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Decision Making

Decision making structures require that the programmer 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 true, and optionally, other statements to be executed if the condition is determined to be false.

Following is the general from of a typical decision making structure found in most of the programming languages:

decision making statements in c#

C# provides following types of decision making statements. Click the following links to check their detail.

if statementAn if statement consists of a boolean expression followed by one or more statements.
if...else statementAn if statement can be followed by an optional else statement, which executes when the boolean expression is false.
nested if statementsYou can use one if or else if statement inside another if or else if statement(s).
switch statementA switch statement allows a variable to be tested for equality against a list of values.
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 like this: 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.


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