Question

review for the final

1. (1 point) Mark True or False in the left side of problems. (1) We can declare an array of string as string) greetings = {"good", "excellent"); (2) To declare and initialize an int variable i to be 2, we can write int=2; (3) For a properly declared and initialized int variable num, a condition to represent that num is between 10, 100) is written as (num >= 0 || num < 100). (4) Every nested if-else statement can be rewritten as a switch statement. (5) For a text box call txtAge, we can get its input by txtAge.Text. (6) The loop body of for-statement runs at least once. (7) We can only have an array of primitive types; we cannot have an array of Button. (8) The size of an array arr can be found out at arr.Length. (9) Given statement double sum = 1 + 2; Then sum /2 returns 1. (10) After statement bool b = int. TryParse("123a", out int num); Variable b is false and num is undefined. 2. (2 points each) Choose the most appropriate answer. (1) What are the values for variables a and b after the following code? int a = 1; int b = 2; a = b; b = a; (A) a is 1 and bis 1. (B) a is 2 and bis 2. (C) a is 2 and bis 1. (D) a is 1 and bis 2. (2) What are the values of variables a and b after the following code? int a = 1; int b = 2; int temp = a; a = b; b = temp; (A) a is 1 and bis 2. (B) a is 2 and bis 2. (C) a is 2 and bis 1. (D) a is 1 and bis 2.

Answer 1

Answer:

Question 1.
   1)True
   2)False (must be like int i = 2;)
   3)True
   4)True
   5)False (it should be txtAge.getText();)
   6)False (no if condition fails it won't run once)
   7)True
   8)True
   9)False (The Value is 1.5)
   10)True
Question 2.
   1)B - a is 2 and b is 2

it first assigns 2 to a and a to b so both are 2

   2)C - a is 2 and b is 1

it takes another variable temp so temp takes a and a takes b and b takes a

so a and b will swap

Thank You

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