Programming :: If Test Validation - Using Char Arrays

Jun 9, 2010

I'm writing a code to get the index of the last occurrence of a given substring in a string.

int StringHandler::lastIndexOf(string src, const string s) {
unsigned int lastIndex = string::npos;
if (src.find(s, 0) == string::npos) {
return -1; } else {
bool isLast = false; unsigned int i = 0; do {
lastIndex = src.find(s, i);
if (lastIndex != string::npos) { i = lastIndex + 1;
if (i == src.size()) { isLast = true;
} } else { isLast = true;
} } while (!isLast);
} return lastIndex;

My problem is: execution steps into an if with a false condition! Check the values of i and src.size() at the right panel. How could be possible for the program to run the highlighted statement? The if condition above is false! [URL]. I could use char arrays, for example, but this kind of false validation has happened to me more than once, I'm using G++ 4.5 with these flags: -O0 -g -Wall -c

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Programming :: Fixing C++ Invalid Conversion From Const Char* To Char?

Mar 4, 2010

m getting the following error when trying to compile:Quote:

$ make
g++ -march=athlon64 -O2 -pipe -fomit-frame-pointer -msse3 -c -D_GNU_SOURCE -DPLUGIN_NAME_I18N='"undelete"' -DHAVE_SVDRP -I../../../include undelete.c


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Programming :: Point A Char Pointer To A Part Of Another Char Array?

Nov 4, 2010

Programming in C.I have two char arrays.char buf1[1024];char buf2[1024];Aren't buf1 and buf2 also pointers?I read in 1024 bytes into buf1 which contain about 300 bytes of characters with newlines. The data is basically a few English sentences. I'm trying to scan buf1 for newlines and then stop at the 1st newline and copy the rest of the data from that 1st newline into buf2.So I run a for loop to look for that new line.

for(i=0; i<1024;i++) {
if((strcmp(&buf1[i], "


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Programming :: C++ Invalid Conversion From Const Char* To Char*

Jul 9, 2010

I am having trouble with the following exception class.


/**Standard Exception


Line 43 points at the snprintf() command.I think the error has to do with the function being virtual and the const after the function definition, however although I have been looking really hard I have not being able to find the reason nor the solution to the problem.

One workaround that I know is moving the block of source withing the virtual function, in the constructor, however having read around (boost library exceptions tutorials) it specifically said that formating of errors messages should not take place withing the construction of objects because we are risking throwing an exceptions and messing up the flow order.

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Programming :: Char Variable Is Behaving As Unsigned Char?

Feb 14, 2011

i define variable of type char (range -128 to 127). when i tried to print the value after assigning a -ve value to it it displaying a +ve value of that -ve value(256+value).

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Programming :: SH: Remove Last Char If It Is An Empty Char In A String

Jul 5, 2011

With this I may remove the last emtpy char which is not visible, coming from net, windows, ...

echo "$mystringwindowsorotherwithemptylastchar" |sed s/.$//

However if there are not then it makes a problem and delete effectively an existing char.

echo "klklj" |sed s/.$//

Anyone would have a solution for SH?

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Programming :: Convert A Char * To Unsigned Char?

Mar 4, 2010

is it possible to convert a variable from char * to unsigned char ?

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Programming :: Form Field Validation Using PHP

Sep 10, 2009

I want to validate a web form using PHP. I spent ages confusing myself with client side scripting and realised until I worked out it is not what I want. My problem is that now I am looking at PHP and everything is mixed up in my brain. I need to point out that PHP is very new to me! This is what I already have:
1 An html page with my form on it.
2 PHP page which emails the contents of the form to me.

The above works well. For the sake of clarity, here are my pages (cut down to the essentials where appropriate): My html form:
first name surname
Home phone
Work phone

