Control Flow

Contents

Control Flow#

Learning Objectives#

Understand and use conditions statement (if, else, else if) in Julia
Implement for and while loops to execute repetitive tasks
Recognize how control flow structures are used to manage the execution of code based on conditions
Write programs that use loops and conditional statement to solve problems
Understand the syntax and applications of different control flow constructs in Julia

Conditional Statements#

Julia uses if, else, and elseif to allow your program to execute different sections of code based on whether a coniditon (or set of conditions) is true or false. For example the code below will determine if a given number is negative, positive or zero.

x = 100
println("Value equals ", x)
if x < 0
    println("The value is negative!")
elseif x == 0
    println("The value is zero!")
else
    println("The value is positive!")
end

Value equals 100
The value is positive!

Loops#

Loops are used to repeat a block of code multiple tims. Two common types of loop are, for and while. A for loop is used to iterate over a range or collection.

# Print the values 1 through 5.
for i in 1:5
    println(i)
end

A while loop repeats as long as a certain condition is true.

# Prints the values from 5 down to 1 
x = 5 
while x > 0
    println(x)
    x -= 1 # Decrease the value of x by 1 on each iteration
end