W3Schools.com


  
HOME HTML CSS XML JAVASCRIPT ASP PHP SQL MORE... REFERENCES | EXAMPLES | FORUM | ABOUT

JavaScript Operators

« Previous Next Chapter »

= is used to assign values.

+ is used to add values.


The assignment operator = is used to assign values to JavaScript variables.

The arithmetic operator + is used to add values together.

y=5;
z=2;
x=y+z;

The value of x, after the execution of the statements above is 7.


JavaScript Arithmetic Operators

Arithmetic operators are used to perform arithmetic between variables and/or values.

Given that y=5, the table below explains the arithmetic operators:

Operator Description Example Result
+ Addition x=y+2 x=7
- Subtraction x=y-2 x=3
* Multiplication x=y*2 x=10
/ Division x=y/2 x=2.5
% Modulus (division remainder) x=y%2 x=1
++ Increment x=++y x=6
-- Decrement x=--y x=4


JavaScript Assignment Operators

Assignment operators are used to assign values to JavaScript variables.

Given that x=10 and y=5, the table below explains the assignment operators:

Operator Example Same As Result
= x=y   x=5
+= x+=y x=x+y x=15
-= x-=y x=x-y x=5
*= x*=y x=x*y x=50
/= x/=y x=x/y x=2
%= x%=y x=x%y x=0


The + Operator Used on Strings

The + operator can also be used to add string variables or text values together.

To add two or more string variables together, use the + operator.

txt1="What a very";
txt2="nice day";
txt3=txt1+txt2;

After the execution of the statements above, the variable txt3 contains "What a verynice day".

To add a space between the two strings, insert a space into one of the strings:

txt1="What a very ";
txt2="nice day";
txt3=txt1+txt2;

or insert a space into the expression:

txt1="What a very";
txt2="nice day";
txt3=txt1+" "+txt2;

After the execution of the statements above, the variable txt3 contains:

"What a very nice day"


Adding Strings and Numbers

The rule is: If you add a number and a string, the result will be a string!

Example

x=5+5;
document.write(x);

x="5"+"5";
document.write(x);

x=5+"5";
document.write(x);

x="5"+5;
document.write(x);

Try it yourself »

« Previous Next Chapter »


Website Templates Hot Price

Premium Website Templates

Over 6,000+ Amazing Designs. Just $59.95/year!

Download over 6,000+ Amazing Website Templates, Flash Templates, Office Templates, Brochures, Wordpress Themes, Corporate ID Kits, Vectors and More!

Signup Now!

Signup now! Instant Account Activation

Google Places

Google Coupon  Get 30 days of free advertising with Google Tags
For a limited time sign up for Google Tags and get your first 30 days free.

Tags are yellow markers that allow business owners to promote important aspects of their businesses. Scroll over tags on Google or click on the sponsored link to view coupons, photos, or other select features.

Google People  Get more customers
by promoting features that
make your business unique

Google Clock  Save time advertising
with our easy tag builder,
ready in minutes

Google Money  Control your budget
with a $25/month flat fee

         Google People

Click here to get started Click Here


WEB HOSTING
Best Web Hosting
PHP MySQL Hosting
Top 10 Web Hosting
UK Reseller Hosting
Web Hosting
Top Web Hosting
$1 Domain Sale
WEB BUILDING
XML Editor – Free Trial!
FREE Flash Website
6,000+ HTML Templates
Download now (FREE)
Advertise on Google
Stand out on Google search and maps Click Here
W3SCHOOLS EXAMS
Get Certified in:
HTML, CSS, JavaScript, XML, PHP, and ASP
W3SCHOOLS BOOKS
New Books:
HTML, CSS
JavaScript, and Ajax
STATISTICS
Browser Statistics
Browser OS
Browser Display
SHARE THIS PAGE