I have read and understood your terms and conditions. My php script (regform.php)
$receiver = 'me@email'; $subject = 'New registration'; #$message = 'This is a new registration.'; $surname = $_POST['surname']; $firstname = $_POST['firstname']; $address = $_POST['address']; $email = $_POST['email']; $homeph = $_POST['homeph']; $mobileph = $_POST['mobileph']; $workph = $_POST['workph']; $time = $_POST['time']; #from here $oldaddress = $_POST['oldaddress']; $DOB = $_POST['DOB']; $elect = $_POST['elect']; $job = $_POST['job']; $salary = $_POST['salary']; $employer = $_POST['employer']; $benefit = $_POST['benefit']; $smoke = $_POST['smoke']; $claim = $_POST['claim']; $children = $_POST['children']; $children2 = $_POST['children2']; $pets = $_POST['pets']; $pets2 = $_POST['pets2']; $require = $_POST['require']; $terms = $_POST['terms']; $rooms = $_POST['rooms']; $body = "first name:$firstname
home phone:$homeph
mobile phone:$mobileph
work phone:$workph
time at this address:$time
previous address:$oldaddress
electoral register:$elect
benefit claim:$benefit
future benefit:$claim
pet type:$pets2
other requirements:$require
terms:$terms"; $headers = 'From: email' . "
" . 'Reply-To: email "
" . 'X-Mailer: PHP/' . phpversion(); mail($receiver, $subject, $body, $headers, "From: $firstname $surname
" . "Reply-To: $firstname $surname class="inlineimg" />;

You can see there are many more form fields than I have shown in my example html form above. What I want is that the following fields have to be filled:
1 mobileph
2 email
3 terms (checkbox)
I would like the user to be asked to fill the form in properly if any/all of the 3 fields have not been filled in. I imagine I need some php in the html page and some more in the php page. I am certainly not asking any one to do this for me but I am really confused. I have googled and copied and pasted and edited for 6 hours and I am lost. What I want is a very simple and clear example of the code needed. Sorry if I sound as if I can't search properly on Google: in this case I clearly can't!

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Programming :: Programing - Reading File Line By Line Then Char By Char In Each Line

May 29, 2010

I've never programed shell scripting.

Code goes like so:

I simply want to read a file "data.txt" line by line Then char by char and add them into a result var. The file is supossed to always contain numeric values

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Programming :: Perl Script - Phone Number Validation

Apr 1, 2010

I am doing a perl script validation for Phone numbers. The normal phone number format is 01-32145. I need to do two validations for the phone number

1) A valid phone number can have at least two digits as prefix and at least five digits as postfix. e.g. 01-01011
2) A valid phnoe number can't contain only the digit "0" in either area code or phone number e.g. 00-11111 or 01-00000 is not allowed.

I am able to do the first validation, but not the second. I am pasting my code part here. How to add the second validation inside my current code.

open(TMPOUTPUT, "<$tmp_output_file") or die "Can't open output";
open(OUTPUT, ">$output_file") or die "Can't open output";
while ($line = <TMPOUTPUT>) { $line =~ s/ +
//; ($cur_phone, $xxxxxx, $xxxxxx) = split(";", $line);
($cur_phone_prefix, $cur_phone_postfix) = split("-", $cur_phone);
$length_prefix = length ($cur_phone_prefix);
$length_postfix = length ($cur_phone_postfix);
if ($length_prefix < 2 || $length_postfix < 5 ) {
print "Invalid phone number: $cur_phone ";
} else { print "Valid phone number: $cur_phone ";
} } close TMPOUTPUT; close OUTPUT;

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Programming :: Data Validation - Input Contains Digits And Certain Alphabets

Apr 8, 2010

I am having a huge problem checking the data I input to make sure it is correct. What I am trying to achieve is when I input a value, it will check if the input is all digits and if it is not, check to see if it contains certain alphabets. Thus for example, if I were to input in data such as "11A" , the program will then inform me "There is an important alphabet in the program." This would be my expected output. Here is the program I have wrote...

int test(string r ){ const int arraySize = 10;
char array2[arraySize2] ={'A','B','E','F','G','H','J','K','N','O','P','Q','R','S','T','U','W','Y','Z'};
for(int cntr = 0; cntr <r.length(); cntr++)
if(!isdigit(r[cntr])){ for(int new1 =0; new1<arraySize2;new1++)
for(int cntr1 = 0; cntr1 <r.length(); cntr1++)
if(array2[new1] == r[cntr1]){ return 2; //will return2 when it finds the same
// char in the array and the string r. } else{ return 3;
//will return 3 when there is a char
//in the string which isnt in the array
} } else { return 1; // will return 1 when string is all digit.
} int main() { string r = "11D"; test(r);
if(test(r) == 1) { cout << "ALL ARE DIGITS" << endl;
} if (test(r)== 2) {
cout << "There is an important alphabet in the program." << endl;
} if (test(r)== 3) { // testRoman(r);
cout << "There is an Alphabet in the String which is not in the Array" << endl;
} }

So, the problem I am facing is when I input in data such as 11 or A , the prog will come out the right input. But if I were to put in data such as "11A" , the output coming out will be "ALL ARE DIGITS". The problem which causes this seems to be in the return statement , as once as it finds the first char which is a digit, it will then return 1 and not continue checking the rest of the string. Is there a way I can stop or continue a loop if it has met the condition I stated? What I can do or any other way available for me to check my input?

