Strings, Strings and Damned Strings

[Ben]

I have an int variable (always <100) that I want to convert to a two character string, e.g.

if myint = 1, mystr = "01"
if myint = 81, mystr = "81"

At the moment I can't figure out how to do this cleanly.
Then I wish to push a bunch of these strings into an array, for example:

typedef char LABEL[3];
LABEL mystrArray[100];

But having read a couple of tutorials I am still no clearer on the best way to do an "array of strings" in this situation, nor
how to do it.

Any help much appreciated!

cheers,

Ben

[Walter Roberson]

In article <87************ @benpfaff.org>,
Ben Pfaff <bl*@cs.stanfor d.edu> wrote:

Ben <be*********@sp am.me> writes:

I have an int variable (always <100) that I want to convert to a two character string, e.g. if myint = 1, mystr = "01"

For a problem as simple as this, though, you can easily do it by
hand, if you like:
mystr[0] = myint / 10 + '0';
mystr[1] = myint % 10 + '0';

mystr[2] = 0;

double-quoted strings are null terminated...
--
I was very young in those days, but I was also rather dim.
-- Christopher Priest

[Dann Corbit]

"Ben" <be*********@sp am.me> wrote in message
news:12******** *****@corp.supe rnews.com...
[snip]

This compiles and runs ok but doesn't work as required since each update
to alabel, blabel etc changes those objects that all the pointers point
to, so I am not storing new labels just overwriting the same ones (the
print contents at 2) confirms that). Note I want the whole structure
labelArray to be available globally which is another problem with the code
above.

So I need to do something differently, perhaps the 2d array, but I
couldn't get that to compile. At least the values at 1) are correct, just
the structure is wrong.

What is the exact problem that you are trying to solve?

[Ben]

Dann Corbit wrote:

What is the exact problem that you are trying to solve?

Well, I've now worked around the problem (still without knowing how to build an array of strings). But it was part of a sudoku
solver. I was incorporating someone else's program for solving exact cover problems and had to remap some data.

[Andrew Poelstra]

On 2006-06-24, Ben <be*********@sp am.me> wrote:

Dann Corbit wrote:

What is the exact problem that you are trying to solve?

Well, I've now worked around the problem (still without knowing
how to build an array of strings). But it was part of a sudoku
solver. I was incorporating someone else's program for solving
exact cover problems and had to remap some data.

(Overly long lines corrected)

What exact problem involving the C language are you having, what
code are you having trouble with, what is it doing, and what
/should/ it be doing?

Since in C, strings are null-terminated arrays of char, an array
of strings could be implemented as an array of arrays of char.

char stringArr[5][10]; /* Allows 5 strings of max 9 length */

I'm not sure if the 5 and the 10 need to be switched for my
comment to be true.

--
Andrew Poelstra < http://www.wpsoftware.net/blog >
To email me, use "apoelstra" at the above address.
I know that area of town like the back of my head.

[Malcolm]

"Ben" <be*********@sp am.me> wrote

Dann Corbit wrote:

What is the exact problem that you are trying to solve?

Well, I've now worked around the problem (still without knowing how to
build an array of strings). But it was part of a sudoku solver. I was
incorporating someone else's program for solving exact cover problems >
and had to remap some data.

Not all character data has to be in ASCIIZ strings.

Sudoku, in case anyone doesn't know consists of a 9x9 grid, containing
digits 1-9. No digit can be repeated in any line, column, or 3x3 box.

The obvious way to represent the board in C is

char sudoku[9][9].

Now say we want to print out the board to the user. The obvious way to do
that is

for(i=0;i<9;i++ )
{
for(ii=0;ii<9;i i++)
putc(sudoku[i][i]]);
putc('\n');
}
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