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• by reference in C++

  - by lego69

  I have this snippet of the code Stack& Stack:: operator=(const Stack& stack){ if(this == &stack){ return *this } } here I define operator = but I can't understand, if I receive by reference stack why it should be & in this == &stack and not this == stack and why we return * in return *this and not this thanks in advance for any help

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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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• Is there a equivalent in C for C++ templates?

  - by nunos

  In the code I am writing I need a foo(int, char*) and a foo(int, int) functions. If I was coding this in C++ I would use templates. Is there any equivalent for C? Or should I use void pointers? How? Thanks.

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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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• 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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• Poblem with "CFDataRef".

  - by zp26

  Hello I have a problem with "CFDataRef. I get the "data" field from a "kCFSocketDataCallBack. "data" should correspond to a string received on the socket. How do I convert, for example, in a NSString so I can put my text in a textbox?? Thank you very much static void AcceptDataCallback(CFSocketRef s, CFSocketCallBackType type, CFDataRef address, const void *data, void *info) { //my code for the textBox }

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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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• 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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• fgets equilvilant in C++

  - by mitchell

  what is the C++ equivilant to the c function fgets? I have looked at getline from ifstream, but when it comes to a end of line character, '\n', it terminates at and discards it, I am looking for a function that just terminates at the end line character but adds the end of line character to the char array. thanks in advance

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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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• writing into a file in c.

  - by mekasperasky

  i have an char array b[20] which i want to write into a file . After every iteration the value of b[20] changes , so i would like to write the string in each line of the file in each iteration . So how can i change a new line in a file and also put in a array of character?

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• Using type passed as a template in C++

  - by MeDiCS

  Is it possible to actually use the type passed as a template for control flow? I'd like to write a function that uses templates, which in turn calls another function based on the type passed: template <class T> void test_function (T var) { //Do stuff if (T == char) { bar (var); } else { foo (var); } //Do even more stuff } If not, I'll have to fallback to enums...

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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 read a c-string and then an int with a single scanf in C?

  - by Aux

  Hey, I'm trying to get this function to get the following output with the listed input, the "..." is where I'm not sure what to write: void Question8(void) { char sentence[100]; int grade; scanf(….); printf("%s %d", sentence, grade); } Input: My CS Grade is 1000 Output: My CS Grade is 100 However, the kicker is that I need the scanf to read a c-string and then an int with a single scanf command, is this even possible?

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• Comparing the values of two nsstrings

  - by user1776234

  So I have been trying to compare two NSStrings in xcode. However, it is not working. What am I doing wrong? NSString Prog are characters that are xml parsed from mysql char *cStr = "YES"; NSString *str3 = [NSString stringWithUTF8String:cStr]; if ([str3 isEqualToString:prog]) { [switch1 setOn:YES animated:YES]; } else { [switch1 setOn:NO animated:YES]; }

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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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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• What issue is related with function that return a reference C++

  - by skydoor

  I only know that a function that return a non-const reference is a lvalue, you can assign a value to the function int& f() { return ***} f()=1; What else?

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