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Control Instructions (C# Programming) Question and Answers-Page first

Control Instructions problems


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  • 1. Which of the following can be used to terminate a while loop and transfer control outside the loop?

    1. exit while
    2. continue
    3. exit statement
    4. break
    5. goto

  • Options
  • A. 1, 3
  • B. 2, 4
  • C. 3, 5
  • D. 4, 5
  • E. None of these

  •           Discuss     

  • 2. Which of the following statements are correct?

    1. A switch statement can act on numerical as well as Boolean types.
    2. A switch statement can act on characters, strings and enumerations types.
    3. We cannot declare variables within a case statement if it is not enclosed by { }.
    4. The foreach statement is used to iterate through the collection to get the desired information and should be used to change the contents of the collection to avoid unpredictable side effects.
    5. All of the expressions of the for statement are not optional.

  • Options
  • A. 1, 2
  • B. 2, 3
  • C. 3, 5
  • D. 4, 5
  • E. None of these

  •           Discuss     

  • 3. What will be the output of the C#.NET code snippet given below?

    int val;
    for (val = -5; val <= 5; val++)
    {
        switch (val)
        {
            case 0:
                Console.Write ("India"); 
                break;
        }
        
        if (val > 0)
            Console.Write ("B"); 
        else if (val < 0)
            Console.Write ("X");
    }

  • Options
  • A. XXXXXIndia
  • B. IndiaBBBBB
  • C. XXXXXIndiaBBBBB
  • D. BBBBBIndiaXXXXX
  • E. Zero

  •           Discuss     

  • 4. Which of the following statements is correct?

  • Options
  • A. It is not possible to extend the if statement to handle multiple conditions using the else-if arrangement.
  • B. The switch statement can include any number of case instances with two case statements having the same value.
  • C. A jump statement such as a break is required after each case block excluding the last block if it is a default statement.
  • D. The if statement selects a statement for execution based on the value of a Boolean expression.
  • E. C# always supports an implicit fall through from one case label to another.

  •           Discuss     

  • 5. What will be the output of the code snippet given below?

    int i;
    for(i = 0; i<=10; i++)
    {
        if(i == 4)
        {
            Console.Write(i + " "); continue;
        }
        else if (i != 4)
            Console.Write(i + " "); else
        break;
    }

  • Options
  • A. 1 2 3 4 5 6 7 8 9 10
  • B. 1 2 3 4
  • C. 0 1 2 3 4 5 6 7 8 9 10
  • D. 4 5 6 7 8 9 10
  • E. 4

  •           Discuss     

  • 6. Which of the following statements are correct about the C#.NET code snippet given below?

    if (age > 18 && no < 11)
        a = 25;
    1. The condition no < 11 will be evaluated only if age > 18 evaluates to True.
    2. The statement a = 25 will get executed if any one condition is True.
    3. The condition no < 11 will be evaluated only if age > 18 evaluates to False.
    4. The statement a = 25 will get executed if both the conditions are True.
    5. && is known as a short circuiting logical operator.

  • Options
  • A. 1, 3
  • B. 2, 5
  • C. 1, 4, 5
  • D. 3, 4, 5
  • E. None of these

  •           Discuss     

  • 7. What will be the output of the C#.NET code snippet given below?

    int i = 2, j = i;
    if (Convert.ToBoolean((i | j & 5) & (j - 25 * 1)))
        Console.WriteLine(1); 
    else
        Console.WriteLine(0);

  • Options
  • A. 0
  • B. 1
  • C. Compile Error
  • D. Run time Error

  •           Discuss     

  • 8. What will be the output of the C#.NET code snippet given below?

    char ch = Convert.ToChar ('a' | 'b' | 'c'); 
    switch (ch)
    {
        case 'A': 
        case 'a':
        Console.WriteLine ("case A | case a");
        break;
        
        case 'B': 
        case 'b':
        Console.WriteLine ("case B | case b");
        break;
        
        case 'C':
        case 'c':
        case 'D':
        case 'd':
        Console.WriteLine ("case D | case d");
        break;
    }

  • Options
  • A. case A | case a
  • B. case B | case b
  • C. case D | case d
  • D. Compile Error
  • E. No output

  •           Discuss     

  • 9. Which of the following statements is correct about the C#.NET code snippet given below?

    int i, j, id = 0; switch (id)
    { 
        case i:
            Console.WriteLine("I am in Case i");
            break; 
        
        case j:
            Console.WriteLine("I am in Case j");
            break;
    }

  • Options
  • A. The compiler will report case i and case j as errors since variables cannot be used in cases.
  • B. Compiler will report an error since there is no default case in the switch case statement.
  • C. The code snippet prints the result as "I am in Case i"".
  • D. The code snippet prints the result as "I am in Case j".
  • E. There is no error in the code snippet.

  •           Discuss     

  • 10. Which of the following statements is correct about the C#.NET code snippet given below?

    switch (id)
    {
        case 6: 
            grp = "Grp B"; 
            break;
        
        case 13:
            grp = "Grp D";
            break;
        
        case 1:
            grp = "Grp A";
            break;
        
        case ls > 20:
            grp = "Grp E";
            break ;
        
        case Else:
            grp = "Grp F";
            break;
    }

  • Options
  • A. Compiler will report an error in case ls > 20 as well as in case Else.
  • B. There is no error in this switch case statement.
  • C. Compiler will report an error only in case Else.
  • D. Compiler will report an error as there is no default case.
  • E. The order of the first three cases should be case 1, case 6, case 13 (ascending).

  •           Discuss     


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