COMP90041 Programming and Software Development
Workshop Instructions
Introduction to Java programming
1.Write a program that reads two floating point numbers and print their sum, difference, and product.
2.Write a program that reads the radius of a sphere and prints its volume and surface area. Use the following formulas, where r represents the radius:
! "
(a) Volume = "𝜋𝑟
(b) Surface Area = 4𝜋𝑟#
3. Write a program that calculates the total wages based on the number of hours worked. The wages are calculated at a rate of 8.25 per hour for hours less than 40 and at the rate of 1.5 the standard rate for any hours greater than 40. Number of hours is a command line argument to the program.
1. Hints for Problem 1:
• program syntax public class FloatPointCalculation { public static void main (String[] args) {
}
}
• reading from keyboard import java.util.Scanner;
Scanner scanner = new Scanner(System.in);
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• float point numbers float numberA; float numberB;
2. Hints for Problem 2: • radius
double radius;
• π value and cubic 𝑟" value
import java.lang.Math; double pi = Math.PI; double cubic = Math.pow(r, 3);
3. Hints for Problem 3:
• calculating wages if (hours < 40) { wages = hours * 8.25
} else { wages = 40 * 8.25 + (hours - 40) * 8.25 * 1.5;
}
• parsing command line arguments public static void main(String[] args) { int hours = Integer.parseInt(args[0]);
}
(a) cd to your .class directory and enter command line: java WageCaculator 45
replace WageCaculator with your class name
(b) in Eclipse: Select “Run Configurations ...” (or “Debug Configurations ...”) in “Run” menu, then create a new Java application configuration, finally in the “Arguments” tab of the created configuration, input the 45 in “Program arguments” box and click Run.
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