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Java Exercises: Display and compute specified expressions

Java Basic: Exercise-9 with Solution

Write a Java program to compute the specified expressions and print the output.

Specified Expression :
(25.5 * 3.5 - 3.5 * 3.5) / (40.5 - 4.5)

Pictorial Presentation:

Java: Display and compute specified expressions

Sample Solution:

Java Code:

public class Exercise9 {
 
    public static void main(String[] arg) {

        System.out.println((25.5 * 3.5 - 3.5 * 3.5) / (40.5 - 4.5));
    }
}

Sample Output:

2.138888888888889

Flowchart:

Flowchart: Display and compute specified expressions

Java Code Editor:

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Previous: Write a Java program to display the specified pattern.
Next: Write a Java program to compute a specified formula.

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Java: Tips of the Day

Try and catch:

Java is excellent at catching errors, but it can only recover gracefully if you tell it what to do. The cascading hierarchy of attempting to perform an action in Java starts with try, falls back to catch, and ends with finally. Should the try clause fail, then catch is invoked, and in the end, there's always finally to perform some sensible action regardless of the results. Here's an example:

try {
        cmd = parser.parse(opt, args); 
       
        if(cmd.hasOption("help")) {
                HelpFormatter helper = new HelpFormatter();
                helper.printHelp("Hello ", opt);
                System.exit(0);
                }
        else {
                if(cmd.hasOption("shell") || cmd.hasOption("s")) {
                String target = cmd.getOptionValue("tgt");
                } // else
        } // fi
} catch (ParseException err) {
        System.out.println(err);
        System.exit(1);
        } //catch
        finally {
                new Hello().helloWorld(opt);
        } //finally
} //try

It's a robust system that attempts to avoid irrecoverable errors or, at least, to provide you with the option to give useful feedback to the user. Use it often, and your users will thank you!

Ref: https://red.ht/3EZc9OC