Julia - Quiz 1

Who created Julia programming language?

• Guido van Rossum
  

• James Gosling

• Jeff Bezanson, Stefan Karpinski, and Viral B. Shah

• Brendan Eich

What is the file extension for a Julia program?

• .jl
  

• .py

• .java

• .js

What is the syntax for declaring a variable in Julia?

• var x = 10
  

• int x = 10

• x = 10

• declare x = 10

Answer explanation

In Julia, variables are declared by simply assigning a value to them, for example, “x = 10”.

What is the syntax for a while loop in Julia?

• while x < 10 do
  # code here
  end
  
  

• while x < 10 {
  # code here
  }

• while x < 10:
  # code here

• while x < 10
  # code here
  end

Answer explanation

In Julia, a while loop is written as “while condition do … end”.

What is the syntax for a function in Julia?

• function my_function(arg1, arg2)
  # code here
  end
  

• def my_function(arg1, arg2):
  # code here

• void my_function(arg1, arg2) {
  # code here
  }

• sub my_function(arg1, arg2) {
  # code here
  }

Answer explanation

In Julia, a function is written as “function function_name(arguments) … end”.

x = 5
y = “Hello”
println(“$y, the value of x is $x.”)

• $y, the value of x is 5.

• Hello, the value of x is $x.

• Hello, the value of x is 5.

• $y, the value of x is $x.

Answer explanation

The code uses string interpolation to insert the values of the variables “x” and “y” into the string that is printed.

What is the output of the following Julia code?

x = 1
while x <= 10
println(x)
x += 1
end

• 1 3 5 7 9

• 1 2 3 4 5 6 7 8 9 10
  

• 10 9 8 7 6 5 4 3 2 1

• No output

Answer explanation

The code uses a while loop to print the numbers from 1 to 10.

What is the output of the following Julia code?

function my_function(x)
return x * 2
end
y = my_function(5)
println(y)

• 2

• 10

• 25

• 5

Answer explanation

The code defines a function called “my_function” that takes one argument and returns its value multiplied by 2. The function is then called with an argument of 5, and the result is stored in a variable called “y” and printed.

What is the output of the following Julia code?

a = [1, 2, 3, 4, 5]
println(a[3])

• [3]
  

• 3

• [4]

• 4

Answer explanation

The code declares an array “a” containing the values 1 through 5, and then prints the third element of the array, which is 3.

What is the output of the following Julia code?

a = [1, 2, 3, 4, 5]
b = a[2:4]
println(b)

• [1, 2, 3, 4, 5]
  
  

• [3, 4, 5]

• [2, 4]

• [2, 3, 4]

Answer explanation

The code declares an array “a” containing the values 1 through 5, and then creates a new array “b” containing the elements of “a” from the second through the fourth index. The array “b” is then printed.