C# tutorial-Conditional statements-if else

C# conditional statements-if/else



-if/else statement

if statement will evaluate the condition. If it is true, it will execute the statements that follow it. Otherwise, it will execute the statements in else block.

if statement without else:

if (condition) {
    Statement
    Statement
}

Or

if statement with else: 

if (condition) {
  Statement
  Statement
}
else {
  Statement
  Statement
}
      Or
if (condition) {
  Statement
  Statement
}
else if {
  Statement
  Statement
}
 
else {
   Statement
   Statement
}
 

Example:

int age;
Console.WriteLine("Enter your age:");
age=int.Parse(Console.ReadLine());
if (age >= 18)
   Console.WriteLine("You can play the game.");

   else Console.WriteLine("You are not allowed to play the game.");

 

The below table is the list of operators which can be used in if/else statement.

Sign

Meaning

==

Equal

!=

Not equal

Greater than

>=

Greater than or equal to

Less than

<=

Less than or equal to

 

If you want to put more than one statements in an if/else statement then you must write them in curly brackets {}.

Example:

int age;
Console.WriteLine("Enter your age:");
age=int.Parse(Console.ReadLine());
if (age == 18)
{
   Console.WriteLine("You are 18 years old.");
   Console.WriteLine("You are allowed to play the game.");
}

Note: if/else statements can be nested.

 

Example:

string user, password;
Console.WriteLine("Enter username:");
user=Console.ReadLine();
Console.WriteLine("Enter password:");
password=Console.ReadLine();
if (user =="dara")
   if (password == "12345")
      Console.WriteLine("Welcome{0,8}!",user);

   else Console.WriteLine("Invalid password! Try again");

 

else Console.WriteLine("Invalid user name! Try again");

 

 If you want to evaluate more than one condition you can use many else if blocks as possible.

Example:

   Console.WriteLine("Enter a letter:");

      char c =(char)Console.Read();

      if (Char.IsDigit(c)==true)

         Console.WriteLine("A number");

      else if(char.IsLower(c)==true)

         Console.WriteLine("A lower case letter");

      else if(char.IsUpper(c)==true)

        Console.WriteLine("An upper case letter");




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