Write a RainFall class that stores the total rainfall for each of 12 months into an array of doubles. The program should have me
1 answer:
Answer:
Explanation:
The code provided worked for the most part, it had some gramatical errors in when printing out the information as well as repeated values. I fixed and reorganized the printed information so that it is well formatted. The only thing that was missing from the code was the input validation to make sure that no negative values were passed. I added this within the getMonths() method so that it repeats the question until the user inputs a valid value. The program was tested and the output can be seen in the attached image below.
import java.io.*;
import java.util.*;
class Rainfall
{
Scanner in = new Scanner(System.in);
private int month = 12;
private double total = 0;
private double average;
private double standard_deviation;
private double largest;
private double smallest;
private double months[];
public Rainfall()
{
months = new double[12];
}
public void setMonths()
{
for(int n=1; n <= month; n++)
{
int answer = 0;
while (true) {
System.out.println("Enter the rainfall (in inches) for month #" + n + ":" );
answer = in.nextInt();
if (answer > 0) {
months[n-1] = answer;
break;
}
}
}
}
public void getTotal()
{
total = 0;
for(int i = 0; i < 12; i++)
{
total = total + months[i];
}
System.out.println("The total rainfall for the year is " + total);
}
public void getAverage()
{
average = total/12;
System.out.println("The average monthly rainfall is " + average);
}
public void getLargest()
{
double largest = 0;
int largeind = 0;
for(int i = 0; i < 12; i++)
{
if (months[i] > largest)
{
largest = months[i];
largeind = i;
}
}
System.out.println("The largest amount of rainfall was " + largest +
" inches in month " + (largeind + 1));
}
public void getSmallest()
{
double smallest = Double.MAX_VALUE;
int smallind = 0;
for(int n = 0; n < month; n++)
{
if (months[n] < smallest)
{
smallest = months[n];
smallind = n;
}
}
System.out.println("The smallest amount of rainfall was " + smallest +
" inches in month " + (smallind + 1));
}
public static void main(String[] args)
{
Rainfall r = new Rainfall();
r.setMonths();
r.getTotal();
r.getSmallest();
r.getLargest();
r.getAverage();
}
}
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Answer:
Here is the JAVA program:
import java.util.InputMismatchException; // exception that is thrown when input does not match the expected type
import java.util.Scanner; //used to take input from user
public class Main {
public static void main(String[] args) { //start of main function
Scanner input = new Scanner(System.in); // creates Scanner class object
double num1=0.0; // double type operand 1
double num2=0.0; // double type operand 2
System.out.println("Please enter 2 operands"); //prompts user to enter two operands
try { //defines a chunk of code to be tested for non numeric operand error
num1 = input.nextDouble(); //reads operand 1 value
num2 = input.nextDouble(); //reads operand 2 value
} catch (InputMismatchException ex) { //code chunk executed when exception occurs in program
System.out.println("wrong operand type, re-input " + input.next() + " to finish the calculation."); //displays wrong operand type if user enters non numeric operands
System.exit(1); }//exits the program
System.out.print("Enter an operator (+, -, *, /): "); //prompts user to enter an operator
char operator = input.next().charAt(0); //reads the input operator
double result; // to store the result of the operation
switch(operator) { //decided operation on basis of input operator
case '+': // if user enters + operator
result = num1 + num2; //adds two operands
break;
case '-': // if user enters - operator
result = num1 - num2; //subtracts two operands
break;
case '*': // if user enters * operator
result = num1 * num2; //multiplies two operands
break;
case '/': // if user enters / operator
result = num1 / num2; //divided two operands
break;
default: //if user enters wrong operator
System.out.printf("wrong operator!"); //displays wrong operator
return; }
System.out.printf("%.1f %c %.1f = %.1f", num1, operator, num2, result); }} //displays the result of the operation
Explanation:
The program is well explained in the comments mentioned with each line of program. The user is prompted to enter the values of two operands num1 and num2. The try block is used to test for non numeric operand error and throws InputMismatchException when any of the input operands (num1 or num2) is non numeric. InputMismatchException is thrown by Scanner class. This informs that the token retrieved (which is the num1 or num2 operand) does not match the expected type (which is type numeric). When this error occurs in the program, catch block is used to execute a code chunk, which is the print statement in this program. The print statement informs the user of the wrong operand type before exiting. It also asks the user to re-input the number to finish the calculation and the wrong input type is also mentioned in the output that is to be re-input.
If you want the program to take the input again from user after throwing this exception then you can alter the above program by using two try catch blocks separately for the two operands:
//for operand 1 i.e. num1
System.out.println("Please enter operand 1: ");
try {
num1 = input.nextDouble();
} catch (InputMismatchException ex) {
System.out.println("wrong operand type, re-input " + input.next() + " to finish the calculation.");
num1 = input.nextDouble(); } //reads input of operand 1 again from user
//for operand 2 i.e. num2
System.out.println("Please enter operand 2: ");
try {
num2 = input.nextDouble();
} catch (InputMismatchException ex) {
System.out.println("wrong operand type, re-input " + input.next() + " to finish the calculation.");
num2 = input.nextDouble(); } //reads input of operand 1 again from user
The program and its output is attached.
