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• How can I get the sizes of various types in c?

  - by user292489

  I'm looking for the following information to be printed out: sizeof(int) = ? sizeof(float) = ? sizeof(double) = ? sizeof(char) = ? sizeof (167) = ? sizeof(3.1415926) = ? sizeof(‘$’) = ?

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• C++, Searching and returning value.

  - by pure841

  For example, lets say I have this string: "Name, Name2, <b>Name3</b>, Name4, <b>Name5</b>" I am trying to get whatever value / name is inside the <b> tags. So when I search the char, I get the following in an array: Name3 Name5 Any ideas? Thanks

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• PHP: constant as variable in function

  - by m4recek

  I'm trying to use constant as a function paramter, is it possible to check type of this constant. Example of what I want: class ApiError { const INVALID_REQUEST = 200; } class Response { public function status(ApiError $status) { //function code here } } USE: $response = new Response(); $response->status(ApiError::INVALID_REQUEST); This shoud check that given $status is constant of class ApiError. Is something like this possible?

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• Retrieving the first digit of a number

  - by Michoel

  Hi, I am just learning Java and am trying to get my program to retrieve the first digit of a number - for example 543 should return 5, etc. I thought to convert to a string, but I am not sure how I can convert it back? Thanks for any help. int number = 534; String numberString = Integer.toString(number); char firstLetterChar = numberString.charAt(0); int firstDigit = ????

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• Phone number validation in PHP

  - by newbie

  I need to validate phone number in PHP. I have made following regex, but I also need to it to accept numbers starting with plus char, how can I do that? ^[0-9]$

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• Determine if a number is a prime with regex?

  - by kitlite

  I found the following code example for Java on RosettaCode: public static boolean prime(int n) { return !new String(new char[n]).matches(".?|(..+?)\\1+"); } I don't know Java in particular but understand all aspects of this snippet except for the regex itself I have basic to basic-advanced knowledge of Regex as you find it in the built-in PHP functions How does .?|(..+?)\\1+ match prime numbers?

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• How to list all the objects with a specific date no matter the time in a DateTime Field

  - by Marcoslhc

  I Have a model like this foo=models.char bar=models.dateime In wich several foos arrives in one day in different time. I need to list all the foos in a specific date, no matter the time they arrive. I can't change the model, so splitting the bar in two fields(one for date and one for time) is out of reach right now :(

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• Android 2.1 switch loop JRE 1.7

  - by Defuzer

  Hello how to use switch loop in my android project ? I want to use Android 2.1 I need JRE 1.7, but I want to use Android 2.1 I use loop like this: switch ((CHAR[Math.abs(intGen.nextInt()%2)])) { case "+": result = random2 + random3; break; case "-": result = random2 + random3; break; } LogCat: Cannot switch on a value of type String for source level below 1.7. Only convertible int values or enum variables are permitted

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• C++: Validate a pointer?

  - by Rosarch

  If I have a pointer, like char* foo, is there any way to determine if foo points to a valid location in memory? (So, foo is not NULL, and delete has not yet been called on it.)

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• Dynamic allocation in C

  - by Kerby82

  I'm writing a program and I have the following problem: char *tmp; sprintf (tmp,"%ld",(long)time_stamp_for_file_name); Could someone explain how much memory allocate for the string tmp. How many chars are a long variable? Thank you, I would appreciate also a link to an exahustive resource on this kind of information. Thank you

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• Is there a way to introspect an array's size?

  - by WilliamKF

  In C++ given an array like this: unsigned char bogus1[] = { 0x2e, 0x2e, 0x2e, 0x2e }; Is there a way to introspect bogus1 to find out is is four characters long?

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• How to assign class instances in exception handler during constructor execution

  - by xwoundwortx

  public Alphabet(params char[] list) { this.ExceptionInitializer(); try { if (list != null) _alphabet = list; else throw this.NullableAssignment; //add exception handler; this._charCounter = list.Length; } catch (this.NullableAssignment) { // var x = new Alphabet(); // this = x; //FAIL! } }

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• How to parse a string to an int in C++?

  - by eed3si9n

  What's the C++ way of parsing a string (given as char *) into an int? Robust and clear error handling is a plus (instead of returning zero).

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• Output of a C question..

  - by RBA

  int main() { int a=10,b=20; char x=1,y=0; if(a,b,x,y) { printf("EXAM"); } } Hi, Please let me know why output of this question is "Printed Nothing".. Thankss.

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• Best way to store a string in an iPhone app?

