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4.22 DECISION MAKING
Decision making in JavaScript is done by called conditional statements which decide the flow of program execution.
The following conditional statements are available in JavaScript:
Ð Ðif statement
Ð Ðif...else statement
Ð ÐNested if statement
Ð ÐSwitch statement
The if Statement
The if statement is the simplest conditional statement. Here, a statement or a collection of statements within the if
block is executed only if a certain condition or expression evaluates to true. If the condition evaluates to false, then the
control of execution is passed to the next statement after the if block. The syntax of the if statement is given below:
if (condition) {
// block of code to be executed when the condition is true
}
Flow diagram:
Start
if False
condition
True
Statements
Stop
Example:
<!DOCTYPE HTML>
<HTML>
<HEAD>
<TITLE> if statement </TITLE>
</HEAD>
<BODY>
<SCRIPT>
var num = parseInt(prompt("Enter the number: "));
JavaScript Part 1 355

