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 :
Using readline() Function
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.
s = readline()
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.
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.
Using readlines() Function
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.
lines = readlines()
Example 1: Reading N lines of input from STDIN
In 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.
In the below example we input N lines and display the entries by prefixing with their entry numbers.