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Thursday, 25 August 2016

Chapter 7 Exercise 17, Introduction to Java Programming, Tenth Edition Y. Daniel LiangY.

**7.17 (Sort students) Write a program that prompts the user to enter the number of students, the students’ names, and their scores, and prints student names in decreasing order of their scores.



import java.util.Scanner;
 
 
public class ProgrammingEx7_17 {
 
 public static void main(String[] args) {
 
  Scanner input = new Scanner(System.in);
  System.out.print("Enter the number of students:");
 
  int n = input.nextInt();
  double[] score = new double[n];
  String[] names = new String[n];
 
  System.out.println("Enter student names and score:");
 
  for (int i = 0; i < score.length; i++) {
   names[i] = input.next();
   score[i] = input.nextDouble();
  }
  selectionSort(score, names);
   
  System.out.println("Student names and scores in decreasing order:");
  for (int i = names.length - 1; i >= 0; i--) {
   System.out.println(names[i] + ":" + score[i]);
  }
 
 }
 
 public static void selectionSort(double[] list, String[] names) {
 
  for (int i = 0; i < list.length - 1; i++) {
   // Find the minimum in the list[i..list.length-1]
   double currentMin = list[i];
   int currentMinIndex = i;
 
   for (int j = i + 1; j < list.length; j++) {
    if (currentMin > list[j]) {
     currentMin = list[j];
     currentMinIndex = j;
    }
   }
 
   // Swap list[i] with list[currentMinIndex] if necessary
   if (currentMinIndex != i) {
    list[currentMinIndex] = list[i];
    list[i] = currentMin;
    // Swap names
    String temp = names[currentMinIndex];
    names[currentMinIndex] = names[i];
    names[i] = temp;
 
   }
  }
 }
 
}

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