user enters and split them up into their relevant words. Although
understanding English might appear to be quite complex, in reality,
most early IF games took a simplified approach: every command was
assumed to be of the form verb noun.
Your task for this stage of the project is three-fold:
Using string and getline, accept input
(repeatedly) from the user and split it into the noun and verb
parts. At this level, you can assume that the user
will only type the noun and the verb, with one
or more spaces between them.
Support the following commands:
If you want to add extra commands beyond these, feel free,
however, any unrecognized commands should result in an error
message, such as
You don’t know how to do that.
Since there’s only one location at this point,
the go command should always print “You can’t go that
way.”.
You should only be able to get an object that you
haven’t already picked up, and likewise, you should only be able
to drop an object that you are already carrying.
Create an environment with one “room” (location) and one object.
At a minimum, the player should be able to pick up and drop the
object. You can make the “setting” of your game anything you like.
Both the location and object should have full descriptions so that
if you look at them they are described in detail.
- The First Stage Of The Project Is To Recognize The Commands The User Enters And Split Them Up Into Their Relevant Words 1 (56.76 KiB) Viewed 35 times
changes depending on whether or not we’re carrying the lamp.
Similarly, you can try to look at things like the rock
walls or the cave itself, and you get an error message. (But one
that tries not to break the immersion! Rather than saying “that’s
an error”, the game pretends that you can look
at anything, it’s just that most things aren’t “interesting”.)
The sample adds a command to light the lamp; the code has to
keep track of whether or not the lamp is lit, and adjust the
messages printed accordingly.
- The First Stage Of The Project Is To Recognize The Commands The User Enters And Split Them Up Into Their Relevant Words 2 (40.03 KiB) Viewed 35 times
don’t have to follow these hints if you want to structure your
program differently.)
Almost all of main will be
a while(true) loop.
Any variables which should keep their values from one “game
turn” to the next should be declared before the
loop. (Remember that variables declared inside a loop are “reset”
every time the loop runs.)
Use getline to get the player’s input, and then use
two string variables, together
with substr and find/rfind like we did in class
to split the input into noun and verb. Note that
the look verb comes in two forms: one with a noun
(meaning “look at this”, and one without (meaning “look at my
general surroundings”). This is why you have to use getline,
you can’t use the normal cin >>, because you don’t know
whether the input will consist of one word or two (and later stages
will add commands with three and more words).
Use a big if-else if-else chain to compare these
variables to all the commands and noun(s) your game understands,
and respond to them in the appropriate way. E.g., if you have a
variable verb which holds the first word, and another
variable noun which holds the second (or the empty
string, if there is no second word), you could do something
like:
if(verb == “look” and noun == “”) { // Print room description }
else if(verb == “look” and noun == “lamp”) { // Print lamp
description } … else { // All other (unknown) commands, print error
}
Use a bool variable to keep track of whether or not
the player is carrying the object. When the player GETs the
object, set it to true; when the player drops it, set it
to false. Use this variable in the above if-else
if-else conditions when you need to make something different
happen depending on whether or not the player is carrying the
object.
The quit command can just break from
the while(true) loop.
Thus, your main will end up looking something like this:
- The First Stage Of The Project Is To Recognize The Commands The User Enters And Split Them Up Into Their Relevant Words 3 (76.8 KiB) Viewed 35 times
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