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COMM 205 Midterm Concordia University trial exam solution
- A company purchases notebook and tablet computers for its operations for set prices. Notebooks cost $1,100 and the tablets cost $450. Write a code fragment that takes the number of notebooks and tablets as inputs and computes the total cost. The inputs are provided through the textboxes txtNotebooks and txtTablets. The output should be displayed in lblTotal. (10 points)
double txtNotebooks, txtTablets, total;
txtNotebooks = 1100; txtTablets 450;
lblTotal.Text = total.ToString();
- decimal a = 10m;
double b = a;
The above code has a problem. To correct it you need to usea. Try-catch
b. TryParse()
c. Math class
d. Casting
- Which of the following conditions checks if price is between $10 and $20 inclusivelya. price >= 10 || price <=20;
b. price >= 10 && price <=20;
c. 20 >= price >= 10;
d. 10 <= price <= 20;
If quantity has a value of 5, what is the value of discount after these statements are executed?
switch (quantity) {
case 1: case 2: case 3:
discount = 0; break;
discount = .1; default: discount = .2;
break;
break;
}
The switch statement has the following structure:
switch (test variable or expression) { case value_1: … case value_2: … } The valid types of test variable (or expression) include all of the following, except:
a. string
b. double
c. char
d. int
case "ca": country = "Canada"; break; case "fr": country = "France"; break; case "it": country = "Italy"; break; default: country = "No country found"; break; }
lblCountry.Text = country;
What is the term for a method that responds to events?a. event procedure
b. event exception
c. event wiring
d. event handler
The variable averageClassSize would be declared asa. Short
b. double
c. int
d. decimal
Customers who have at least 3 years of membership or spent at least $2000 at ourstore will get the star customer status. To implement such a rule we would use a. "if - else if"
b. ">=" and "||"
c. ">=" and "&&"
d. ">" and "&&"
Labels can be used ...a. for outputs
b. for inputs
c. both for inputs and outputs
d. only for labeling controls
What you may have to use when you want to convert between different numeric types ina statement a. Conversion
b. ToString()
c. TryParse()
d. Casting
What is wrong in the following code?
int sum = 0; int i;
for (int i = 10; i > 0; i --)
sum += i; i++;
a. i is changed within the body of the loop
b. Nothing
c. The starting values is 10
d. the decement i-- is used
To read exam results from a text file one would usea. switch
b. nested if
c. for
d. while
The following statement about a local variable is true: a. if a data item is needed only within a single method, it should be stored in a localvariable
b. a local variable is declared at the class level
c. a local variable is available in all methods within a form
d. a local variable exists in memory until the form is closed
In an organization when an employee is hired they get a set starting salary. Every second year the salary grows by 3%. Starting with the 11 years of service the salary willgrow by 2% every second year. Write a program fragment that takes number of years ofservice from a text box txtYears, and starting salary from txtStart, calculates salary for every second year (starting with year 1), and displays it in a list box lstSalary. Use data validation for the inputs to make sure they are numeric. (10 points)
The following statement about constants/variables is true, except: a. A variable may be assigned a value after it is declared
b. A constant must be assigned a value when it is declared
c. A constant cannot be assigned a value after it is declared
d. A variable must be assigned a value when it is declared
What is true abut the following loop
decimal counter = 1;
do{
sum += counter;
}
while(counter < 1) a. will never run
b. is an infinite loop
c. will not run since counter is not an int
d. will run one time
A variable taxRefund should be declared asa. Ulong
b. double
c. decimal
d. int
