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java lab2 improvements

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jacekpoz 2024-04-12 10:21:55 +02:00
parent b217f2f5b8
commit 2f61515fb7
Signed by: poz
SSH key fingerprint: SHA256:JyLeVWE4bF3tDnFeUpUaJsPsNlJyBldDGV/dIKSLyN8
2 changed files with 49 additions and 13 deletions
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53
lab2/zad2/app/src/main/java/pl/jacekpoz/GF.java
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@ -15,19 +15,19 @@ public class GF {
this.value = value; this.value = value;
} }
public GF addition(final GF rhs) throws IllegalArgumentException { public GF add(final GF rhs) throws IllegalArgumentException {
verifyCharacteristics(this, rhs); verifyCharacteristics(this, rhs);
return new GF((this.value + rhs.value) % this.characteristic, this.characteristic); return new GF((this.value + rhs.value) % this.characteristic, this.characteristic);
} }
public void additionAssignment(final GF rhs) throws IllegalArgumentException { public void addAssign(final GF rhs) throws IllegalArgumentException {
verifyCharacteristics(this, rhs); verifyCharacteristics(this, rhs);
this.value = this.addition(rhs).value; this.value = this.add(rhs).value;
} }
public GF subtraction(final GF rhs) throws IllegalArgumentException { public GF subtract(final GF rhs) throws IllegalArgumentException {
verifyCharacteristics(this, rhs); verifyCharacteristics(this, rhs);
if (this.value < rhs.value) { if (this.value < rhs.value) {
return new GF(this.characteristic - (rhs.value - this.value), this.characteristic); return new GF(this.characteristic - (rhs.value - this.value), this.characteristic);
@ -35,40 +35,55 @@ public class GF {
return new GF((this.value - rhs.value), this.characteristic); return new GF((this.value - rhs.value), this.characteristic);
} }
public void subtractionAssignment(final GF rhs) throws IllegalArgumentException { public void subtractAssign(final GF rhs) throws IllegalArgumentException {
verifyCharacteristics(this, rhs); verifyCharacteristics(this, rhs);
this.value = this.subtraction(rhs).value; this.value = this.subtract(rhs).value;
} }
public GF multiplication(final GF rhs) throws IllegalArgumentException { public GF multiply(final GF rhs) throws IllegalArgumentException {
verifyCharacteristics(this, rhs); verifyCharacteristics(this, rhs);
return new GF((this.value * rhs.value) % this.characteristic, this.characteristic); return new GF((this.value * rhs.value) % this.characteristic, this.characteristic);
} }
public void multiplicationAssignment(final GF rhs) throws IllegalArgumentException { public void multiplyAssign(final GF rhs) throws IllegalArgumentException {
verifyCharacteristics(this, rhs); verifyCharacteristics(this, rhs);
this.value = this.multiplication(rhs).value; this.value = this.multiply(rhs).value;
} }
public GF division(final GF rhs) throws IllegalArgumentException { public GF divide(final GF rhs) throws IllegalArgumentException {
verifyCharacteristics(this, rhs); verifyCharacteristics(this, rhs);
if (rhs.value == 0) {
throw new IllegalArgumentException("division by 0 is illegal");
}
return new GF((this.value / rhs.value) % this.characteristic, this.characteristic); int inverse = 1;
for (int i = 1; i < this.characteristic; i++) {
if ((rhs.value * i) % this.characteristic == 1) {
inverse = i;
break;
}
}
return new GF((this.value * inverse) % this.characteristic, this.characteristic);
} }
public void divisionAssignment(final GF rhs) throws IllegalArgumentException { public void divideAssign(final GF rhs) throws IllegalArgumentException {
verifyCharacteristics(this, rhs); verifyCharacteristics(this, rhs);
this.value = this.division(rhs).value; this.value = this.divide(rhs).value;
} }
public int getCharacteristic() { public int getCharacteristic() {
return this.characteristic; return this.characteristic;
} }
public int getValue() {
return this.value;
}
@Override @Override
public boolean equals(Object obj) { public boolean equals(Object obj) {
if (obj instanceof GF rhs) { if (obj instanceof GF rhs) {
@ -82,6 +97,18 @@ public class GF {
return false; return false;
} }
public int compare(GF rhs) throws IllegalArgumentException {
verifyCharacteristics(this, rhs);
if (this.value < rhs.value) {
return -1;
} else if (this.value > rhs.value) {
return 1;
} else {
return 0;
}
}
@Override @Override
public String toString() { public String toString() {
return "GF<" + this.characteristic + ">(" + this.value + ")"; return "GF<" + this.characteristic + ">(" + this.value + ")";

9
lab2/zad2/app/src/main/java/pl/jacekpoz/Main.java
View file

@ -1,6 +1,15 @@
package pl.jacekpoz; package pl.jacekpoz;
import java.util.Scanner;
public class Main { public class Main {
public static void main(String[] args) { public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
GF a = new GF(1234577, scanner.nextInt());
GF b = new GF(1234577, scanner.nextInt());
System.out.println(a + " + " + b + " = " + (a.add(b)));
System.out.println(a + " - " + b + " = " + (a.subtract(b)));
System.out.println(a + " * " + b + " = " + (a.multiply(b)));
System.out.println(a + " / " + b + " = " + (a.divide(b)));
} }
} }