Lesson 5: Functions in C# – Declaring, Calling, and Understanding Parameters

Functions Exercises in C# Programming Course

Enhance your C# programming skills with the exercises focused on functions. Learn how to write reusable code and simplify program structure in C# today!

Functions: greeting + farewell
Write a C# program whose Main must be like this: public static void Main() { SayHello(); SayGoodbye(); } SayHello and SayGoodbye are functio...

Function with parameters
Write a C# program whose Main must be like this: public static void Main() { SayHello("John"); SayGoodbye(); } SayHello and SayGoodbye are f...

Function returning a value
Write a C# program whose Main must be like this: public static void Main() { int x= 3; int y = 5; Console.WriteLine( Sum(x,y) ); } "Sum" is...

Function returning a value V2
Write a C# program whose Main must be like this: public static void Main() { Console.WriteLine("\"Hello, how are you\" contains {0} spaces", ...

Function write centered
Write a C# function to write centered on screen the text that is indicated as a parameter (supposing a screen width of 80 characters): WriteCentere...

Function write underlined
Write a C# function able to write centered on screen the text that is indicated as a parameter (supposing a screen width of 80 characters) and then un...

Function sum of array
Write a C# program to calculate the sum of the elements in an array. "Main" should be like this: public static void Main() { int[] example = {20, ...

Function double
Write a C# function named "Double" to calculate and return an integer number doubled. For example. Double(7) should return 14....

Function Double reference parameter
Write a C# function named "Double" to calculate the double of an integer number, and modify the data passed as an argument. It must be a "void" functi...

Function swap reference parameters
Write a C# function named "Swap" to swap the values of two integer numbers, which are passed by reference. An example of use might be: int x=5, ...

Function power local variables
Write a C# function named "Power" to calculate the result of raising an integer number to another (positive integer) number. It must return another in...

Function recursive power
Write a C# function that calculates the result of raising an integer to another integer (eg 5 raised to 3 = 53 = 5 × 5 × 5 = 125). This function must ...

Function Fibonacci
Write a C# program that uses recursion to calculate a number in the Fibonacci series (in which the first two items are 1, and for the other elements, ...

Function modify a letter in a string
Write a C# function named "ChangeChar" to modify a letter in a certain position (0 based) of a string, replacing it with a different letter: string...

Function IsPrimeTarea
Write a C# function named "IsPrime", which receives an integer number and retuns true if it is prime, or false if it is not: if (isPrime(127)) ......

Function Parameters of Main, Sum
Write a C# program named "sum", which receives two integer numbers in the command line and displays their sum, as in this example: sum 5 3 8...

Function SumDigits
Write a C# function SumDigits that receives a number and returns any results in the sum of its digits. For example, if the number is 123, the sum woul...

Function Factorial
The factorial of a number is expressed as follows: n! = n · (n-1) · (n-2) · (n-3) · ... · 3 · 2 · 1 For example, 6! = 6·5·4·3·2·1 Create a r...

Function Parameters of Main, Reverse
Write a C# program named "reverse", which receives several words in the command line and displays them in reverse order, as in this example: revers...

Function GetInt
Write a C# function named "GetInt", which displays on screen the text received as a parameter, asks the user for an integer number, repeats if the num...

Function tasks database
Write in C# an improved version of the "tasks database", splitting it into functions....

Function Greatest value in a array
Write a C# function which returns the greatest value stored in an array of real numbers which is specified as parameter: float[] data={1.5f, 0.7f, ...

Function factorial (iterative)
Write an C# iterative (non-recursive) function to calculate the factorial of the number specified as parameter: Console.Write ( Factorial (6) ); ...

Function WriteTitle
Write a C# function named "WriteTitle" to write a text centered on screen, uppercase, with extra spaces and with a line over it and another line under...

Function return value for Main
Write a C# program in which you write a title (using the previous WriteTitle function) which the user will specify in command line. If no text is spec...

Function CountDV
Write a C# function that calculates the amount of numeric digits and vowels that a text string contains. It will accept three parameters: the string t...

Function IsAlphabetic
Write a C# function that tells if a character is alphabetic (A through Z) or not. It should be used like this: if (IsAlphabetic ("a")) System.Cons...

Function IsNumber
Write a C# function that tells if a string is an intenger number. It should be used like this: if (IsNumber ("1234")) System.Console.WriteLine ("I...

Function calculator, params of Main
Write a C# program to calculate a sum, subtraction, product or division, analyzing the command line parameters: calc 5 + 379 (Parameters must be...

Function calculator, params and return value of Main
Write a C# program to calculate a sum, subtraction, product or division, analyzing the command line parameters: calc 5 + 379 (Parameters must be...

Function MinMaxArray
Write a C# function named MinMaxArray, to return the minimum and maximum values stored in an array, using reference parameters: float[] data={1.5f,...

Function Reverse, recursive
Write a C# program that uses recursion to reverse a string of characters (for example, from "Hello" it would return "olleH")....

Function WriteRectangle
Write a C# function WriteRectangle to display a (filled) rectangle on the screen, with the width and height indicated as parameters, using asterisks. ...

Function Palindrome, iterative
Write an C# iterative function to say whether a string is symmetric (a palindrome). For example, "RADAR" is a palindrome....

Function Palindrome, recursive
Write a C# recursive function to say whether a string is symmetric (a palindrome). For example, "RADAR" is a palindrome....

Function GetMinMax
Write a C# function named "GetMinMax", which will ask the user for a minimum value (a number) and a maximum value (another number). It should be calle...

Function Multiply & MultiplyR
Write two C# functions, Multiply and MultiplyR, to calculate the product of two numbers using sums. T he first version must be iterative, and the seco...