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/*
* Copyright 2015 ARM Limited
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
import java.lang.System;
import java.math.BigInteger;
class MyLong {
private long value;
public MyLong(long value) {
this.value = value;
}
public long get() {
return value;
}
public void set(long newValue) {
value = newValue;
}
public int compareTo(MyLong other) {
if (value > other.value)
return 1;
if (value == other.value)
return 0;
return -1;
}
}
public class ObjFactorial {
public static void timeBigFact(int iters) {
BigInteger bigOne = new BigInteger("1");
BigInteger bigInput = new BigInteger("20");
BigInteger bigResult = bigOne;
for (int x = 0; x < iters; x++) {
bigResult = bigOne;
for (BigInteger i = bigOne; i.compareTo(bigInput) == -1; i = i.add(bigOne)) {
bigResult = bigResult.multiply(i);
}
}
}
public static void timeMyFact(int iters) {
MyLong myInput = new MyLong(20);
MyLong myResult = new MyLong(1);
for (int x = 0; x < iters; x++) {
myResult = new MyLong(1);
for (MyLong i = new MyLong(1); i.compareTo(myInput) == -1; i.set(i.get() + 1)) {
myResult.set(myResult.get() * i.get());
}
}
}
public static void main(String[] args) {
final int ITERATIONS_BIG = 1000;
final int ITERATIONS_MY = 100000;
long before = System.currentTimeMillis();
timeBigFact(ITERATIONS_BIG);
long after = System.currentTimeMillis();
System.out.println("bigFact: " + (after - before));
before = System.currentTimeMillis();
timeMyFact(ITERATIONS_MY);
after = System.currentTimeMillis();
System.out.println("myFact: " + (after - before));
}
}
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