Reading strings

[Horizon]

Hello,

I'm trying to stop a program when a space is encountered in a string, I've used the example code below to show my train of thought. Why would the last string not be just 'the' stopping at the space?


print" 'Jumped over' one character at a time."
print
b$="Jumped over"
for i = 1 to len(b$)
print left$(b$, i)
next i

c$="the lazy fox"
for k= 1 to len(c$)
d$= left$(c$, k)
if d$ = chr$(32) then [stopHere]
next k

print
[stopHere]
print d$
print "Should be just 'the'?"
'Why does this print the whole phrase in c$ not just 'the'

There is the same result if d$ is set as a ' ' (space) value. Any insight would be great.

[tsh73]

You likely need not whole left part of the string
but just single letter
b$="Jumped over"
print left$(b$,4)
'Jump
print mid$(b$,4, 1)
'p


Also
for k= 1 to len(c$)
d$= left$(c$, i)
you have loop by 'k' but use inside loop 'i'

It could be made working by checking not whole d$ against space but single rightmost character

c$="the lazy fox"
for k= 1 to len(c$)
d$= left$(c$, k)
'if d$ = chr$(32) then [stopHere]
if right$(d$, 1) = chr$(32) then [stopHere] 'check single rightmost character
next k

print
[stopHere]
print d$



[tsh73]

Second and third thoughts.
2)I would use MID$ just to spill it letter by letter
c$="the lazy fox"
for k= 1 to len(c$)
   d$= mid$(c$, k, 1)  'single letter
   print d$;
   if d$ = chr$(32) then exit for
next k


3) current version of JB/LB SERIOUSLY DOESN'T LIKE jumping out of loop this way
What harm could ensue? Well, program will mysteriously misbehave and you never get why.
(Why? something with keeping order of returns to loop start. Happened with nested loops, FOR loops, WHILE loops, DO loops - any combination)
for k= 1 to len(c$)
 '...
 if d$ = chr$(32) then [stopHere]  'don't do that
 '...
next k
There is dedicated EXIT FOR operator, use it
for k= 1 to len(c$)
 '...
 if d$ = chr$(32) then exit for  'save exit
 '...
next k


4) If you didn't get versed with WORD$() function give it a go.
Because it is made just for splitting words
and getting first word is as simple as
print word$(c$, 1)

[Horizon]

Thanks Tsh73,

I spotted my typo ('i instead of k') after your post. I see how checking the next right most character for a single space disregards the rest of the string.

I really appreciate the help. Word$ looks very interesting too.

Horizon

[jarych]

Another possible way is to use INSTR(). I will try to check on this to find how.

LATER ADDING SAMPLE:

Here is something you may use.

[rerun]

print "Give us a string with OR without spaces."

input giveus$

if giveus$="" then end

PRINT

REM look for any leftmost single space within the inputted string.

anyspace=instr(giveus$," ")

if anyspace=0 then

print "program can now continue to rerun because no space was found  in your string."

goto [rerun]

end if



REM block in case a single space was found

print "a space was found at position "; anyspace ;" in the string you gave us."

print "This brings program to an END."



END