Lesson 04 Switch Cases | C# Online Compiler

Lesson 04 Switch Cases by ghostie

using System;
using System.Runtime.ConstrainedExecution;

public class Program
{

    public static void Main()
    {
        // if/else/else if


        int a = 34, b = 3, c = 45454;

        if (a > b && a > c)
        {
            Console.WriteLine("a is highest!");
        }
        else if (b > a && b > c)
        {
            Console.WriteLine("b is highest!");
        }
        else if (c > a && c > b)
        {
            Console.WriteLine("c is highest!");
        }
        else
        {
            Console.WriteLine("Um, I don't know...");
        }

        // Q1: Write an if statement, as concisely as possible, that prints
        // 'one of the numbers is negative' if ANY ONE of the numbers are negative
        if (a < 0 || b < 0 || c < 0)
        {
            Console.WriteLine("One of the numbers is negative");
        }

        // Q2: Write code that will identify if AT LEAST TWO of the three numbers is EVEN
        // The code should print "Two of the numbers are even!"
        int numberOfEven = 0;
        if (a % 2 == 0)
        {
            numberOfEven++;
        }
        if (b % 2 == 0)
        {
            numberOfEven++;
        }
        if (c % 2 == 0)
        {
            numberOfEven++;
        }
        if (numberOfEven > 1)
        {
            Console.WriteLine("At least 2 of the 3 numbers is even!");
        }

        // Switch/case

        // Before we look into this
        // One more if/else example to explain why need switch/case...

        int mood = 3;
        if (mood == 1)
        {
            Console.WriteLine("Feeling great!");
        }
        else if (mood == 2)
        {
            Console.WriteLine("Feeling so-so!");
        }
        else if (mood == 3)
        {
            Console.WriteLine("Feeling down!");
        }
        else
        {
            Console.WriteLine("Invalid input!");
        }

        // ... when the number of if/else statements gets a bit large (say, about 4-5 statements)
        // We should consider using switch/case because it *can* be more readable

        mood = 10;
        switch (mood)
        {
            case 1:
                Console.WriteLine("Feeling great!");
                break;
            case 2:
                Console.WriteLine("Feeling so-so!");
                break;
            case 3:
                Console.WriteLine("Feeling down!");
                break;
            default: // else
                Console.WriteLine("Invalid input!");
                break;
        }

        // Here is another way we can use switch/case
        // This demonstrates fall-through
        Console.WriteLine("A funny switch/case");
        int someNumber = -234;
        switch (someNumber)
        {
            case 0:
            // It is 0, but case 3 gets executed!
            case 1:
            case 2:
            case 3:
                Console.WriteLine("The number is less than 4");
                break; // This is a bit like: someNumber == 1 || someNumber == 2 || someNumber == 3
            case 4:
            case 5:
                Console.WriteLine("The number is 4 or 5");
                break;
            // It is best practice to always have a default case in a switch block
            default:
                Console.WriteLine("The number is negative OR greater than 5!");
                break;

        }
		string Tri1 = Console.ReadLine();
		string Tri2 = Console.ReadLine();
		string Tri3 = Console.ReadLine();
		
		checkParse(Tri1);
		checkParse(Tri2);
		checkParse(Tri3);		
		
		if (Tri1 + Tri2 + Tri3 == 180) {
			Console.WriteLine("This is a Valid triangle");
		} else {
			Console.WriteLine("This is an INVALID triangle");
		}
		
//• Write a program which asks a user to enter three integers representing the internal angle measurements of a possible triangle. The program should the print whether the angles are from a valid triangle. (Do you remember the internal angle sum of a triangle?)
//• Recall the class practice question to write a method which tests if a char is vowel or a consonant. Write a switch/case version of this code. Experiment with letting cases fall into each other (see the above example).
//• Write a program which asks the use to input any positive integer. Your program should then print a day of the week corresponding to that number.
//		o Examples of required input and output:
//		▪ 0 -> Print “Monday”
//		▪ 3 -> Print “Wednesday”
//		▪ 7 -> Print “Monday”
//		▪ 8 -> Print “Tuesday”
//		▪ 25 -> Print “Friday”		
		
		
		
		
		
