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  • Types of Numbers
  • Arithmetic Operators
  • Comparison Operators and Functions
  • Exercises
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  1. Julia

Numbers and Math

This page provides syntax for using numbers and mathematic operations in Julia. Each section includes an example to demonstrate the described syntax and operations.

Types of Numbers

  • Integer (positive and negative counting number) - e.g., -3, -2, -1, 0, 1, 2, and 3

    • Signed: Int8, Int16, Int32, Int64, and Int128

    • Unsigned: UInt8, UInt16, UInt32, UInt64, and UInt128

    • Boolean: Bool (0 = False and 1 = True)

  • Float (real or floating point numbers) - e.g., -2.14, 0.0, and 3.777

    • Float16, Float32, Float64

Use typeof() function to determine type

Input:

# Define two variables x and y
x = 100
y = 3.14

# Print out the variable types for each
println(typeof(x))
println(typeof(y))

Output:

Int64
Float64

Arithmetic Operators

Operator
Example

Addition

x + y

Subtraction

x - y

Multiplication

x * y

Division

x / y

Power (Exponent)

x ^ y

Remainder (Modulo)

x % y

Negation (for Bool)

!x

Input:

# Demonstrates different math operations
using Printf

n1 = 7    # First number
n2 = 3    # Second number
 
# Output results of different math operations
println("$n1 + $n2 = $(n1 + n2)")             # Addition 
println("$n1 - $n2 = $(n1 - n2)")             # Subtraction 
println("$n1 * $n2 = $(n1 * n2)")             # Multiplication 
println("$n1 / $n2 = $(n1 / n2)")             # Division 
@printf("%d / %d = %.2f\n", n1, n2, n1 / n2)  # Print to 2 decimal places
println("$n1 ^ $n2 = $(n1 ^ n2)")             # Power/Exponent
println("$n1 % $n2 = $(n1 % n2)")             # Modulo/Remainder

Output:

7 + 3 = 10
7 - 3 = 4
7 * 3 = 21
7 / 3 = 2.3333333333333335
7 / 3 = 2.33
7 ^ 3 = 343
7 % 3 = 1

Comparison Operators and Functions

Input:

Operator
Example

Equality

x == y or isequal(x, y)

Inequality

x != y or !isequal (x, y)

Less than

x < y

Less than or equal to

x <= y

Greater than

x > y

Greater than or equal to

x >= y

# compare.jl                                                                                                 
# Demonstrate comparison operators                                                                               

# Assign values to variables using parallel assignment                                                           
c1, c2, c3, c4 = 25, 50, 75, 50
println("c1 = $(c1), c2 = $(c2), c3 = $(c3), c4 = $(c4)")

# Output results of different comparison operations                                                             
 
# Testing equality                                                                                               
println("  c1 = c3 is $(c1 == c3)")
println("  c2 = c4 is $(isequal(c2, c4))")

# Changing values using abbreviated assignment operators                                                        
c1 *= 3    	# Shorthand for c1 = c1 * 3                                                                       
c4 += 1    	# Shorthand for c4 = c4 + 1                                                                       

println("c1 = $(c1), c2 = $(c2), c3 = $(c3), c4 = $(c4)")
 
# Testing less than and greater than
println("  c1 < c2 is $(c1 < c2)")
println("  c4 <= c2 is $(c4 <= c2)")
println("  c1 > c2 is $(c1 > c2)")
println("  c3 >= c2 is $(c3 >= c2)")

Output:

c1 = 25, c2 = 50, c3 = 75, c4 = 50
  c1 = c3 is false
  c2 = c4 is true
c1 = 75, c2 = 50, c3 = 75, c4 = 51
  c1 < c2 is false
  c4 <= c2 is false
  c1 > c2 is true
  c3 >= c2 is true

Exercises

  • Create a Health Calculator Using Julia - Forthcoming!

Resources

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Last updated 6 months ago

Julia Documentation:

Julia Documentation:

Julia Documentation:

Julia Documentation:

Think Julia:

Integers and Floating Point Numbers
Mathematical Operations and Elementary Functions
Numbers
Mathematics
Chapter 1 - The Way of the Program