Database System Concepts
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ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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**** JAVA ****
Transcribed Image Text:Exercise 1
Write a recursive method for countdown. For example, if
the user enters 10, the method should perform the
countdown starting from 10 to 0.
• Write the code in a single .java file named Ex1Lab07.java
which should also contain the main method for testing.
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- ForLoops.java 1 /** * Given two integers, the second larger than the first, this program: 1) prints the even numbers between the first and second number inclusive 2) prints the sum of those even numbers 3) prints the odd numbers between the first and second number inclusive 4) prints the sum of those odd numbers 3 4 6. 7 * * Example: Enter an integer: 10 Enter one larger than the first: 20 8. 9. * 10 * 11 Even numbers: 10 12 14 16 18 20 12 Sum of even numbers 90 13 Odd numbers: 11 13 15 17 19 14 Sum of odd numbers 75 %D 15 16 * This version uses FOR loops. 17 * 18 */ 19 import java.util.Scanner; public class ForLoops 21 { 20 public static void main(String[] args) { 22 23 24 Scanner in new Scanner(System.in); 25 26 System.out.print("Enter an integer: "); int firstNum = in.nextInt(); System.out. print("Enter one larger than the first: "); int secondNum = in.nextInt(); 27 28 29 30 // Complete the program } 31 32 33arrow_forward/***************************************************************************** * Online C Compiler.Code, Compile, Run and Debug C program online. Write your code in this editor and press "Run" button to compile and execute it. ****************************************************************************** */ #include <stdio.h> int main() {int e=1; while(e) { int n;puts("please enter a positive integer value (betweenn 1 and 7, inclusive)"); scanf("%d",&n);if (n>7)puts("Invalid input");else if (n<=0)puts("Invalid input");else{ long fact=1; float sum=0; int i=1; while (i<=n) {fact=fact*(i+1); sum= sum +(1.0/fact); if (i<n) printf("1/%ld+",fact); else printf("1/%ld=",fact); i++; } printf("%.3f\n",sum); } puts("Do you want to try again? 1/yes, 0/no"); int answer;scanf("%d",&answer);if (answer==0) e=0; } puts("Goodbye!"); return 0; }arrow_forwardJAVA PROGRAM ASAP ************* THE PROGRAM MUST WORK IN HYPERGRADE AND PASS ALL THE TEST CASES.**************** Chapter 16. PC #5. Palindrome Detector (page 1073) A palindrome is any word, phrase, or sentence that reads the same forward and backward. Here are some well-known palindromes: Able was I, ere I saw Elba A man, a plan, a canal, Panama Desserts, I stressed Kayak Write a boolean method that uses recursion to determine whether a String argument is a palindrome. The method should return true if the argument reads the same forward and backward. Demonstrate the method in a program. The program should ask the user to enter a string, which is checked for palindrome property. The program displays whether the given input is a palindrome or not, then prompts the user to enter another string. If the user enters QUIT (case insensitive, then exit the program). Test Case 1 Please enter a string to test for palindrome or type QUIT to exit:\nDesserts, I…arrow_forward
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