123 lines
2.6 KiB
Java
123 lines
2.6 KiB
Java
package uebung02.rationals;
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public class Rational {
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private final int num, denom;
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Rational(int num, int denom) {
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if (denom == 0) {
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throw new IllegalArgumentException("Zahl darf nicht 0 sein!");
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} else {
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int gcd = gcDivider(num, denom);
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if (denom < 0) {
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this.num = -num / gcd;
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this.denom = -denom / gcd;
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} else {
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this.num = num / gcd;
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this.denom = denom / gcd;
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}
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}
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}
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Rational (int num) {
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this(num, 1);
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}
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private int gcDivider(int x, int y) {
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//return x == 0 ? y : gcDivider(y % x, x);
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if (x == 0) {
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return y;
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} else {
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return gcDivider(y % x, x);
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}
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}
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public int getNum() {
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return num;
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}
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public int getDenom() {
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return denom;
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}
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public Rational add(Rational other) {
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return new Rational(num * other.getDenom() + denom * other.getNum(),
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denom * other.getDenom());
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}
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public Rational add(int i) {
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return add(new Rational(i));
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}
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public Rational sub(Rational r) {
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return new Rational(num * r.denom - denom * r.num, denom * r.denom);
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}
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public Rational sub(int i) {
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return this.sub(new Rational(i));
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}
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public Rational mult(Rational r) {
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return new Rational(num * r.num, denom * r.denom);
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}
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public Rational mult(int i) {
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return mult(new Rational(i));
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}
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public Rational div(Rational r) {
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return new Rational(num * r.denom, denom * r.num);
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}
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public Rational div(int i) {
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return div(new Rational(i));
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}
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@Override
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public String toString() {
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if (denom == 1) {
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return "" + num;
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} else {
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return num + "/" + denom;
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}
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}
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public boolean lessThan(Rational r) {
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return this.sub(r).num < 0;
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}
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public boolean lessThan(int i) {
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return this.sub(i).num < 0;
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}
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public boolean greaterThan(Rational r) {
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return this.sub(r).num > 0;
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}
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public boolean greaterThan(int i) {
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return this.sub(i).num > 0;
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}
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public boolean lessThanOrEqual(Rational r) {
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return this.sub(r).num <= 0;
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}
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public boolean lessThanOrEqual(int i) {
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return this.sub(i).num <= 0;
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}
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public boolean greaterThanOrEqual(Rational r) {
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return this.sub(r).num >= 0;
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}
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public boolean isEqual(Rational r) {
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return this.num == r.num && this.denom == r.denom;
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}
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public boolean isEqual(int i) {
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return this.isEqual(new Rational(i));
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}
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}
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