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.