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Questions

  1. Write method signatures for:

    • a method that takes one integer parameter
    • a method that returns a Boolean value
    • a method that takes one double and one string parameter and returns an integer value
    • a method that takes one integer reference parameter and returns a boolean value
    • Draw a hierarchy chart for the completed calculator program
    • What is meant by the term structured programming?
    • Explain how the two methods below can each use a variable named x.
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    public void FirstMethod(int number)
{
    int x = number;
}
public void SecondMethod()
{
    int x = 0;
}

  2. What might be considered wrong with the following method?

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    public void calcEverything(ref int a, ref int b, ref int c)
{
    int total, avg;
    total = a + b + c;
    Console.WriteLine("the total of inputs = " + total);
    avg = total / 3;
    Console.WriteLine("the average of inputs = " + avg);
}

Additional Exercises

  1. Create a method GetMax() with two integer (int) parameters, that returns the larger of the two numbers. Write a program that reads three numbers from the console and prints the biggest of them. Use the GetMax() method you just created.
  2. Write a method that finds how many times a certain number can be found in a given array. Write a program to test that the method works correctly.
  3. Write a program that calculates and prints the n! for any n in the range \(1\) .. \(100\).

  4. Write a program to convert a \(8\)-bit binary number into its denary equivalent. Decompose the program into several methods e.g. InputBinaryValue(), ConvertBit(), OutputResult(). Use the following pseudocode:

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    Result = 0
ColumnValue = 128
PRINT "Enter a binary number to convert: "
BinaryString <- INPUT
FOR i = 0 TO (Length of BinaryString - 1)
    BitValue = 0
    IF (BinaryString[i] is a "1") THEN
        bitValue = bitValue + ColumnValue
    ELSE
        BitValue = bitValue
    END IF
    ColumnValue = ColumnValue /2
    Result = Result + bitValue
END FOR
PRINT Result
    • Test your program with the following values: (a) 10000000; (b) 11111111; (c) 10010011
    • Adapt the program so it can work with any length of binary number

    • Write a program that solves the following tasks:

    • Put the digits from an integer number into a reversed order.

    • Calculate the average of given sequence of numbers.
    • Solve the linear equation a * x + b = 0.

    Create appropriate methods for each of the above tasks. Make the program show a text menu to the user. By choosing an option of that menu, the user will be able to choose which task to be invoked