Conditional statements:
These statements are used to execute a block of code
(statements) based on a condition.
1.
If statement
2.
If..else statement
3.
Switch statements
Iterative statements
1.
While
2.
Do..while()
3.
For()
1. if statement:
it is executed only when the condition is true
syntax:
if(condition)
{
statement;
}
Ex:
<html>
<head>
<script type="text/javascript">
if(2<7)
{
document.write("2 is smaller value");
}
</script>
</head>
</html>
If the condition is true we execute if block otherwise we execute 'else' block.
syntax:
if(condition)
{
statement1;
}
else
{
statement2;
}
Ex:
<html>
<head>
<script type="text/javascript">
if(2<1)
{
document.write("2 is smaller value");
}
else
{
document.write("2 is bigger value");
}
</script>
<head>
</html>
1. if statement:
it is executed only when the condition is true
syntax:
if(condition)
{
statement;
}
Ex:
<html>
<head>
<script type="text/javascript">
if(2<7)
{
document.write("2 is smaller value");
}
</script>
</head>
</html>
2. if..else statements
syntax:
if(condition)
{
statement1;
}
else
{
statement2;
}
Ex:
<html>
<head>
<script type="text/javascript">
if(2<1)
{
document.write("2 is smaller value");
}
else
{
document.write("2 is bigger value");
}
</script>
<head>
</html>
3. switch statement
the switch statement is used to execute a block of code from multiple blocks of codes.
Ex:
<html>
<head>
<script type="text/javascript">
var no=parseInt(prompt("enter a number"));
switch(no)
{
case 1: document.write("one");
break;
case 2: document.write("two");
break;
case 3: document.write("three");
break;
default: document.write("default");
}
</script>
</head>
</html>
output:
if you type any number (ex: 1)
it displays like below
Iterating statements:
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