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257 changes: 254 additions & 3 deletions CSharpExercises/Exercises.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -18,12 +18,56 @@ public static string HelloWorld()
/* Alright - your turn now! */

// 1. Create a method called SayHello that accepts a string representing a name and returns a welcome message (E.g. "Hello John!")
public static string SayHello(string name)
{
return ("Hello " + name + "!");
}
// 2. Create a method called Sum that accepts two integers and returns their sum.
public static int Sum(int num1, int num2)
{
return (num1 + num2);
}
// 3. Create a method called Divide that accepts two decimals and returns the result of dividing the two numbers as a decimal.
public static decimal Divide(decimal num1, decimal num2)
{
return (num1 / num2);
}
// 4. Create a method called CanOpenCheckingAccount that accepts an integer representing a customers age, returning true if the age is greater than or equal to 18, or false if the argument is less than 18.
public static bool CanOpenCheckingAccount(int age)
{
if (age >= 18)
{
return true;
}
else {
return false;
}
}
// 5. Create a method called GetFirstName that accepts a string representing a full name (e.g. "John Smith"), and returns only the first name.
public static string GetFirstName(string fullname)
{
string firstname = fullname.Split(' ')[0];
return firstname;
}
// 6. Create a method called ReverseStringHard that accepts a string and returns the string in reverse. (No built in functions allowed)
public static string ReverseStringHard(string phrase)
{
char[] s = phrase.ToCharArray();
string reverse = String.Empty;
for (int i = s.Length - 1; i > -1; i--)
{
reverse += s[i];

}
return reverse;
}
// 7. Create a method called ReverseStringEasy that accepts a string and returns the string in reverse. (Using only built in functions)
public static string ReverseStringEasy(string phrase)
{
char[] charArray = phrase.ToCharArray();
Array.Reverse(charArray);
return new string(charArray);
}
// 8. Create a method called PrintTimesTable that accepts an integer and returns the times table as a string for that number up to the 10th multiplication.
/* e.g. 10 should return
* 10 * 1 = 10
Expand All @@ -36,10 +80,59 @@ public static string HelloWorld()
* 10 * 8 = 80
* 10 * 9 = 90
* 10 * 10 = 10 */
public static string PrintTimesTable(int number)
{

//StringBuilder sb = new StringBuilder();

// 9. Create a method called ConvertKelvinToFahrenheit that accepts a double representing a temperature in kelvin and returns a double containing the temperature in Fahrenheit.
//for (int i = 1; i <= 10; i++)
//{

// sb.AppendLine($"{number} * {i} = {i * number}");

//}

//Console.WriteLine(sb.ToString());
//Console.ReadLine();
//return sb.ToString();


string timestable = String.Empty;

for (int i = 1; i < 10; i++)
{

timestable += $"{number} * {i} = {i * number}\r\n";
}
return timestable += $"{number} * 10 = " + number * 10;

}


// 9. Create a method called ConvertKelvinToFahrenheit that accepts a double representing a temperature in kelvin and returns a double containing the temperature in Fahrenheit.\
public static double ConvertKelvinToFahrenheit(double temp)
{
//Console.WriteLine(((temp - 273) * 9d/ 5) + 32);
//Console.ReadLine();
double result = temp * 9.0 / 5.0 - 459.67;
return Math.Round(result, 2);
}
// 10. Create a method called GetAverageHard that accepts an array of integers and returns the average value as a double. (No built in functions allowed)
public static double GetAverageHard(int[] args)
{
double sum = 0;
for (int i = 0; i < args.Length; i++)
{
sum += args[i];
}

return sum/args.Length;
}
// 11. Create a method called GetAverageEasy that accepts an array of integers and returns the average value as a double. (Using only built in functions)
public static double GetAverageEasy(int[] args)
{
return args.Average();
}
// 12. Create a method called DrawTriangle that accepts two integers - number and width and returns a string containing a drawn triangle using the number parameter.
/* e.g. Number: 8, Width: 8 should return
* 88888888
Expand All @@ -50,21 +143,153 @@ public static string HelloWorld()
* 888
* 88
* 8 */
public static string DrawTriangle(int number, int width)
{
string triangle = string.Empty;

for (int i = 0; i < width; i++)
{

for (int j = 0; j < width; j++)
{
if (j <= ((width - 1) - i))
{
triangle += number;
}
//else
//{
// triangle += " ";
//}
}

if (i != (width - 1))
{
triangle += "\r\n";
}
}

//string triangle = "";
//int rows = width;
//for (int i = 0; i < rows - 1; i++)
//{
// for (int j = 0; j < width; j++)
// {
// triangle += number;
// }
// triangle += "\r\n";
// width--;
//}
//return triangle + number;
//Console.WriteLine(triangle);
//Console.Write(Constants.TriangleFor8and5);
//Console.ReadLine();
return triangle;
}

