CS Decision-Making

What is Decision-Making in C#?

C# provides numerous declarations on decision making to help the C # Program flow under certain logical conditions. The following statements are included in the C # decision making.

Decision making structures will require the programmer to specify one or more program conditions for evaluation or testing, together with a statement or statements to be made if the requirement is determined to be true, and optionally, if the situation is determined to be incorrect, other statements will be performed.

• if statement
• if-else statement
• else if statement

 

This is followed by the typical structure of decision-making in most programming languages:

 

C# If Statement

The C# if statement checks the condition. If condition is true it is executed.

Syntax:

if(condition){  
//code to be executed  
}  

 

Example:

    using System;      
    public class IfExample  
        {  
           public static void Main(string[] args)  
            {  
                int num = 20;  
                if (num % 2 == 0)  
                {  
                    Console.WriteLine("It is even number");  
                }  
                  
            }  
        }  

 

C# If-else Statement

The C# if-else statement also checks the condition. If the condition is true then, if statement execute otherwise (if condition is false), else block statement execute.

Syntax:

if(condition){  
//code if condition is true  
}else{  
//code if condition is false  
}  

 

Example:

    using System;      
    public class IfExample  
        {  
            public static void Main(string[] args)  
            {  
                int num = 15;  
                if (num % 2 == 0)  
                {  
                    Console.WriteLine("It is even number");  
                }  
                else  
                {  
                    Console.WriteLine("It is odd number");  
                }  
                  
            }  
        }  

 

C# else-If statement

If we want to check another condition in the else part, the ' If ' statement can follow an ' else ' statement as well.

Syntax:

if(condition1){  
//code to be executed if condition1 is true  
}else if(condition2){  
//code to be executed if condition2 is true  
}  
else if(condition3){  
//code to be executed if condition3 is true  
}  
...  
else{  
//code to be executed if all the conditions are false  
}  

Example:

using System;

namespace DecisionMaking {
   class Program {
      static void Main(string[] args) {
         //* local variable definition */
         int a = 100;
         int b = 200;
         
         /* check the boolean condition */
         if (a == 100) {
            
            /* if condition is true then check the following */
            if (b == 200) {
               /* if condition is true then print the following */
               Console.WriteLine("Value of a is 100 and b is 200");
            }
         }
         Console.WriteLine("Exact value of a is : {0}", a);
         Console.WriteLine("Exact value of b is : {0}", b);
         Console.ReadLine();
      }
   }
}

 

 

C# switch case

The switch case in C# execute one statement from several conditions. It is like a if-else-if command in C#.

Syntax:

switch(expression){    
case value1:    
 //code to be executed;    
 break;  
case value2:    
 //code to be executed;    
 break;  
......    
    
default:     
 //code to be executed if all cases are not matched;    
 break;  
}    

Example:

using System;

namespace SwitchCaseExample {
   class Program {
      static void Main(string[] args) {
         /* local variable definition */
         char grade = 'B';
         
         switch (grade) {
            case 'A':
               Console.WriteLine("Excellent!");
               break;
            case 'B':
            case 'C':
               Console.WriteLine("Well Done");
               break;
            case 'D':
               Console.WriteLine("You Passed");
               break;
            case 'F':
               Console.WriteLine("Better Try Again");
               break;
               default:
            Console.WriteLine("Invalid Grade");
               break;
         }
         Console.WriteLine("Your grade is  {0}", grade);
         Console.ReadLine();
      }
   }
}