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- import java.util.Scanner;
- public class Multicalculator {
- public static void main(String[] args) {
- String numString = enterNum();
- int countNum = stringToInteger(numString);
- System.out.println("Enter " + countNum + " numbers:");
- int[] numbers = new int[countNum];
- for (int i = 0; i < countNum; i++) {
- System.out.println("Enter a number:");
- Scanner scanner = new Scanner(System.in);
- String someNumbers = scanner.nextLine();
- boolean isItNum = checkString(someNumbers);
- while (!isItNum) {
- System.out.println("Please, enter a number:");
- someNumbers = scanner.nextLine();
- isItNum = checkString(someNumbers);
- while (!isItNum) {
- System.out.println("Please, enter a number:");
- someNumbers = scanner.nextLine();
- isItNum = checkString(someNumbers);
- }
- numbers[i] = stringToInteger(someNumbers);
- }
- }
- }
- public static String enterNum() {
- Scanner scanner = new Scanner(System.in);
- System.out.println("How many numbers would you like to enter?");
- String numString = scanner.nextLine();
- boolean isItNum = checkString(numString);
- while (!isItNum) {
- System.out.println("Please, enter a number:");
- numString = scanner.nextLine();
- isItNum = checkString(numString);
- }
- return numString;
- }
- public static int stringToInteger(String numbers) {
- return Integer.parseInt(numbers);
- }
- public static boolean checkString(String string) {
- try {
- Integer.parseInt(string);
- return true;
- } catch (IllegalArgumentException e) {
- return false;
- }
- }
- }
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