    }
}

​x
 
using System;
using System.Runtime.ConstrainedExecution;
​
public class Program
{
​
    public static void Main()
    {
        // if/else/else if
​
​
        int a = 34, b = 3, c = 45454;
​
        if (a > b && a > c)
        {
            Console.WriteLine("a is highest!");
        }
        else if (b > a && b > c)
        {
            Console.WriteLine("b is highest!");
        }
        else if (c > a && c > b)
        {
            Console.WriteLine("c is highest!");
        }
        else
        {
            Console.WriteLine("Um, I don't know...");
        }
​
        // Q1: Write an if statement, as concisely as possible, that prints
        // 'one of the numbers is negative' if ANY ONE of the numbers are negative
        if (a < 0 || b < 0 || c < 0)
        {
            Console.WriteLine("One of the numbers is negative");
        }
​
        // Q2: Write code that will identify if AT LEAST TWO of the three numbers is EVEN
        // The code should print "Two of the numbers are even!"
        int numberOfEven = 0;
        if (a % 2 == 0)
        {
            numberOfEven++;
        }
        if (b % 2 == 0)
        {
            numberOfEven++;
        }
        if (c % 2 == 0)
        {
            numberOfEven++;
        }
        if (numberOfEven > 1)
        {
            Console.WriteLine("At least 2 of the 3 numbers is even!");
        }
​
        // Switch/case
​
        // Before we look into this
        // One more if/else example to explain why need switch/case...
​
        int mood = 3;
        if (mood == 1)
        {
            Console.WriteLine("Feeling great!");
        }
        else if (mood == 2)
        {
            Console.WriteLine("Feeling so-so!");
        }
        else if (mood == 3)
        {
            Console.WriteLine("Feeling down!");
        }
        else
        {
            Console.WriteLine("Invalid input!");
        }
​
        // ... when the number of if/else statements gets a bit large (say, about 4-5 statements)
        // We should consider using switch/case because it *can* be more readable
​
        mood = 10;
        switch (mood)
        {
            case 1:
                Console.WriteLine("Feeling great!");
                break;
            case 2:
                Console.WriteLine("Feeling so-so!");
                break;
            case 3:
                Console.WriteLine("Feeling down!");
                break;
            default: // else
                Console.WriteLine("Invalid input!");
                break;
        }
​
        // Here is another way we can use switch/case
        // This demonstrates fall-through
        Console.WriteLine("A funny switch/case");
        int someNumber = -234;
        switch (someNumber)
        {
            case 0:
            // It is 0, but case 3 gets executed!
            case 1:
            case 2:
            case 3:
                Console.WriteLine("The number is less than 4");
                break; // This is a bit like: someNumber == 1 || someNumber == 2 || someNumber == 3
            case 4:
            case 5:
                Console.WriteLine("The number is 4 or 5");
                break;
            // It is best practice to always have a default case in a switch block
            default:
                Console.WriteLine("The number is negative OR greater than 5!");
                break;
​
        }
        string Tri1 = Console.ReadLine();
        string Tri2 = Console.ReadLine();
        string Tri3 = Console.ReadLine();
        
        checkParse(Tri1);
        checkParse(Tri2);
        checkParse(Tri3);       
        
        if (Tri1 + Tri2 + Tri3 == 180) {
            Console.WriteLine("This is a Valid triangle");
        } else {
            Console.WriteLine("This is an INVALID triangle");
        }
        
//• Write a program which asks a user to enter three integers representing the internal angle measurements of a possible triangle. The program should the print whether the angles are from a valid triangle. (Do you remember the internal angle sum of a triangle?)
//• Recall the class practice question to write a method which tests if a char is vowel or a consonant. Write a switch/case version of this code. Experiment with letting cases fall into each other (see the above example).
//• Write a program which asks the use to input any positive integer. Your program should then print a day of the week corresponding to that number.
//      o Examples of required input and output:
//      ▪ 0 -> Print “Monday”
//      ▪ 3 -> Print “Wednesday”
//      ▪ 7 -> Print “Monday”
//      ▪ 8 -> Print “Tuesday”
//      ▪ 25 -> Print “Friday”      
        
        
        
        
        
    }
}

Compilation error (line 23, col 14): Extension method must be defined in a non-generic static class
Compilation error (line 212, col 21): Inconsistent accessibility: return type 'Program.Order' is less accessible than method 'Program.FindLastDeliveredOrderAfterFirstOfMonth(List<Program.Order>)'
Compilation error (line 212, col 21): Inconsistent accessibility: parameter type 'List<Program.Order>' is less accessible than method 'Program.FindLastDeliveredOrderAfterFirstOfMonth(List<Program.Order>)'
Compilation error (line 172, col 40): 'Dictionary<string, string>' does not contain a definition for 'GetValueOrNull' and no accessible extension method 'GetValueOrNull' accepting a first argument of type 'Dictionary<string, string>' could be found (are you missing a using directive or an assembly reference?)
Compilation error (line 173, col 38): 'Dictionary<string, string>' does not contain a definition for 'GetValueOrNull' and no accessible extension method 'GetValueOrNull' accepting a first argument of type 'Dictionary<string, string>' could be found (are you missing a using directive or an assembly reference?)
Compilation error (line 203, col 29): 'Program.Order.status' is inaccessible due to its protection level
Compilation error (line 204, col 29): 'Program.Order.status' is inaccessible due to its protection level
Compilation error (line 205, col 29): 'Program.Order.status' is inaccessible due to its protection level
Compilation error (line 216, col 80): 'Program.Order.status' is inaccessible due to its protection level
Compilation error (line 238, col 29): 'Program.Order.status' is inaccessible due to its protection level
Compilation error (line 239, col 29): 'Program.Order.status' is inaccessible due to its protection level
Compilation error (line 240, col 29): 'Program.Order.status' is inaccessible due to its protection level
Compilation error (line 244, col 80): 'Program.Order.status' is inaccessible due to its protection level
Compilation error (line 263, col 13): 'Program.Order.status' is inaccessible due to its protection level
Compilation error (line 278, col 19): 'Program.Order.status' is inaccessible due to its protection level
Compilation error (line 280, col 19): 'Program.Order.status' is inaccessible due to its protection level
Compilation error (line 283, col 29): 'Program.Order.status' is inaccessible due to its protection level

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