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IntDivider.java
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IntDivider.java
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package by.andd3dfx.numeric;
import java.util.ArrayDeque;
import java.util.Deque;
/**
* Реализовать вручную функцию целочисленного деления int divide(int a, int b)
*
* @see <a href="https://youtu.be/jhKuxPDCa54">Video solution</a>
*/
public class IntDivider {
public static int divide(int a, int b) {
if (b == 1) {
return a;
}
var counter = 0;
while (a >= b) {
a -= b;
counter++;
}
return counter;
}
public static int divideOptimized(int a, int b) {
int remains = a;
int counter = 0;
int power = 1;
Deque<Integer> stack = new ArrayDeque<>();
stack.push(power);
int iterationsAmount = 0;
while (remains >= b) {
if (remains >= power * b) {
remains -= power * b;
counter += power;
stack.push(power);
power *= 2;
} else {
power = stack.pop();
}
iterationsAmount++;
}
System.out.println(String.format("Division: %d/%d=%d. Iterations performed: %d", a, b, counter, iterationsAmount));
return counter;
}
}