vl - simple functions

Introduction to Simple Functions

• Focus: Writing simple functions for basic programming tasks rather than advanced concepts.

• Advanced functions (e.g., return functions, anonymous functions) will be utilized in client-server programming in the future.

Detecting Odd or Even Numbers

• Function Name: isEven

  • Purpose: To determine if a given number is even.

  • Parameters:

  • number (n)

  • Returns: A boolean value (true or false).

  • Logic: The function checks if the remainder of the variable n when divided by 2 is equal to zero using modulo.

  • Expression Used:

  • $n ext{ mod } 2 = 0$

  • Example:

  • When n = 16, output is true (even).

  • When n = 17, output is false (odd).

Converting Kilometers to Miles

• Function Name: toMiles

  • Purpose: To convert kilometers to miles.

  • Parameters:

  • kilometers

  • Returns: Calculated miles based on the formula.

  • Conversion Formula:

  • $ext{miles} = ext{kilometers} imes 0.6214$

  • Example Invocation: Setting kilometers to 10 and displaying results.

Insurance Calculation Functionality

• Function Name: calcInsuranceNeeded

  • Purpose: To calculate the minimum insurance required for homeowners.

  • Parameters:

  • costOfStructure

  • Returns: The minimum insurance required which is 80% of the cost of the structure.

  • Calculation Formula:

  • $0.80 imes ext{costOfStructure}$

  • Example:

  • If cost of the building is 5,200,000, the function returns:

  • Minimum insurance=$(0.80 imes 5200000)$.

Monthly Automobile Costs Calculation

• Function Name: calcTotalMonthlyCost

  • Purpose: To calculate the total monthly and annual automotive expenses.

  • Import Parameters: An array of monthly expenses.

  • Monthly Expense Example Variables:

  • Auto payment: $685

  • School Loans: $585

  • Insurance: $385

  • Gas: $45

  • Oil Change: $28

  • Tires Replacement: $20/year (monthly equivalent is $rac{20}{12}$)

  • Maintenance: $35/month

• Total Monthly Cost Calculation Logic:

  • Initialize total variable to sum all expenses.

  • Annual Cost Calculation:

  • $ext{annualCost} = ext{totalMonthlyCost} imes 12$

  • Example Invocation: Calling function with expenses to calculate total monthly expense and then annual cost.

Error Handling and Code Adjustment

• Troubleshoot issues where incorrect parameters are passed while calculating annual costs.

• Importance of storing intermediate calculation results for clarity and accuracy.

Conclusion

• Summarized the use of simple, effective function definitions for common programming tasks such as number checks, unit conversion, financial calculations, and understanding function parameters and return values.

• Encouragement to further explore and refine function applications as programming skills develop.