Taking Input from Users in Julia

28 Jul, 2020
Reading user input is a way of interaction between the program and the user. User inputs are necessary in case of testing a piece of code with varying and legitimate inputs.
Reading user inputs from console in Julia can be done through inbuilt I/O methods like :
readline()
readlines()
readline() method reads a line of text from the input stream (STDIN) until a ‘\n’ (newline) character is encountered. The input is read as String data.
Syntax:
s = readline()

Example 1:In the below example, user input is obtained using the readline() method. We can prompt the user with the help of a print statement prior. It is to be noted that readline method reads the input into a string data type.
# Julia program to take input from user  # prompt to inputprint("What's your name ? \n\n")   # Calling rdeadline() functionname = readline()  println("The name is ", name)print("\n\n")  # typeof() determines the datatype.println("Type of the input is: ", typeof(name)) 
Output :
Example 2: Reading numerical data types from console
The below example demonstrates how to read inputs as numbers and make use of them in further computations. This is done using the parse() method, using which we can convert a numeric string(Float or Int) into a numerical value.
# Julia program to calculate sum of # 5 integers obtained from console/user input  result = 0  # Prompt to enterprintln("Enter 5 numbers line by line")  # Taking Input from userfor number in 1:5      num = readline()   num = parse(Int64, num)    global result+= num    end  println("The sum is :", result)
Output:
readlines() method is used to read N lines of text input from the console. N lines are stored as the entries of a one-dimensional String array. Here lines must be delimited with newline character or by pressing the “ENTER” key. To stop taking Input press Ctrl-D.
Syntax:
lines = readlines()

Example 1: Reading N lines of input from STDINIn the below example N-lines of input are obtained and stored within a 1-D String Array. We can access the desired line using it’s index.
# Julia program to take # multi-lined input from user  line_count = 0  println("Enter multi-lined text, press Ctrl-D when done")  # Calling readlines() functionlines = readlines()  # Loop to count linesfor line in lines       global line_count += 1   end  println("total no.of.lines : ", line_count)  println(lines)  # Getting type of Input valuesprintln("type of input: ", typeof(lines))
Output:
In the below example we input N lines and display the entries by prefixing with their entry numbers.
line_number = 1  println("Enter few paragraphs")  print("\n")  lines = readlines()  println()  for line in lines       println(line_number, ". ", line)   global line_number += 1   end
Output:
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