Practice Problems

Below are three quick problems to help you apply what you learned. Create a new document for each problem so you can practice building from scratch.

Problem 1: Simple Arithmetic Calculations

Objective: Practice using arithmetic operators to perform basic calculations.

Instructions:

Declare Variables:
- Create two variables num1 and num2 and assign them numerical values.
Perform Calculations:
- Calculate the sum, difference, product, quotient, and remainder of num1 and num2.
- Increment num1 by 1 and decrement num2 by 1.
Log Results:
- Use console.log to display each result with descriptive messages.

Problem 2: Variable Assignment Operations

Objective: Utilize assignment operators to modify variable values.

Instructions:

Initialize Variable:
- Create a variable score and assign it a value of 50.
Modify Variable Using Assignment Operators:
- Add 25 to score using the += operator.
- Multiply score by 2 using the *= operator.
- Subtract 30 from score using the -= operator.
Log Final Score:
- Use console.log to display the final value of score.

Problem 3: Comparing Values

Objective: Use comparison operators to evaluate different scenarios.

Instructions:

Declare Variables:
- Create two variables a and b with values 10 and "10" respectively.
Perform Comparisons:
- Check if a is equal to b using == and log the result.
- Check if a is strictly equal to b using === and log the result.
- Check if a is greater than 5 and less than 15, and log the result.
Log Results:
- Use console.log to display the outcomes of each comparison.

Advance Problems

Problem 1: Salary Adjuster

Objective:

Calculate an employee’s final salary after applying bonuses and deductions using a variety of operators.

Instructions:

Declare Variables:
- Create a variable baseSalary with a numerical value (e.g., 3000).
- Create a variable bonusPercentage representing the bonus rate (e.g., 0.10 for 10%).
- Create a variable deduction that holds a fixed deduction amount (e.g., 150).
Compute Bonus and Update Salary:
- Calculate the bonus amount by multiplying baseSalary and bonusPercentage.
- Use the addition assignment operator (+=) to add the bonus to baseSalary.
- Subtract the deduction amount from baseSalary using the subtraction assignment operator (-=).
Additional Increments:
- Simulate an extra performance bonus by incrementing the salary by a fixed amount (e.g., increment baseSalary by 50 using the increment operator or a compound operator).
Comparison Check:
- Use a comparison operator to check whether the final salary is above a specified threshold (e.g., 3500) and log a message that indicates if the salary is “Good” or “Needs Improvement.”
Log All Results:
- Use console.log() to display intermediate values (bonus, salary after bonus and deduction, and final salary) along with descriptive messages.

Expected Outcome:

A series of console messages displaying the bonus amount, the updated salary after adding the bonus and subtracting the deduction (plus any performance bonus), and a final message indicating whether the employee’s salary meets or exceeds the threshold.

Problem 2: Shopping Cart Total

Objective:

Simulate a shopping cart calculation by adding product prices and applying a discount if the total exceeds a given threshold.

Instructions:

Declare Variables:
- Create variables for individual item prices, e.g., item1 = 45, item2 = 30, and item3 = 25.
- Create a variable total initialized to 0.
- Create a variable discountThreshold (e.g., 100) and a discountAmount (e.g., 10).
Calculate Total:
- Use arithmetic operators to sum the prices of the items and assign the result to total.
- Alternatively, add each item to total using the addition assignment operator (+=).
Apply Discount Conditionally:
- Use comparison operators to check if total is greater than or equal to discountThreshold.
- If it is, subtract discountAmount from total using a compound operator (e.g., -=).
Simulate Additional Items:
- For extra practice, simulate adding another item by incrementing a counter (if you have a variable for item count) or adding another price to total.
Log Results:
- Display the original total, the decision whether a discount was applied, and the final total after applying the discount.

Expected Outcome:

Console output showing the running total of the shopping cart, a conditional discount applied if the threshold is met, and a final total amount displayed with descriptive messages.

Problem 3: Quiz Score Checker

Objective:

Create a simple quiz score calculator that evaluates user answers and computes a final score using various operators.

Instructions:

Set Up Quiz Data:
- Declare a variable correctAnswers with a numeric value representing the number of correct questions (e.g., 0).
- Assume you have an array of user answers and the corresponding correct answers:

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let userAnswers = ['A', 'B', 'C', 'D'];
let expectedAnswers = ['A', 'C', 'C', 'D'];

Compare Answers:
- Loop through the arrays and compare each user answer to the expected answer.
- Use the strict equality operator (===) to check for a match.
- If the answer is correct, use the increment operator (++) on correctAnswers.
Calculate Final Score:
- Calculate the percentage score by dividing correctAnswers by the total number of questions and then multiplying by 100.
- Store the result in a variable scorePercentage.
Decision Message:
- Use comparison operators to check if scorePercentage is above a certain pass mark (e.g., 70).
- Log a message indicating whether the user “Passed” or “Failed” the quiz.
Log All Results:
- Use console.log() to output the number of correct answers, the score percentage, and the pass/fail message.

Expected Outcome:

Console messages that display the number of correct answers, the computed percentage score, and a final message stating whether the user passed or failed, based on the evaluation using arithmetic and comparison operators.

Day 3: Operators in JavaScript