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Programming :: Arrays In The C Programming Language Are Pointers To The First Element Of The Array?

Mar 27, 2010

I wonder why arrays in the C programming language are pointers to the first element of the array, not the first element of the array itself?

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Programming :: Adding Two Arrays?

Mar 1, 2010

I have a problem on a program,the problem take a very long time when i try to add two big arrays element by elementI know that matlab make adding vectors more faster than adding element by element but I don't know how!!!do any body knew how matlab make vectors operations more faster than element by element???I want to make my calculation more faster because the program is very big

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Programming :: Character Arrays In C?

Nov 3, 2010

I was reading Kernighan Ritchie book chapter 4 which deals with character pointers.I am not able to understand following different type of declarations

char aname[][15] = { "Illegal month", "Jan", "Feb", "Mar" };
char amessage[] = "now is the time";


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Programming :: Using Of Arrays In Loops?

Sep 3, 2009

need to process files within multiple directories and transfer these to a remote server. What I had in mind was to use arrays for this; code pasted below (explains it better):

#set the arrays
array_A=( fileA* pathtodestA hostA passwordA )


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Programming :: Can Diff Take Arrays As Input

Jun 19, 2010

Does diff not like arrays? How do achieve the following?


stuart@stuart:~/music transfer$ diff file1.txt file2.txt
< bonkers_in_phoenix.mp3


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Programming :: Initializing Arrays In The Bash?

Mar 12, 2009

I'm making script for automated compiling of one program which would output builds optimized for many architectures. For clearancy, I do each build in it's own catalogue and list of builds with their respective catalogues would be stored as array. I'm using this guide as reference. It describes making array as naming a variable with additional brackets denoting it's position in array.

In my code, it looks exactly like this:




But upon invoking $mtune or any $mtune[x] variable, output is blank, like the variable(s) were never initialized. What am I doing wrong?

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Programming :: Printing 2 Arrays To 2 Columns?

Jun 16, 2010

I have a Perl script that has two arrays - they are related. I would like to print out the contents into two columns next to each other.

open(PINGFILE, </home/casper/pingdata.txt") or die " can not open file ";
my @totalfile=<PINGFILE>;
foreach $string(@totalfile) {
if ($string =~ m/(^1sping)(?=.*max))/) {


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Programming :: Structures And String Arrays, C?

Apr 18, 2011

I am working on a project that needs to use structures and I'm pretty sure string arrays. First I declare my structures and they must be exactly like this.

typedef struct
int hour;


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Programming :: Create A Small Array Of 3x3 Arrays?

Jul 12, 2009

I'm trying to figure how to create an small array of 3x3 arrays such I can do


SUM1(i) = SUM1(i) + SUM2

where i goes from 1 to 8 and SUM2 is a 3x3 array.

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Programming :: Read Text File Using Arrays In C++?

Oct 19, 2010

a project using bluetooth to send data byte by byte to external devices buti'm not familiar using arrays to read file from another location before sending the data.If you could,do correct my codes.Here's my code,

void loop(){
char Msg[]={"Hello"};
char *start;


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Programming :: Get Number Of Elements In A Hash Of Arrays?

Dec 10, 2008

I have something like this:

$arr_hash{'produce'}{'veggies'}[0] = Broccoli
$arr_hash{'produce'}{'veggies'}[1] = Cauliflower
$arr_hash{'produce'}{'veggies'}[2] = Carrots


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Programming :: Perl - Pointers To Arrays From Hashes?