  - by pkulak

  I've started a new iPhone app that needs to remember a single, 40-char string. That's it. I've hooked into Core Data, and am reading about it now, but it really seems like overkill. Is there an easier way to do something so simple?

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• Question about Null vs zero

  - by Mike

  I have this function: void ToUpper(char * S) { while (*S!=0) { *S=(*S >= 'a' && *S <= 'z')?(*S-'a'+'A'):*S; S++; } } What does it mean for *S != 0, should it be null instead?

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• Looking for some help working with premultiplied alpha

  - by user315142

  I am trying to update a source image with the contents of multiple destination images. From what I can tell using premultiplied alpha is the way to go with this, but I think I am doing something wrong (function below). the image I am starting with is initialized with all ARGB values set to 0. When I run the function once the resulting image looks great, but when I start compositing on any others all the pixels that have alpha information get really messed up. Does anyone know if I am doing something glaringly wrong or if there is something extra I need to do to modify the color values? void CompositeImage(unsigned char *src, unsigned char *dest, int srcW, int srcH){ int w = srcW; int h = srcH; int px0; int px1; int px2; int px3; int inverseAlpha; int r; int g; int b; int a; int y; int x; for (y = 0; y < h; y++) { for (x= 0; x< w*4; x+=4) { // pixel number px0 = (y*w*4) + x; px1 = (y*w*4) + (x+1); px2 = (y*w*4) + (x+2); px3 = (y*w*4) + (x+3); inverseAlpha = 1 - src[px3]; // create new values r = src[px0] + inverseAlpha * dest[px0]; g = src[px1] + inverseAlpha * dest[px1]; b = src[px2] + inverseAlpha * dest[px2]; a = src[px3] + inverseAlpha * dest[px3]; // update destination image dest[px0] = r; dest[px1] = g; dest[px2] = b; dest[px3] = a; } } }

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• TSQL - MSSQL 2008 add a column and update it in same stored procedure

  - by TortTupper

  if I have a stored procedure say create procure w AS ALTER TABLE t ADD x char(1) UPDATE t set x =1 Even when it lets me create that stored procedure (if I create it when x exists), when it runs, there is an error on the UPDATE statement because column x doesn't exist. What's the conventional way to deal with this, it must come up all the time? I can work around it by putting the UPDATE inside EXEC, is there another/better way? Thanks

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• Is objective C 2.0 a proper superset of C?

  - by RankWeis

  I've heard that objective-C is a proper superset of C, but is objective-C 2.0? The reason I ask is that either it isn't, or I misunderstand the phrase 'proper superset', because this code is valid C syntax: import int main () { char *nil = "hello"; printf("%s\n",nil); } But does not compile in Objective-C 2.0. Obviously, this is an easily fixable problem, but I'm writing a paper, and feel that this is something that should be pointed out.

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• p=malloc()!=null.......

  - by gcc

  char *p,*p1,*p2,*p3,*p4; for(;;) { if((p=malloc(10))!=NULL && (p1=malloc(20))!=NULL ......) break; } Writing if(........) is too boring and long, are there any ways to make it simpler?

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• How to find whether an element exists in std::map?

  - by Vincenzo

  My use case: map<string, Car> cars; bool exists(const string& name) { // somehow I should find whether my MAP has a car // with the name provided return false; } Could you please suggest the best and the most elegant way to do it in C++? Thanks.

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• Should this C pointer be released?

  - by rmcc

  Please excuse my C newbiness. Consider the following C procedure: int doSomething() { char *numbers="123456"; ... } Before this procedure exits should I be releasing the 'numbers' pointer?

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• Weird initialization in C

  - by pacopepe

  Hi there, I have this piece of code and i don't know how it works #include <stdio.h> int main(void) { int numero = ({const int i = 10; i+10;}); printf("%d\n", numero); // Prints 20 return 0; } Why if i delete the second part (i+10;), the compiler gets an error? Why are the brackets necessary? Thank you ^^!

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• How do you detect if a list has exactly 3 items in Haskell?

  - by kunjaan

  I have this but I got an error: -- test if a list containts exactly three characters test :: [Char] -> Bool test xs | [_ , _ , _] = True | otherwise = False

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• convert &uuml; to u

  - by Remus Rigo

  hi all I'm using a database that contains contacts (fields like name, address, ...). If i'm using in my database a city that contains special chars (like ü) or html codes (like &uuml;), then how can i convert them to u, so when i search for a city that contains that a special char should be shown in the result...

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