Coding tips to learn

Question 1

Modulus

Answer 1

Find remainder - %

Question 2

Truncation of a string

Answer 2

string Substring(int startIndex)
string Substring(int startIndex, int length)

Question 3

Random number generation

Answer 3

Random rnd = new Random();
int number = rnd.Next(1,13) // between 1 and 12

Question 4

What is a local variable?

Answer 4

can only be accessed from the subroutine within which it is declared

Question 5

what is a global variable?

Answer 5

can be accessed from any part of the program

Question 6

How do you declare an array?

Answer 6

string[] cars;

Question 7

How do you add values to your array?

Answer 7

cars = new string[] {“Volvo”, “BMW”, “Ford”}

Question 8

How to change values in an array?

Answer 8

cars[0] = “Opel”;

Question 9

How to convert a string to an array?

Answer 9

char[] chars = input.ToCharArray();

Question 10

How to convert array to string?

Answer 10

string output = new string(chars)

Question 11

How do you make a Dictionary?

Answer 11

Dictionary<TKey, TValue> dictionaryName = new Dictionary<TKey, TValue>();

(where Tkey and TValue are data types. )

Question 12

How do you loop through a Dictionary?

Answer 12

when looping through a dictionary you are looping through the pairs in the dictionary….

foreach (var pair in nameOfDictionary)
{
}

Question 13

Getting the Key or Value of a pair in a Dictionary:

Answer 13

in forloop ….
pair.Key
pair.Value

Question 14

How do you change a value in a Dictionary?

Answer 14

nameOfDictionary [TKey] = TValue

Question 15

How to check a string contains a certain string/char:

Answer 15

“STRING”.Contains(c.ToString())
//for char

OR

“STRING”.Contains(str)
//for substring