Decision making structures requires the programmer to specify one or more conditions to be evaluated or tested by the program, along with a statement or statements to be executed if the condition is determined to be executed if the condition is determined to be false.
Following is the general form of a typical decision making structure found in most of the programming languages −
C# provides following types of decision making statements. Click the following links to check their detail.
|Sr.No.||Statement & Description|
|1||if statementAn if statement consists of a boolean expression followed by one or more statements.|
|2||if…else statementAn if statement can be followed by an optional else statement, which executes when the boolean expression is false.|
|3||nested if statementsYou can use one if or else if statement inside another if or else ifstatement(s).|
|4||switch statementA switch statement allows a variable to be tested for equality against a list of values.|
|5||nested switch statementsYou can use one switch statement inside another switch statement(s).|
The ? : Operator
We have covered conditional operator ? : in previous chapter which can be used to replace if…else statements. It has the following general form −
Exp1 ? Exp2 : Exp3;
Where Exp1, Exp2, and Exp3 are expressions. Notice the use and placement of the colon.
The value of a ? expression is determined as follows: Exp1 is evaluated. If it is true, then Exp2 is evaluated and becomes the value of the entire ? expression. If Exp1 is false, then Exp3 is evaluated and its value becomes the value of the expression.