Warm-up Exercises

Questions

1. Give two examples of instant messaging applications.

   Solution

   Teams, Facebook messenger, Whatsapp, ICQ, skype, zoom, Discord, …

2. How many bits are in one byte?

   Solution

   8 bits

3. Why are “ancient” programming languages like COBOL and FORTRAN still in use?

   Solution

   Many banking systems still rely on COBOL in the current day.

#: The least significant (rightmost) bit of even numbers in binary representation is 1. ________

#: Commands for managing the IDE and for developing, maintaining and executing programs are contained in the menus, which are located on the menu bar. ________

#: Is the following statement true: 010000 < 001111? ________

#: You can browse the web from within the Visual Studio Community environment. ________

#: Visual Studio Enterprise can be used to create apps only in C#. ________

#: High-level computer languages are easily understood by a computer without any need of translation. ________

#: An assembler converts assembly language programs into machine language. ________

#: Is the role of CPU to govern computing devices and processes? ________

#: Was Windows system developed in sixties? ________

#: Do console applications provide visual environment? ________

1. Computers process data, using sets of instructions called …

• specifications
• computer programs
• recipes
• hardware

1. ______ Law states that every year or two, the computing power of computers doubles without any increase in price.

• Gate’s
• Moore’s
• Henderson’s
• None of the above.

1. The main purpose of the AUL unit is: ______.

• to store permanent data
• to store temporary data
• to cool the computer down and prevent overheating
• to perform calculations and logical comparisons for the computer

1. Binary code is: ______.

• a complex, but easy to use, modern programming language
• a series of 0s and 1s
• high-level machine language instructions
• a series of characters representing the numbers 0 to 9

1. The order of simplicity (easiest to hardest) to a human of the three basic types of languages is: ______.

• high-level, assembly, machine
• assembly, machine, high-level
• machine, high-level, assembly
• machine, assembly, high-level

1. Which of the following is true: C# ______.

• is object oriented
• contains a powerful class library
• is not limited to web-based applications
• all of the above

1. Visual C# programs are created using Microsoft’s Visual Studio–a collection of software tools called a(n) ______.

• operating system
• Integrated Programming Environment
• Integrated Development Environment
• Class Library

1. The purpose of the Visual Studio Enterprise is to ______.

• create a program
• run a program
• debug a program
• all of the above

1. This menu contains commands for opening projects, closing projects, printing project data, etc.

• View menu
• Edit menu
• Tools menu
• File menu

1. A single line comment in C# begins with which double symbol?

• **
• //
• ##
• $$

1. Which method is the starting point of any C# program?

• Open
• Main
• Start
• none of these.

1. All statements in C# end with:

• semicolon
• colon
• comma
• full stop

1. Violations of language rules are referred to as:

• semantic errors
• syntax errors
• run-time errors
• none of these

1. What operator is used to denote remainder (modulo) operation?

• &
• %
• #
• @

1. Which of the following is in highest-to-lowest order of operator precedence?

• multiplication, division, parentheses
• addition, subtraction, division
• parentheses, multiplication, addition
• none of these

1. In C# code: Console.WriteLine($"Initial value is: {myAccount.GetNumber()}"); which method is called (executed) first?

• WriteLine()
• GetNumber()
• they are called at the same time
• none of these

1. Which of these are binary operators?

• / (division)
• * (multiplication)
• + (addition)
• all of these

1. You can declare the same variable twice in a C# code.

• Yes
• No

1. It is good to initialize all variables upon their creation (declaration).

• Yes
• No

1. Is = the equality operator in C#?

• Yes
• No

1. Visual C# programs are created using Microsoft’s Visual Studio—a collection of software tools called a(n) _____.

• Operating system
• Integrated Programming Environment
• Integrated Development Environment
• Class Library.

1. The starting point of a C# application is the

• Main
• Start
• Open
• None of the above.

1. C# statements in C# usually end with:

• :
• ;
• #
• .

1. _____ are violations of language rules.

• Logic errors
• Syntax errors
• Run-time errors
• None of the above.

1. A variable is:

• An instruction for the compiler
• A location in memory where a value is stored
• A description of a method call (including the argument list)
• None of the above.

1. What is an algorithm?

• The actions (and their order) that solve a particular problem
• An English description of a problem to be solved
• The declaration of an object.
• None of the above.

1. The order of simplicity (easiest to hardest) to a human of the three basic types of languages is:

• High-level, machine, assembly
• Machine, high-level, assembly
• Assembly, machine, high-level
• High-level, assembly, machine.

1. Which of these are binary operators?

• * (multiplication)
• + (addition/concatenation)
• / (division)
• All of these.

1. What is the correct order of actions in developing software?

• Define the problem, develop an algorithm, code a C# program, run tests
• Code a C# program, develop an algorithm, run tests
• Code a C# program, run tests, develop an algorithm.
• Define the problem, run tests, code a C# program.

1. What is the resulting value of c at the end of the following code segment?

int c = 5;
c *= --c;

• 25
• 15
• 20
• None of the above

1. What value will be printed on the output:

int A = 16; int B = 3;
Console.WriteLine(A/B);

• 1
• 5.33
• -1
• 5

1. Some compilers will automatically remove body statements from loops that do not need to be executed multiple times through a process known as _____.

• Classification
• Optimization
• Interpretation
• None of the above.

Problems

1. Find 3 syntax errors in this short C# code.

int num11 =1;
int num2 ==2;
if num11>-num2) {Console.WriteLine(“Yes”);}
else {Console.WriteLie(“No”);} 

1. What sequence will appear on the output of this C# code? Which parameter of SD(int[] A, int B) method is passed by value?

   using System;
   class Program
   {
       static void SD(int[] A, int B)
       {
           A[2] += A[2];
           B /= B;
       }
       static void Main(string[] args)
       {
           int[] A = { 0, 1, 2, 3 };
           S(A, A[2]);
           Console.Write($"[{A[0]},{A[1]},{A[2]},{A[3]}]");
       }
   }

   Solution

   The sequence that appears in the output is 0, 1, 4, 3. The parameter int B is passed by value.

2. Consider the following code:

for (int y = 1; y <= 3; y++)
{
    for (int z = 1; z < 5; z++)
        Console.Write("Scene " + y + ", take " + z + ". " );
    Console.WriteLine();
}

• How many times does the outer loop iterate (i.e., how many scenes are shot)?
• How many times does the inner loop iterates (i.e., how many takes for each scene)?
• Finally, what is the total number of iteration of the nested loops (i.e., how many takes are made, total)?

1. Mark the pretest loops:

   • do while
   • switch
   • while
   • for
   • if-else-if

   Solution

   for and while are the pretest loops

2. Which of the following correctly declares and creates a two-dimensional rectangular array of integers?

   • int[,] sum = new int[10, 40];
   • int[][] sum = new int[25, 43];
   • int sum[] = new int[20, 20];
   • None of the above.

3. C# supports two types of two-dimensional arrays:

   • quadrilateral and isosceles
   • jagged and rectangular
   • jagged and round
   • None of the above.