REVIEW

a)

public class TemperatureConverter {
    public static void main(String [] args) {
        double f = 255.5;

        // Convert Fahrenheit to Celsius
        double c = (f - 32) * 5 / 9;

        // Print temperature in Celsius 
        System.out.println(f + " degree(s) Fahrenheit is equal to " + c + " degree(s) Celsius.");
    }
}

b) -9 4 2.00

c) This is a perfectly legal statement because the class name Math allows Java to distinguish between the variable sqrt and the method sqrt. 
However, we should avoid having multiple aspects of a program with the same name as it may cause confusion.

d) (Math.pow(x, 2) - (1 / (y + 3))) / ((1 / z) + Math.sqrt(x))

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1) val = stdin.nextInt();

2) eurasiaSales = Arithmetic.add(euroSales,asiaSales);

3) pricePerCase * 12

4) y = ((9 * Math.pow(x,3)) - (27 * Math.pow(x,2)) - (4 * x) + 12)/(Math.sqrt((3 * Math.pow(x,2)) + 1) + (Math.abs(5 - Math.pow(x,4))))

5) 

import java.util.Scanner;

public class CitiesComparison {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        String city1, city2;
        int distance;
        double costPerMile;
        int dollarAmount;
        System.out.print("Enter the starting city: ");
        city1 = in.next();
        System.out.print("Enter the ending city: ");
        city2 = in.next();
        System.out.print("Enter distance in miles between cities: ");
        distance = in.nextInt();
        System.out.print("Enter the cost of travel per mile: ");
        costPerMile = in.nextDouble();
        dollarAmount = (int) (distance * costPerMile);
        System.out.println("\n\nThe cost of traveling from "
                + city1 + " to " + city2 + " is $" + dollarAmount);
    }
}

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6) 

import java.util.Scanner;

public class SecondsConversion {
    public static void main (String [] args){
        //prompt the user for input
        Scanner sc = new Scanner(System.in);
        System.out.print("Enter number of seconds: ");
        int totalSeconds = sc.nextInt();
       
        //measurement constants
        final int SEC_PER_MIN = 60;
        final int MIN_PER_HR = 60;
        final int SEC_PER_HR = SEC_PER_MIN * MIN_PER_HR; //3600
       
        //convert
        int hours = totalSeconds / SEC_PER_HR;
        int remSeconds = totalSeconds % SEC_PER_HR; //not enough to make a full hr
        int minutes = remSeconds / 60;
        int seconds = remSeconds % 60; //not enough to make a full min
       
        System.out.print(totalSeconds + " seconds = ");
        System.out.printf("%d hours, %d minutes, %d seconds%n", hours, minutes, seconds);

				sc.close();
    }
}

7) 

public class RandomFile {
    public static void main(String[] args) throws Exception{
        //read in user's name
        Scanner input = new Scanner(System.in);
        System.out.print("Enter first name: ");
        String firstName = input.next();
        System.out.print("Enter last name: ");
        String lastName = input.next();
        String filename = lastName+"_"+firstName+"_Info.txt";
       
       
        //generate ID number
        int min = 1000; //inclusive
        int max = 10000; //exclusive
        int id = (int) (Math.random() * (max - min) + min);
       
        //write info to file
       
        PrintWriter pw = new PrintWriter (filename);
        pw.print(id);
        pw.close();
       
        //read file content to the console
       
        System.out.print("Enter first name to search for: ");
        String firstName2 = input.next();
        System.out.print("Enter last name to search for: ");
        String lastName2 = input.next();
        input.close();
        String filename2 = lastName2+"_"+firstName2+"_Info.txt";
        File f = new File(filename2);
        Scanner sc = new Scanner(f);
        System.out.println("User: " + firstName2 + ", " + lastName2);
        int userID = sc.nextInt();
        System.out.println("ID Number: " + userID);
        sc.close();
    }
}

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LAB 1 TO BE DISCUSSED IN CLASS

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