Feb 18, 2010

I'm trying to figure out how to code for this specific type of instance - I want to use a hash and have the key be a reference to an array, and not use the key in the standard way of it being a scalar. Basically, I have a large output that I need to process line by line, and rather have access to it as an array than a big block in a scalar. For the big block hash as a scalar I would do -

$ALL_DISKS{$CONTROLLER} = `ssh -n <commands>`;

Now I know I could take the scalar and split it to another array after the fact like -


How would I code it that I would have access to the key information as an array and not a scalar? I know it needs to be a pointer and we're going to have -> in there somewhere, but not sure how to approach it. Some of the documentaiton I've been reading about referencing I've found a little confusing so far, and trying to figure out how to use them in context of what I'm working on.

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Programming :: Cannot Get Ncurses To Delete Char With

Jan 6, 2010

I've modified a program to show * instead of letters when typing a password. I'm trying to make it so that when pressing backspace a * will be removed.Here's a rough example. The problem is that when trying to do this in the real program,' is not recognized as backspace.

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Programming :: GMP And Converting Mpz_t To Char?

Jul 16, 2011

I'm writing the Diffie-Hellman key exchange system using GMP to handle big integers. For the most part, everything works. I can convert the string to mpz_t, set up the keys and everything, and encrypt it fine. Its the decrypting I'm having issues with. What I'm using is mpz_xor() for both. To encrypt I'm doing mpz_xor(buffer, mpz_of_text, secret_key), and to decrypt I'm doing mpz_xor(buffer, mpz_of_cipher, secret_key).

For one character, it'll decrypt it fine, but it'll return it as it's ASCII value (i.e.: if I encrypt "A", it'll decrypt it as 65). Which, I can easily just do sprintf(decrypted_buffer, "%c", 65) for example and be fine. But, when I'm sending text bigger than one character, the encryption for AB gives me something like 1061043 after running the decrypting xor on it.

Has anyone ever done this before or can point me in some directions? Perhaps other algorithms to try? I know XOR isn't the most secure encryption method to use, but at the time I wasn't sure what else to use. I'm really just having a hard time trying to convert a mpz_t to a character string. I've looked at mpz_get_str() and it works before running encryption (i.e.: using mpz_set_str() to create a mpz of a string, then calling mpz_get_str() to change it back). Maybe my XOR method is wrong? Here's the code I'm using:


* str2mpz()
* b The current buffer of text to convert [in]
* m The mpz_t variable to store converted text [out]


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Programming :: Get The Number Of Elements In A Char*[] In C++?

Jan 27, 2011

I have a char*[] array:

char* myarray[] = {"Hello", "there!", "LQ"};

and I wish to use/ write a function to find the number of elements in myarray (in this case, its 3).

*equivalent of .NET's array.size() that returns number of elements in array

How do I achieve it?

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Programming :: Passing A Char* By Reference In C++?

Apr 26, 2010

Below I've presented the declaration, definition and the calling method of a function w.r.t pass by reference:



void getUnpackedMsg (unsigned char &data, unsigned int numberOfBits);
line 278: Shown in RED


void packedMessage :: getUnpackedMsg (unsigned char &emptyArray, unsigned int numberOfBits)
printf ("


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Programming :: Vi - Deleting Up To First Nonblank Char?

Jul 18, 2010

What could be a command to erase from the cursor up to the first non-blank char in vi (or vim)?

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Programming :: PHP - Sorting Multi Dimensional Arrays By One Column

Mar 17, 2009

I just started programming in PHP so I haven't figured out how to do this yet, but I have a multi-dimensional array that I need to sort by one column. That's fine...but I need the sort to ignore case! Right now I have it sorted by 'name' (the other column is 'uid').

The problem is that by the default the sort is case-sensitive so the array looks like this:
Apple 4015
Banana 4011
Cherry 4045
avocado 4046

I want to be able to sort the the 'name' column in a case-insensitive manner so that the array actually looks like:
Apple 4015
avocado 4046
Banana 4011
Cherry 4045

How to accomplish this? Just FYI I'm not actually sorting the PLUs for fruits...but it was a simple example. I'm actually doing this for a Facebook application.

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Programming :: Bash: Combine Arrays & Delete Duplicates?

May 23, 2011

I would like to combine two arrays and delete duplicates that might occur. I tried to solve it like this:

combined=( "${results1[@]}" "${results2[@]}" )
printf "${combined[@]}" | sort -n | uniq
result1 (4 elements):


In my code printf seems to have a problem with elements that have the same letters but a space inbetween. For instance "new foo", "newfoo" are the same for printf

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