// 13. Create a method called GetMilesPerHour that accepts a double representing distance and three integers representing hours, minutes and seconds. The method should return the speed in MPH rounded to the nearest whole number as a string. (e.g. "55MPH")


// 13. Create a method called GetMilesPerHour that accepts a double representing distance and three integers representing hours, minutes and seconds. The method should return the speed in MPH rounded to the nearest whole number as a string. (e.g. "55MPH")
public static string GetMilesPerHour(double num, int hours, int minutes, int seconds)
{
double time = hours + minutes / 60.0 + seconds / 3600.0;
double speed = Math.Round(num / time, 0);
return $"{speed}MPH";

}

// 14. Create a method called IsVowel that accepts a char parameter and returns true if the parameter is a vowel or false if the parameter is a consonant.
public static bool IsVowel(char c)
{
bool vowel = false;
char[] vArray = new char[] {'a', 'e', 'i', 'o', 'u' };
for (int i = 0; i < vArray.Length; i++)
{
if (c == vArray[i])
{
vowel = true;
}
}
return vowel;
}
// 15. Create a method called IsConsonant that accepts a char parameter and returns true if the parameter is a consonant or false if the parameter is a vowel.
public static bool IsConsonant(char c)
{
bool vowel = true;
char[] vArray = new char[] { 'a', 'e', 'i', 'o', 'u' };
for (int i = 0; i < vArray.Length; i++)
{
if (c == vArray[i])
{
vowel = false;
}
}
return vowel;
}
// 16. The Collatz conjecture, named after Lothar Collatz of Germany, proposed the following conjecture in 1937.
// Beginning with an integer n > 1, repeat the following until n == 1. If n is even, halve it. If n is odd, triple it and add 1. Following these steps, the function will always arrive at the number 1.
// Create a method called CollatzConjecture that accepts an integer and returns the number of steps required to get to n == 1 as an integer.

public static int CollatzConjecture(int num)
{
int steps = 0;
while (num != 1)
{
if (num % 2 == 0)
{
num /= 2;
}
else
{
num = num * 3 + 1;
}
steps++;
}
return steps;
}
// 17. Create a method called GetNext7Days that accepts a DateTime object and returns an array of DateTime objects containing the next 7 days (including the given day).
public static DateTime[] GetNext7Days(DateTime date)
{
int numDays = 7;
DateTime[] nextDays= new DateTime[numDays];

for (int i = 0; i < nextDays.Length; i++)
{
nextDays[i] = date;
date = date.AddDays(1);
}
return nextDays;
}
// 18. Create a method called IsInLeapYear that accepts a DateTime object and returns true if the date falls within a leap year and false if not. (No built in functions allowed)
public static bool IsLeapYear(int date)
{
bool isLeap = false;
if (date % 4 == 0 && (date % 100 != 0 || date % 400 == 0))
{
return true;
}
return isLeap;
}
// 19. Create a method called MortgageCalculator that accepts 2 decimals representing loan balance and interest rate, an integer representing loan term in years, and an integer representing the payment period.
/* Payment periods: 1 - Monthly, 2 - Bi-Monthly (Every 2 months) */
public static double MortgageCalculator(decimal loanBalance, decimal rate, int years, int paymentPeriod)
{
double monthlyPayment = 0;
double lb = decimal.ToDouble(loanBalance);
double r = decimal.ToDouble(rate);

int y = years;
int n = paymentPeriod;
if (n == 12)
{
double numPayments = y * 12;
monthlyPayment = ((r / 1200) + (r / 1200) / (Math.Pow(1 + (r / 1200), numPayments) - 1)) * lb;
}
else
{
double numPayments = y * 6;
monthlyPayment = ((r / 600) + (r / 600) / (Math.Pow(1 + (r / 600), numPayments) - 1)) * lb;
}
return Math.Round(monthlyPayment, 2);
}
// 20. Create a method called DuckGoose that accepts an integer. Iterate from 1 to this integer, building a string along the way.
// If the current number in the iteration:
// Is divisible by 3, append "Duck" + Environment.NewLine; to the string.
Expand Down Expand Up @@ -93,6 +318,32 @@ public static string HelloWorld()
* 19
* Goose
*/
public static string DuckGoose(int num)
{
string result = string.Empty;

for (int i = 1; i <= num; i++)
{
if (i % 3 == 0)
{
result += "Duck";
}
if (i % 5 == 0)
{
result += "Goose";
}
if (i % 3 != 0 && i % 5 != 0)
{
result += $"{i}";
}
if (i != num)
{
result += Environment.NewLine;
}
}

return result;
}

// If you've finished all these challenges, sign up for CodeWars.com and try to complete a few C# challenges there!
}
Expand Down
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