Reading in white space

Posted on 2003-02-19
Medium Priority
Last Modified: 2010-04-01
I am having a problem reading in white space when taking characters off of a string...any suggestions?

This is what I have so far...

symbol = array[ptr2][ptr];
while ( symbol == ' ' )

bla bla bla

Thanks for looking...
Question by:ArthurFonzareli
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Expert Comment

ID: 7985538
what do you mean by whitespace?  cause, '' is probably not that; but ' ' is ( i.e. there must be an actual space there )  also, the question is not very clear and the code you wrote is, ummm, incorrect.  can you post more details and some actual, compiling code?
LVL 12

Accepted Solution

Salte earned 400 total points
ID: 7986599
For one thing, C++ nor C nor any other language in the C family of languages have any construct like:

while (1) {
} while (test);

do { ... } while (test);


while (test) { ... }

are the two constructs that are in use.

Secondly '' is not a valid token, it is possible you write ' ' or meant to write ' ' but that is only testing for space. What about tab characters? They also count as space in most cases.

If you want to skip whitespace C++ has a mechanism for doing so:

ifstream file("file.txt");
file >> ws >> ... ;

The 'ws' there will tell file to skip any whitespace before next read. Most formatted reads will skip whitespace anyway but ws will also do it in the few cases where it otherwise wouldn't.

Unformatted read never skip whitespace but doing ws(file) or file >> ws; will then cause it to skip whitespace also if you do an unformatted read after.

Good luck with your program.


Author Comment

ID: 7988625

You knew exactly what I meant...

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