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- import java.sql.SQLOutput;
- import java.util.Scanner;
- public class Calculator {
- public static void main(String[] args) {
- printToScreen("Старт программы", true);
- String numberOne = enterNum();
- String numberTwo = enterNum();
- printToScreen("Принял: ", false);
- printToScreen(numberOne, true);
- printToScreen("Принял: ", false);
- printToScreen (numberTwo, true);
- int firstNum = stringToInteger(numberOne);
- int secondNum = stringToInteger(numberTwo);
- int thirdNum = calcDifference(firstNum, secondNum);
- printToScreen("Результат: ", false);
- printToScreen(String.valueOf(thirdNum), true);
- printToScreen("Конец программы", false);
- }
- public static String enterNum() {
- Scanner scanner = new Scanner(System.in);
- printToScreen("Введите число:",false);
- String number= scanner.nextLine();
- if (checkString(number)){
- return number;}
- else { enterNum();return number;
- }
- }
- public static int stringToInteger(String stringData) {
- return Integer.parseInt(stringData);
- }
- public static int calcDifference(int firstNumber, int secondNumber) {
- printToScreen("Начинаю считать", true);
- return firstNumber - secondNumber;
- }
- public static void printToScreen(String abraCadaBra, boolean addNewLine) {
- if (addNewLine) {
- System.out.println(abraCadaBra);
- } else {
- System.out.print(abraCadaBra);
- }
- }
- public static boolean checkString(String string) {
- try {
- Integer.parseInt(string);
- return true;
- } catch (IllegalArgumentException e){
- return false;}
- }
- }
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