 - Rnumber2) + Rnumber2;

The modified code will thus be:

Random Number;
int Rnumber1;
int Rnumber2;

Number = new Random();
RandomValor1 = (TextView) findViewById(R.id.TxtValor1);
RandomValor2 = (TextView) findViewById(R.id.TxtValor2);

do {
    Rnumber2 = Number.nextInt(10) + 1;
    Rnumber1 = Number.nextInt(20 - Rnumber2 + 1) + Rnumber2;
}while (Rnumber1 % Rnumber2 != 0)

RandomValor1.setText(Integer.toString(Rnumber1));
RandomValor2.setText(Integer.toString(Rnumber2));