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- import java.util.Scanner;
- public class Nums100 {
- public static void main(String[] args) {
- Scanner scanner = new Scanner(System.in);
- String figType = scanner.nextLine();
- double area = 0;
- switch (figType) {
- case "square": {
- double a = Double.parseDouble(scanner.nextLine());
- area = a * a;
- break;
- }
- case "rectangle": {
- double a = Double.parseDouble(scanner.nextLine());
- double b = Double.parseDouble(scanner.nextLine());
- area = a * b;
- break;
- }
- case "circle": {
- double r = Double.parseDouble(scanner.nextLine());
- area = Math.PI * r * r;
- break;
- }
- case "triangle": {
- double side = Double.parseDouble(scanner.nextLine());
- double height = Double.parseDouble(scanner.nextLine());
- area = (side * height)/2;
- break;
- }
- }
- System.out.printf("%.3f", area);
- }
- }
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