L3. Operators in JS, CSE 202, BN11.pdf JavaScript

Course Code: CSE 202
Course Title: Computer Programming Lab
Lecture 3: Operators in JS
Course Teacher: Saurav Barua (SB)
Assistant Professor, Dept. of CE, DIU
Phone: +88-01715334075
Email: saurav.ce@diu.edu.bd

Contents
2
Logical
operators
Arithmetic
operator
Assignment
operator
Comparison
operator
Types of
operators
.
Ternary operator

Types of operators
3
There are different types of JavaScript operators:
1. Arithmetic Operators
2. Assignment Operators
3. Comparison Operators
4. String Operators
5. Logical Operators
6. Bitwise Operators
7. Ternary Operators
8. Type Operators

Arithmetic operator
4
Operator Description
+ Addition
- Subtraction
* Multiplication
** Exponentiation (ES2016)
/ Division
% Modulus (Division Remainder)
++ Increment
-- Decrement

Arithmetic operator
5
 i++ stands for i= i+1
 % stands for reminder. Example: 6%4 = 2.

Assignment operator
6
Operator Example Same As
= x = y x = y
+= x += y x = x + y
-= x -= y x = x - y
*= x *= y x = x * y
/= x /= y x = x / y
%= x %= y x = x % y
**= x **= y x = x ** y

Comparison operator
7
Operator Description
== equal to
=== equal value and equal type
!= not equal
!== not equal value or not equal type
> greater than
< less than
>= greater than or equal to
<= less than or equal to
? ternary operator

Comparison operator
8
 20==“20”. //output: True. == only check value.
 20===“20”. //output: False. === check value and data type.
Syntax for ternary operator:
condition ? exprIfTrue : exprIfFalse
Example:
const age = 26;
const beverage = age >= 5 ? “Coke" : "Juice";
console.log(beverage); // output: Coke
Syntax:
variablename = (condition) ? value1:value2
Example: let voteable = (age < 18) ? "Too young":"Old enough";

Logical operator
9
Operator Description Example
&& and (x < 10 && y > 1) is true
|| or (x == 5 || y == 5) is false
! not !(x == y) is true

logical operator
10
Logical operator only return true (1) or false (0).
 Evaluate: (2<3)&&(4>2||3<2)
 Evaluate: (!1&&2>=3)||(3<4)

Worked out example
11
Example 3: Program to take input from prompt and calculate through JS and
display in the browser. (Calculate area of a triangle, take length and height as an
input through prompt and display in the browser.)
Google drive link:
https://drive.google.com/drive/folders/1DNqm-
2rFkuRJXg5Cb6PMa9fgd82mE-pD?usp=drive_link
Git-hub link: https://github.com/sauravbarua02/triangleAreaCalculation

html codes
13
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport"
content="width=device-width, initial-
scale=1.0">
<title>LogicControl</title>
<link rel="stylesheet" href="style.css">
</head>
<body>
<div class="container"
id="container">
<div id="result"></div>
<script src="app.js"></script>
</div>
</body>
</html>

css codes
14
body{
margin: 0px;
background-color: rgba(90,90,230,0.6);
}
.container{
background-color: rgba(90,90,230,0.3);
width: 300px;
height: 300px;
margin: 20px auto;
padding: 10px;
display: flex;
flex-direction: column;
justify-content: center;
align-items: center;
border-radius: 10px;
box-shadow: 0 0 3px 1px rgba(0,0,0,0.5);
font-size: large;
}

JS codes
15
const resultEl =
document.getElementById("result");
const length = prompt("Enter length in meter
= ");
const height = prompt("Enter height in meter
= ");
function areaCal(){
const area = 0.5*length*height;
resultEl.innerText = "Area of the
triangle: " + area + " sq. meter";
}
areaCal();

Class tasks
16
Task 3.1: Program to calculate average penetration in mm from three bitumen
samples in the bitumen penetration test. Take penetration values as input and
display average value in the browser. (hints: average = (val1 + val2 +val3)/3)
Task 3.2: Program to calculate area of a rectangular industrial plot. Take width and
breadth as input and display area (sq. ft) in the browser. (hints: areaRectangle = width x
breadth)
Task 3.3: Program to calculate discharge of an irrigation canal. Take cross-section and
water velocity as input and display discharge (cum/sec) in the browser. (hints:
discharge= crossSection x velocity)
Task 3.4: Program to calculate delay in a signalized intersection. Take travel time and
free flow travel time as input and display delay (sec) in the browser.(hints: delay =
travelTime – freeFlowTravelTime)
Task 3.5: Program to calculate maximum bending moment of a simply supported
beam under UDL . Take UDL and span length as input and display moment (kip-ft) in
the browser.(hints: maxMoment = 1/8 x UDL x span x span)

L3. Operators in JS, CSE 202, BN11.pdf JavaScript

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