While-loop in Julia
While-loop is a control flow statement, used to execute a set of statements as long as this given control condition holds true. It falls under the indefinite iteration category.
Let’s understand while loop with a simple example.
Without the break keyword, the above while-loop would iterate up to 20. This loop is exited early by using a break statement.
You have seen how to break a loop over some specific condition with the break statement. What if you wish to continue a loop over some specific condition. Let’ see how to do that.
Q2. Find factorial of a number
Content
- Intorduction to While-loop in Julia
- Break Statement
- Continue Statement
- Practice Exercise
1. Introduction to While-loop in Julia
While-loop is a control flow statement, used to execute a set of statements as long as this given control condition holds true. It falls under the indefinite iteration category. When the number of iterations is not specified explicitly in advance, it’s called indefinite iteration. While-loop in Julia follows the similar syntax to the while-loop in Python and R. Anend statement is required to end the loop, this is the major difference as compared to that of Python and R
Let’s have a look at the syntax :
Syntax of a while loop
julia
while condition is true
# do something here
# make sure the logic breaks the condition at some point
# else results in infinite loop
end
julia
# Print all negative numbers greater than equal to the given number `-5`
num = -5
while num < 0
println(num)
num += 1
end
python
# Output :
-5
-4
-3
-2
-1
2. Break Statement
Break statement is a loop control statement, used to stop the while-loop even before the control statement becomes false. Let me explain it with an example.julia
# Print all the square numbers of 1 to 20, but make sure the squared numbers are less than 100
num = 1
while num < 20
sq_num = num*num
if sq_num > 100
break
end
println(sq_num)
num += 1
end
python
# Output :
1
4
9
16
25
36
49
64
81
100
3. Continue Statement
Continue statement is a loop control statement, used to stop an iteration and move to the next one immediately. Let me explain it with an example.julia
# Print all the multiples of 3 which are less than 10
num = 1
while num < 10
num += 1
if num % 3 != 0
continue
end
println(num)
end
python
# Output :
3
6
9
4. Practice Exercises
Q1. Count the total digits in a given numberjulia
num = 1236789
count = 0
while num != 0
num ÷= 10
count+= 1
end
println("Total digits are: ", count)
python
# Output :
Total digits are: 7
julia
num = 6
fac = 1
if num == 0
println(1)
else
while num >= 1
fac = fac*num
num -= 1
end
println(fac)
end
python
# Output :
720
Conclusion
So, now you should have a fair idea of how to execute while-loops in Julia. Next, I will see you with more Data Science oriented topics in Julia. Read more about Julia hereFree Course
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