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• c++ memcpy return value

  - by knittl

  according to http://www.cplusplus.com/reference/clibrary/cstring/memcpy/ c++'s memcpy takes three parameters: destination, source and size/bytes. it also returns a pointer. why is that so? aren't the parameters enough to input and copy data. or am i misunderstanding something? the examples don't use the return value

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• Access element of pointed std::vector

  - by user146780

  I have a function where I provide a pointer to a std::vector. I want to make x = to vector[element] but i'm getting compiler errors. I'm doing: void Function(std::vector<int> *input) { int a; a = *input[0]; } What is the right way to do this? Thanks

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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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• delete vs NULL in c++

  - by hero

  what is the difference between deleting a pointer and setting it to null. delete ptr; ptr=NULL;

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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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• 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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• Remove button box

  - by stdio

  I'm writing an application in C and I've a GtkLinkButton that contains a GtkStockItem. How can I remove the button box that appears when mouse pointer is on and when I click it?

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• Problem with C++ classes

  - by Mike

  I have a class defined called extBlock. I then make an instance of that class with this extBlock mainBlock = new extBlock(1, 1024); I get this error: error C2440: 'initializing' : cannot convert from 'extBlock *' to 'extBlock' Can anyone help me with why I am getting this error. I have seen examples online of declaring it like this with a pointer extBlock *mainBlock = new extBlock(1, 1024); But if I do it this way it does not let me call the functions of mainBlock

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• Create folder for todays date

  - by Ram

  Hi, I have a folder named as 2010. In this I want a folder for each month like "Jan10", "Feb10"....."Dec10" In each month folder I want to create folder for "Todays date" I have create a shortcut for that 2010 folder with Target as C:\WINDOWS\explorer.exe /n, /e, /select, F:\2010 I want a functionality that will execute when I click the shortcut for f:\2010 icon. Any pointer would be great help.

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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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• 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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• 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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• Interpreter more strict

  - by pacopepe

  Hi, Today, i lost a lot of time fixing a stupid error in my code. Very simplified, the problem was this: def f(): return 2 2 == f I forgot to write the parenthesis in the sentence, so I compared a pointer function with a number. Ok, my question: Is there any way to change the interpreter to be more stricted with the code? Show more warnings for example... Thanks ^^

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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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• 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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• 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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• 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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• 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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• exceptions in C++

  - by helloWorld

  I have some techniacal question, in this function: string report() const { if(list.begin() == list.end()){ throw "not good"; } //do something } if I throw exception what is going on with the program? Will my function terminate or it will run further? if it terminates, what value will it return?

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• How to get only first words from several C++ strings?

  - by Knodel

  I have several C++ strings with some words. I need to get first word from every string. Then I have to put all of them into a char array. How can I do it? Thanks i advance!

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• how to erase the file contents of text file in python and c++?

  - by mekasperasky

  i have text file which has certain values which i want to erase in C++ and python . How to do it?Do i have to assign the file pointer to a null value string?

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• [gtk+] error: undeclared function

  - by sterh

  Hello, In my gtk+ application i have function in mainwin.c: void on_prev( GtkWidget* btn, MainWin* mw ) { ... } And in file ui.h i have: #include "mainwin.h" static const GtkActionEntry entries[] = { { "Go Back", GTK_STOCK_GO_BACK, "Go Back", "<control>b", "Go Back", G_CALLBACK(on_prev) }, } But when i try to compile this application, i see error: ui.h:error: 'on_prev' undeclared here (not in a function). What's wrong? Thank you.

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• make it simpliest

  - by gcc

  input 000 000 000 000 255 000 000 000 000 000 000 000 purpose instead of 000 write 0 and 255 write 2 take input { char A[800][600]; scanf("%d",&height); for(i=0;i<height;++i) scanf("%s",A[i]); then what output 0 0 0 0 2 0 0 0 0 0 0 0

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• linux kernel idle tick eater (or what will be current task_struct when CPU is 0%)

  - by osgx

  Hello What process will be pointed by "current" pointer in linux kernel, when CPU load is 0% and there is no any ready-to-run process? Consider situation without any power-saving. What is the name of this porcess? I think task with pid 0 will be running and code will be rep nop or HLT

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