Generalize the program below to allow negative integers

Assignment Help MATLAB Programming

Reference no: EM13166800

Using SML: Generalize the program below to allow negative integers on the input. We assume that negative integers are preceded by the minus sign(-) rather than the tilde (~). Note that we not only have to recognize negative integers but we can no longer use -1 as a convenient value to indicate that the end of file has been reached. Hint: Return an integer option that tells whether the end of file has been reached.

open TextIO;

val END = ~1;

fun digit(c) = c >= #"0" andalso c <= #"9";

fun startInt(file) = startInt1(file,input1(file))

and startInt1(file, NONE) = END

| startInt1(file, SOME c) =

if digit(c) then ord(c) - ord(#"0")

else startInt(file);

fun finishInt(i,file) =

if i = END then END

else finishInt1(i,file,input1(file))

and finishInt1(i, file, NONE) = i

| finishInt1(i, file, SOME c) =

if digit(c) then

finishInt(10*i+ord(c)-ord(#"0"), file)

else i;

fun getInt(file) = finishInt(startInt(file), file)

fun sumInts1(file) =

let

val i = getInt(file)

if i = END then 0

else i + sumInts1(file)

end;

fun sumInts(filename) = sumInts1(openIn(filename));

Reference no: EM13166800

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