- Write a Ruby program.
We're going to build a simple program that implements only the very first thing a complete Tic Tac Toe program would require, which is to greet the player with a welcome message.
- Run the tests.
- Read the output.
- Code the solution in
lib/welcome.rb
. - Run the tests.
- Read the output.
- If still broken, repeat 3-5.
- If passing, submit using CodeGrade.
Here are some things you can try to get more clues to solve the lab.
When you run ruby lib/welcome.rb
from your terminal you are asking the Ruby
interpreter to run your program. If you see no output, like below, that means
there is no code in lib/welcome.rb
to print "Welcome to Tic Tac Toe!".
Note: The file welcome.rb
already exists in the folder lib
.
The solution to this is to make sure you have puts "Welcome to Tic Tac Toe!"
in lib/welcome.rb
. A working program should look like:
Hint: Make sure you've saved lib/welcome.rb
.
When you run the tests you might see failing tests even though your program seemingly works. The failures might read something like:
1) lib/welcome.rb prints "Welcome to Tic Tac Toe!"
Failure/Error: load './lib/welcome.rb'
#<IO:0x007fa2b28325a0> received :puts with unexpected arguments
expected: ("Welcome to Tic Tac Toe!")
got: ("Welcome to Tic Tac Toe")
# ./lib/welcome.rb:4:in `puts'
An error like this is telling you that the test expects you to print "Welcome to Tic Tac Toe!"
, but you printed something else. Programming is absolutely
precise, make sure your tests are printing exactly "Welcome to Tic Tac Toe!".