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For Looping In Java Script

This loop contains the initial value, termination value , increment/decrement value in a single line, which in on other looping are used in separate line, the scope of a for loop is inside the curly bracketsused with it. The initialization segment is executed only once at the start of the loop and terminationand increment/decrement segments are executed every time till the condition remains true.
 
syntax:
 
for(initialization; termination; increment/decrement)

{

code to be executed

}

 
Example
 
<html>

<head>

</head>

<body>

<script type=”text/javascript”>

var a;

for(a=100;a>0;a-=5)

{

document.write(” “+a)

}

</script>

</body>

</html>

 
Understanding program :
Value of a is initially 100 , the condition with for loop is while a is greater 0 the statements typed should be executed. a-=5 means a=a-5, so the a will get decremented with 5 every time. As soon as a becomes 0 the loop gets terminated.
 
Output:
100 95 90 85 80 75 70 65 60 55 50 45 40 35 30 25 20 15 10 5

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