Practice: Data Types and Arithmetic Operators

Overview

The following examples demonstrate using data types, arithmetic operations, and input in JavaScript statements.

Source: Dave Braunschweig, https://press.rebus.community/programmingfundamentals/chapter/javascript-examples-2/
This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 License.

Data Types

// This program demonstrates variables, literal constants, and data types.

var n;
var s;
var b;
    
n = 1.23456789012345;
s = "string";
b = true;
    
output("Number n = " + n);
output("String s = " + s);
output("Boolean b = " + b);

// Display output to the current environment
function output(text) {
  if (typeof document === 'object') {
    document.write(text);
  } 
  else if (typeof console === 'object') {
    console.log(text);
  } 
  else {
    print(text);
  }
}

Output

Number n = 1.23456789012345
String s = string
Boolean b = true

Discussion

Each code element represents:

• // begins a comment
• var n, s, and b define variables
• ; ends each line of JavaScript code
• i = , d = , s =, b = assign literal values to the corresponding variables
• output() calls the output function
• function output(text) defines a output function that checks the JavaScript environment and writes to the current document, the console, or standard output as appropriate.

Arithmetic

// This program demonstrates arithmetic operations.

var a;
var b;
    
a = 3;
b = 2;
output("a = " + a);
output("b = " + b);
output("a + b = " + (a + b));
output("a - b = " + (a - b));
output("a * b = " + a * b);
output("a / b = " + a / b);
output("a % b = " + (a % b));

// Display output to the current environment
function output(text) {
  if (typeof document === 'object') {
    document.write(text);
  } 
  else if (typeof console === 'object') {
    console.log(text);
  } 
  else {
    print(text);
  }
}

Output

a = 3
b = 2
a + b = 5
a - b = 1
a * b = 6
a / b = 1.5
a % b = 1

Discussion

Each new code element represents:

• +, -, *, /, and % represent addition, subtraction, multiplication, division, and modulus, respectively.