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something something basicdoc update

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minjaesong
2020-12-26 02:07:30 +09:00
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assets/disk0/tbas/doc/langguide.tex
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@@ -14,7 +14,7 @@ Oh \emph{boy} we just did a computation! It printed out \code{4} which is a corr
\section[GOTO]{GOTO here and there}
\code{GOTO} is used a lot in BASIC, and so does in \tbas. \code{GOTO} is a simplest method of diverging a program flow: execute only the some part of the program conditionally and perform a loop.
\code{GOTO} is used a lot in BASIC, and so does in \tbas. \code{GOTO} is a simplest method of diverging a program flow: execute only the part of the program conditionally and perform a loop.
Following program attempts to calculate a square root of the input value, showing how \code{GOTO} can be used in such manner.
@@ -52,7 +52,7 @@ This program will draw a triangle, where the actual drawing part is on line 100-
\section[FOR--NEXT Loop]{FOR ever loop NEXT}
As we've just seen, you can make loops using \code{GOTO}s here and there, but they \emph{totally suck}, too much spaphetti crashes your cerebral cortex faster than \emph{Crash Bandicoot 2}. Fortunately, there's a better way to go about that: the FOR--NEXT loop!
As we've just seen, you can make loops using \code{GOTO}s here and there, but they \emph{totally suck}, too much spaghetti crashes your cerebral cortex faster than \emph{Crash Bandicoot 2}. Fortunately, there's a better way to go about that: the FOR--NEXT loop!
\begin{lstlisting}
10 GOTO 1000
@@ -97,7 +97,7 @@ Consider the following code:
90 NEXT
\end{lstlisting}
Here, we have defined two functions to use in the program: \code{POW2} and \code{DCOS2}. Also observe that functions are defined using variable \code{N}s, but we use them with \code{X} in line 40 and with \code{A} in line 80: yes, functions can have their local name so you don't have to carefully choose which variable name to use in your subroutine.
Here, we have defined two functions to use in the program: \code{POW2} and \code{DCOS}. Also observe that functions are defined using variable \code{N}s, but we use them with \code{X} in line 40 and with \code{A} in line 80: yes, functions can have their local name so you don't have to carefully choose which variable name to use in your subroutine.
Except a function can't have statements that spans 2- or more BASIC lines; but there are ways to get around that, including \code{DO} statement and \emph{functional currying}.
@@ -116,7 +116,7 @@ But don't get over-excited, as it's super-trivial to create unintentional infini
(if you tried this and computer becomes unresponsive, hit Ctrl-C to terminate the execution)
This failed attempt is to create a function that calculates a factorial of \code{N}. It didn't work because there is no \emph{halting condition}: didn't told computer to when to escape from the loop.
This failed attempt is to create a function that calculates a factorial of \code{N}. It didn't work because there is no \emph{halting condition}: didn't tell computer to when to escape from the loop.
$n \times 1$ is always $n$, and $0!$ is $1$, so it would be nice to break out of the loop when \code{N} reaches $0$; here is the modified program:
@@ -140,7 +140,7 @@ Since \code{IF-THEN-ELSE} can be chained to make third or more conditions --- \c
\code{MAP} is a \emph{higher-order}\footnote{Higher-order function is a function that takes another function as an argument.} function that takes a function (called \emph{transformation}) and an array to construct a new array that contains old array transformed with given \emph{transformation}.
Or, think about the old \code{FAC} program before: it only printed out the value of $1!$, $2!$ \ldots\ $10!$. What if we wanted to build an array that contains such values?
Or, think about the old \code{FAC} program before: it merely printed out the value of $1!$, $2!$ \ldots\ $10!$. What if we wanted to build an array that contains such values?
\begin{lstlisting}
10 DEFUN FAC(N)=IF N==0 THEN 1 ELSE N*FAC(N-1)
@@ -148,7 +148,7 @@ Or, think about the old \code{FAC} program before: it only printed out the value
30 PRINT K
\end{lstlisting}
Here, \code{K} will contain the values of $1!$, $2!$ \ldots\ $10!$. We're just printing out the array, but you can make acutual use out of the array.
Here, \code{K} will contain the values of $1!$, $2!$ \ldots\ $10!$. Right now we're just printing out the array, but you can make acutual use out of the array.
\section[Currying]{Haskell Curry Wants to Know Your Location}
\label{currying101}