Question

Write a program that displays the following pattern: Write a program that displays the following table: Assume a runner runs 14 kilometers in 45 minutes and 30 seconds. Write a program that displays the average speed in miles per hour. (Note that 1 mile is 1.6 kilometers) The U.S. Census Bureau projects population based on the following assumptions: One birth every 7 seconds One death every 13 seconds One new immigrant every 45 seconds Write a program to display the population for each of the next five years. Assume the current population is 312, 032, 486 and one year has 365 days.

Answer 1

Exercise 01_03:

public class Exercise01_03 {
    public static void main(String args[])
    {
        //Printing to form the pattern
        System.out.println("    J     A     V     V     A");
        System.out.println("    J    A A     V   V     A A");
        System.out.println("J   J   AAAAA     V V     AAAAA");
        System.out.println(" J J   A     A     V     A     A");
    }
}

Output:

Exercise 01_04:

public class Exercise01_04 {
    public static void main(String args[])
    {
        int a;
        System.out.println("a      a^2    a^3");
        for(a = 1; a <= 4; a++)//Displaying a, a^2, a^3
            System.out.println(String.format("%s %8s %6s", a, (int)Math.pow(a, 2), (int)Math.pow(a, 3))); //Math.pow(a, 2) raises a to the power of 2
        //(int) converts data to integer type
    }
}

Output:

Exercise 01_10:

public class Exercise01_10 {
    public static void main(String args[]){
        int minutes = 45, seconds = 30;
        double distance = 14.0, dist_In_1_hr, dist_In_miles;
        seconds += minutes * 60; //Calculating total seconds
        dist_In_1_hr = 3600 * distance / seconds; //Distance in km in one hour
        dist_In_miles = dist_In_1_hr / 1.6; //distance in miles
        System.out.println(String.format("The average speed in miles = %.2f mph.", dist_In_miles));
    }
}

Output:

Output-Exercise01 (run) ル The average speed in miles 11.54 mph BUILD SUCCESSFUL (total time: 0 seconds)

Exercise 01_11:

public class Exercise01_11 {
    public static void main(String args[]){
        int i;
        double births, deaths, immigrants, final_popu = 312032486.0, popu;
        births = (365 * 24 * 3600) / 7.0; //Total births in a year
        deaths = (365 * 24 * 3600) / 13.0; //Total deaths in a year
        immigrants = (365 * 24 * 3600) / 45.0; //Total immigrants in a year
        popu = births + immigrants - deaths; //Population increase in a year
        for(i = 1; i <= 5; i++)
        {
            final_popu += popu; //Population at the end of each year
            System.out.println("Year " + i + ": " + (long)Math.ceil(final_popu)); //Population comes in whole number
            //Converting to long to display as whole number
            //Taking ceiling value of the population
        }
    }
}

Output:

Output-Exercise01 (run) x Year 1: 314812583 Year 2: 317592680 Year 3: 320372777 Year 4 323152873 Year 5 325932970 BUILD SUCCESSFUL (total time: 0 seconds)