72 lines
1.7 KiB
Java
72 lines
1.7 KiB
Java
import java.util.Scanner;
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class Number {
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private double value;
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public Number(double value) {
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this.value = value;
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}
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public boolean isZero() {
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return value == 0;
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}
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public boolean isPositive() {
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return value > 0;
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}
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public boolean isNegative() {
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return value < 0;
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}
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public boolean isOdd() {
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return (int) value % 2 != 0;
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}
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public boolean isEven() {
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// This is an explicit narrowing typecast from double to int
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return (int) value % 2 == 0;
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}
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public boolean isPrime() {
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if (value <= 1 || value != (int) value) return false;
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for (int i = 2; i <= Math.sqrt(value); i++) if (
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(int) value % i == 0
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) return false;
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return true;
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}
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public boolean isArmstrong() {
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if (value != (int) value) return false;
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int num = (int) value, sum = 0, digits = String.valueOf(num).length();
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for (int n = num; n > 0; n /= 10) sum += Math.pow(n % 10, digits);
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return sum == num;
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}
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public static void main(String[] args) {
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Scanner sc = new Scanner(System.in);
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System.out.print("Enter a number: ");
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Number number = new Number(sc.nextDouble());
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System.out.println(
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"Is Zero: " +
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number.isZero() +
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", Is Positive: " +
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number.isPositive() +
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", Is Negative: " +
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number.isNegative() +
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", Is Odd: " +
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number.isOdd() +
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", Is Even: " +
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number.isEven() +
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", Is Prime: " +
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number.isPrime() +
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", Is Armstrong: " +
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number.isArmstrong()
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);
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sc.close();
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}
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}
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