Answered: import java.util.Scanner; public class…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

import java.util.Scanner;

public class LabProgram {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);

int n = sc.nextInt();
// Validating the input
if(n >= 20 && n <= 98) {
// Running the countdown
while(true) {
System.out.print(n + " "); // Displaying the current value of the countdown
// If the digits are the same,
if(areDigitsIdentical(n)) {
break; // Breaking out from the loop
}
// Decreasing the value of the countdown
n--;
System.out.println("");
}
} else {
System.out.println("Input must be 20-98"); // Displaying the appropriate message for InValid Input
}
}

public static boolean areDigitsIdentical(int n) {
int d0 = n % 10; // Extracting out the 1st digit
int d1 = n / 10; // Extracting out the 2nd digit
// If the two digits are the same,
if(d0 == d1)
return true; // Return true
else // Otherwise,
return false; // Return false
}
}

The language is Java. The output has to print a space after each number including the last one (The pictures shown is what the code needs to print as well as what the code above prints)

Input
93
93
92 -
91 -
Your output
90 -
89 -
88
Expected out
93 92 91 90 89 88 e
2: Compare output ^
Output is nearly correct; but whitespace differs. See highlights below.
Special character legend
Input
77
Your output
77
Expected output
77 -

Input
20
20
19
18
17
16 -
Your output
15
14
13
12 +
11
Expected output
20 19 18 17 16 15 14 13 12 11
4: Compare output a
Input
99
Your output
Input must be 20-98
5: Compare output a
Input
19
Your output
Input must be 20-98

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