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Thread: could someone check over these ansers?

  1. #1
    Join Date
    Jul 2004
    Posts
    63

    could someone check over these ansers?

    Im taking a intro to alogorithm design class. I was going over my study sheet for my first exam and just wanted to make sure my answers were correct before I study something that was wrong anyone have any input/suggestions/corrections i'd really appreciate it


    Write a statement that declares an integer variable
    int hoursWorked = 3 ;

    Write a statement that declares a String reference variable

    String name = “bob”;

    Write a statement that declares a character variable storing an ‘a’

    char letter = ‘a’;

    Write a statement that declares a String object storing the character sequence “hello friend”.

    String greeting = “hello friend” ;

    Write a statement that declares a Scanner object that references the standard input stream.

    Scanner stdin = newScanner(System.in);

    Write a statement that reads an integer from the standard input stream (assuming it has been declared as in the last statement)
    int hours = stdin.nextInt();

    Write a single Java statement that outputs your first name onto the monitor (standard output stream) and your last name on the following line.

    System.out.print(“Susan \n Buck”);


    Write a Java program to compute and display the product of two integers.

    //Author: Susan Buck

    public class product {

    public static void main(String[]args) {

    int A = 2 ;
    int B = 3 ;
    int calc = A * B ;

    System.out.print(“The product of” + A + “and” + B + “is” + calc) ;

    }
    }

    Write a Java program to compute and display the area of a rectangle.

    //Author: Susan Buck

    public class rectangle {

    public static void main (String[]args) {

    int topbot = 4 ;
    int sides = 2 ;
    int area = top * side ;

    System.out.print (“The area of a triangle with a top and bottom of” + topbot + “inches, and sides of” + sides + “inches, has an area of” + area) ;

    }
    }

    Write a Java program to compute and display the location of all occurrences of “ssi” in the word Mississippi.

    //Author: Susan Buck

    public class state

    public static void main (String[]args) {

    String count = “mississippi” ;
    String searchString = “ssi” ;
    int n1 = count.indexOf(searchString,1) ;
    int n2 = count.indexOf(searchString, n1 + 2) ;

    System.out.print(“The letters ssi occurs at positions” + n1 + “and” + n2 + “in the word Mississippi”)

    }
    }

  2. #2
    Join Date
    Nov 2003
    Location
    Jerryville, Tejas
    Posts
    11,715
    That generally looks ok so here are some random comments. Some of the problems may be a bit tricky, e.g. the difference between a String reference and a String object. In one case the teacher may be looking for

    String greeting = new String("hello friend");

    rather than a simple initialization assignment.

    Also keep in mind that object names begin with a lower case letter while class names are caplitalized. This is not a requirement of the compiler but it *is* the OO standard way of doing things. So A and B aren't really good names.

    What if you didn't know ahead of time that Mississippi had exactly two occurances of "ssi"? That makes for a more "interesting" problem.

  3. #3
    Join Date
    Jan 2004
    Location
    Melbourne, Australia
    Posts
    5,298
    Also, you will want to add some spaces in your string concatenation. Otherwise, it will look like this: "The product of2and3is5". You may want to use println instead of print as it will automatically place a newline character at the end of the string.
    Code:
    System.out.println(“The product of ” + A + “ and ” + B + “ is ” + calc) ;
    Regards.

  4. #4
    Join Date
    Dec 2002
    Location
    Calgary, Canada
    Posts
    6,145
    I am sure its a typo but still worth a pointer, this line below
    Scanner stdin = newScanner(System.in);
    should be
    Scanner stdin = new Scanner(System.in);

    to decalre an instance of an object you usually use "new" keyword.
    Cheers

    Khalid

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