C Sharp Programming/Keywords/if

Keywords if The if keyword identifies an if statement with the following syntax: if-statement ::= "if" "(" condition ")" if-body ["else" else-body] condition ::= boolean-expression if-body ::= statement-or-statement-block else-body ::= statement-or-statement-block If the condition evaluates to true, the if-body executes. Curly braces ("{" and "}") allow the if-body to contain more than one statement. Optionally, an else clause can immediately follow the if-body, providing code to execute when the condition is false. Making the else-body another if statement creates the common cascade of if, else if, else if, else if, else statements: using System; public class IfStatementSample { public void IfMyNumberIs() { int myNumber = 5; if (myNumber == 4) Console.WriteLine("This will not be shown because myNumber is not 4."); else if(myNumber < 0) { Console.WriteLine("This will not be shown because myNumber is not negative."); } else if(myNumber%2 == 0) Console.WriteLine("This will not be shown because myNumber is not even."); else { Console.WriteLine("myNumber does not match the coded conditions, so this sentence will be shown!"); } } } The boolean expression used in an if statement typically contains one or more of the following operators: OperatorMeaningOperatorMeaning < less than > greater than == equal to != not equal to <= less than or equal to >= greater than or equal to && and || or ! not See also else.