Question

Problem 4: Write a Java program that reads positive integers, find the largest of them, count its occurrences and print out the average of all input integers up to two decimal places (小數 點第二位). Use the characters·Q' or'q, to end the input. Below are two sample runs: Enter an integer, or quit with Q or q:1 Enter an integer, or quit with Q or q: 2 Enter an integer, or quit with Q or q: 3 Enter an integer, or quit with Q or q: q The largest number is 3 The count for the Largest number is 1 The average is 2.00 Enter an integer, or quit with Q or q: 3 Enter an integer, or quit with Q or q: 5 Enter an integer, or quit with Q or q 2 Enter an integer, or quit with Q or q: 5 Enter an integer, or quit with Q or q: 5 Enter an integer, or quit with Q or q: 5 Enter an integer, or quit with Q or q: Q The largest number is 5 The count for the largest number is 4 The average is 4.17

Answer 1

import java.text.DecimalFormat;
import java.util.Objects;
import java.util.Scanner;

public class Main {

  
public static void main(String args[]) {
  
double avg; //average
int count =0; //count of largest no
int largest=-1; //largest no
int total = 0; //total input numbers
int sum = 0; //sum of all numbers

while(true) {
System.out.print("Enter an integer, or quit with Q or q: ");
Scanner sc = new Scanner(System.in);
if(sc.hasNextInt()){
int num = sc.nextInt();
total++;
sum = sum + num; //calculate sum of all numbers
if(num>largest) {
largest = num; //got largest no
count = 1;
} else if(num == largest) {
count++; //increase count of largest no.
}
} else {
String input = sc.nextLine();
if(Objects.equals(input, "q")||Objects.equals(input, "Q")){ //check if q/Q is there
break;
}
}
}
System.out.println("The largest number is: " + largest);
System.out.println("The count for the largest number is: " + count);
avg = (double)sum/total;
DecimalFormat d = new DecimalFormat("#0.00"); //avg upto 2 decimal places1
System.out.println("The average is: " + d.format(avg));
  
}
}


Enter an integer, or quit with 2 or q 1 Enter an integer, or quit with 2 or q 2 Enter an integer, or quit with 2 or q 3 Enter an integer, or quit with o The largest number is: 3 The count for the largest number is: 1 The average is: 2.00 BUILD SUCCESSFUL (total tim 16 seconds) or q: q

Enter an integer, or quit with 2 or q 3 Enter an integer, or quit with 2 or q 5 Enter an integer, or quit with 2 or q 2 Enter an integer, or quit with 2 or q 5 Enter an integer, or quit with 2 or q 5 Enter an integer, or quit with 2 or q 5 Enter an integer, or quit with 2 or q: 2 The largest number is: 5 The count for the largest number is 4 The average is: 4.17 BUILD SUCCESSFUL (total time: 13 seconds)