Ruby Print Variable Content

The ruby print function is used to display output on the screen.

Ruby print variable content.

The default value is. A variable in ruby can be distinguished by the characters at the start of its name. To store a string in a variable define the variable name and assign the string s value. Here is an example.

Usr bin ruby str hello ruby putc str this will produce the following result h the print statement. Global variable in class1 is 10 global variable in class2 is 10 ruby instance variables. Getting started with ruby string formatting. To use printf you have to define a list of format specifiers and a list of variables or values.

The print statement is similar to the puts statement. The destination of output for kernel print and kernel printf. Puts 123 puts 456 puts 789 123 456 789 every message has its own line. While sprintf is also available in ruby in this post we will use a more idiomatic way for some reason the community style guide doesn t seem to agree on this but i think that s ok.

My string this is my string then to retrieve the value use the variable s name. If you don t want a newline then use print. Note in ruby you can access value of any variable or constant by putting a hash character just before that variable or constant. The only difference is that the puts statement goes to the next line after printing the contents whereas with the print statement the cursor is positioned on the same line.

For each element in the sharks array ruby assigns that element to the local variable shark. These are contents of capturing groups for regular expression matches. The string or integer value to be printed is passed as an argument to this function. Usr bin ruby f file open stones txt while line f gets do puts line end f close the example opens a file called stones txt and print its contents line by line to the terminal.

Variables are a named reference to a place in the computer s memory. However puts automatically inserts a newline at the end of the line being printed. You use variables to store data and retrieve it later. We can then print the element s value using puts.

Instance variables begin with commat. Note that print does not do the same. The default mode is a read mode. There s no restriction to the length of a variable s name with the exception of the heap size.

Ruby arrays are objects and they provide the each method for working with elements. You won t see for in very often though. Puts also treats arrays in a different way. Print 123 print 456 print 789 123456789 but if you use puts.

Print 123 the next time you print something it will be one the same line as your last message. The stones file contains nine names of valued stones each on a separate line.