2. Performing Mathematical Calculations

3. JavaScript Arithmetic Operators
• Arithmetic operators are used to perform
mathematical calculations on variables and/or
values. These operators are combined with
values and/or variables to form a JavaScript
expression.
• A symbol or other character indicating an
operation that acts on one or more elements.
• The different JavaScript arithmetic operators
are listed as follows:

4. Arithmetic Operators
Operator Description
+ Addition
- Subtraction
* Multiplication
/ Division
% Modulus (remainder of a division)
++ Increment
-- Decrement

5. Web browser result: 10 + y= 22
Explanation:
var (means variable, optional) This are used to hold values and
expressions.
let variable y = 12.
Mathematical expression= let variable x= 10 + y (where y is
equal to 12)
document .write display the result: 10 + y= 22

6. <script>
msg1= “My Birthday is”
msg2= “December 25, 1972”
msg3= msg1 + msg2;
alert(“ ”+msg3+””)
</script>
Web browser result:
Explanation:
The (+) operator add string variables or text values
together.

7. If you add a numeric value and a text or string
value, the result will be a text or string
Examples:
Statement Result
z= 10+5; 15
z= “3”+ “3”; 33
z= 8+ “15”; 815
z= “11”+12; 1112

8. • <script>
• z="13"+"13";
• x= 13+13;
• document.write(""+z+"");
• alert(""+x+"");
• </script>
• Result= 1313 (because values on z are
considered as “text values”)
• Result= 26(because values on x are numeric
values)

9. • <script>
• var z= parseFloat("13");
• var x= 13
• var y= z + x;
• document.write(""+y+"");
• </script>
RESULT= z + x = 26
• The parseFloat() function parses a string and returns a floating
point number.
• This function determines if the first character in the specified
string is a number. If it is, it parses the string until it reaches the
end of the number, and returns the number as a number, not as
a string.
• Note: Only the first number in the string is returned!
• Note: Leading and trailing spaces are allowed.
• Note: If the first character cannot be converted to a number, parseFloat()
returns NaN.

10. COMPUQUIZ/EXERCISES
1. A symbol or other character indicating an
operation that acts on one or more elements.
2. This are used to hold values and expressions.
3. Write the code for the following:
variable x = 33
variable y= 10 + x
Put the result in an alert box