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• sed as grep + ignore # and match

  - by yael

  I have the following file example more somefile param=a b c d e f g z x w # param=a b c d e f g z x w I need to create with sed the following (should be one line if possible): Ignore # char in the beginning of line Match first the param string Second match the "a b c d e f g z x w" (like grep -w) and give exit status if success Something like .... sed "/^ *#/b; /\<param\>/" ....

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• Is this a correct syntax (c code found on wikipedia)?

  - by m4design

  I just found this code on wikipedia. Link: http://en.wikipedia.org/wiki/Sizeof#Use The code: /* the following code illustrates the use of sizeof * with variables and expressions (no parentheses needed), * and with type names (parentheses needed) */ char c; printf("%zu,%zu", sizeof c, sizeof(int)); It states that: "The z prefix should be used to print it, because the actual size can differ on each architecture." I tried it on my compiler, but it gives the following result: 'zu,zu'

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• How NOT to skip BOM info (FF FE) when using fread or ifstream?

  - by al_lea

  I'm trying to use fread/ifstream to read the first 2 bytes of a .csv with BOM info. But following code always skips the first two bytes (which are 'FF FE'): ifstream is; is.open (fn, ios::binary ); char buf[2]; is.read(buf, 2); is.close(); using FILE*/fread does no better.

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• Can RAM handle different data type sizes?

  - by tstbu

  int, char and bool usually have different sizes. Where intcharbool, I suppose. But does the RAM even support this? How is it built up? Can it take advantage of bool being only 1 byte and store it in a small "register"?

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• Detect if class has overloaded function fails on Comeau compiler

  - by Frank

  Hi Everyone, I'm trying to use SFINAE to detect if a class has an overloaded member function that takes a certain type. The code I have seems to work correctly in Visual Studio and GCC, but does not compile using the Comeau online compiler. Here is the code I'm using: #include <stdio.h> //Comeau doesnt' have boost, so define our own enable_if_c template<bool value> struct enable_if_c { typedef void type; }; template<> struct enable_if_c< false > {}; //Class that has the overloaded member function class TestClass { public: void Func(float value) { printf( "%f\n", value ); } void Func(int value) { printf( "%i\n", value ); } }; //Struct to detect if TestClass has an overloaded member function for type T template<typename T> struct HasFunc { template<typename U, void (TestClass::*)( U )> struct SFINAE {}; template<typename U> static char Test(SFINAE<U, &TestClass::Func>*); template<typename U> static int Test(...); static const bool Has = sizeof(Test<T>(0)) == sizeof(char); }; //Use enable_if_c to only allow the function call if TestClass has a valid overload for T template<typename T> typename enable_if_c<HasFunc<T>::Has>::type CallFunc(TestClass &test, T value) { test.Func( value ); } int main() { float value1 = 0.0f; int value2 = 0; TestClass testClass; CallFunc( testClass, value1 ); //Should call TestClass::Func( float ) CallFunc( testClass, value2 ); //Should call TestClass::Func( int ) } The error message is: no instance of function template "CallFunc" matches the argument list. It seems that HasFunc::Has is false for int and float when it should be true. Is this a bug in the Comeau compiler? Am I doing something that's not standard? And if so, what do I need to do to fix it?

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• What's wrong with my using argc/argv this way in c?

  - by user198729

  This works: int main( int argc, char *argv[]) { .... gtk_init(&argc, &argv); .... But this doesn't: int WINAPI WinMain (HINSTANCE p1, HINSTANCE p2, LPSTR argv, int argc) { .... gtk_init(&argc, &argv); .... Can someone point out what's wrong there?

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• Why should we typedef a struct so often in C?

  - by Manoj Doubts

  I have seen many programs consisting of structures like the one below typedef struct { int i; char k; } elem; elem user; I have seen this many times. Why is it needed so often? Any specific reason or applicable area?

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• How to interpret binary data as an integer?

  - by StackedCrooked

  The codebase at work contains some code that looks roughly like this: #define DATA_LENGTH 64 u_int32 SmartKey::SerialNumber() { unsigned char data[DATA_LENGTH]; // ... initialized data buffer return *(u_int32*)data; } This code works correctly, but GCC gives the following warning: warning: dereferencing pointer ‘serialNumber’ does break strict-aliasing rules Can someone explain this warning? Is this code potentially dangerous? How can it be improved?

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• C++: Chr() and unichr() equivalent?

  - by alex

  I could have sworn I used a chr() function 40 minutes ago but can't find the file. I know it can go up to 256 so I use this: std::string chars = ""; chars += (char) 42; //etc So that's alright, but I really want to access unicode characters. Can I do (w_char) 512? Or maybe something just like the unichr() function in python, I just can't find a way to access any of those characters.

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• Better alternative for PipedReader/PipedWriter?

  - by Esko Luontola

  I need to have a buffered char stream, into which I write in one thread and from which I read in another thread. Right now I'm using PipedReader and PipedWriter for it, but those classes cause a performance problem: PipedReader does a wait(1000) when its internal buffer is empty, which causes my application to lag visibly. Would there be some library which does the same thing as PipedReader/PipedWriter, but with better performance? Or will I have to implement my own wheels?

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• Inserting data into a Database

  - by Erebus

  SO I'm making a "basic" login file where a person logs in and the data that person entered on that form gets transfered to another form aka my database/table. I think the problems is here but I'll post the rest of the code. CREATE FUNCTION dbo.Function4 ( parameter1 int = 5, parameter2 datatype ) RETURNS Table1 TABLE (UserName, Password, Password_Confirmation, Assets) AS BEGIN INSERT INTO Table1 (UserName, Password, Password_Confirmation, Assets) VALUES (a,b,c,d); /*SELECT ... FROM ...*/ RETURN END This is the Login Form using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms; namespace Login_Basic { public partial class Form2 : Form { public Form2() { InitializeComponent(); } Form3 Delta = new Form3(); private void label3_Click(object sender, EventArgs e) { } private void Form2_Load(object sender, EventArgs e) { this.Hide(); } private void textBox6_TextChanged(object sender, EventArgs e) { } private void textBox6_KeyPress(object sender, KeyPressEventArgs e) { int i = Convert.ToInt32(e.KeyChar); if (!(Char.IsDigit(e.KeyChar) || Char.IsControl(e.KeyChar) || (e.KeyChar == '.' && this.Text.Contains(".") == false))) e.Handled = true; } private void button1_Click(object sender, EventArgs e) { Delta.Show(); //if (textBox3.Text.Equals("")) //{ // MessageBox.Show("Please enter your username"); //} //else //{ // this.Hide(); //} // if (textBox4.Text.Equals("")) //{ // MessageBox.Show("Please enter your password"); // } // else //{ // this.Hide(); // } // if (textBox5.Text.Equals("")) // { // MessageBox.Show("Please re-enter your password"); // } // else // { // this.Hide(); // } //if (textBox6.Text.Equals("")) //{ // MessageBox.Show("Please enter your amount"); // // } // else // { // this.Hide(); // } } private void button3_Click(object sender, EventArgs e) { this.Hide(); } private void textBox3_TextChanged(object sender, EventArgs e) { } private void textBox4_TextChanged(object sender, EventArgs e) { } private void textBox5_TextChanged(object sender, EventArgs e) { } private void panel2_Paint(object sender, PaintEventArgs e) { /*if (textBox3.Text.Equals("") && textBox4.Text.Equals("") && textBox5.Text.Equals("") && textBox6.Text.Equals("")) { button1.Enabled = false; } else { button1.Enabled = true; }*/ } } } Here's a "Pic" of my database http://s299.photobucket.com/albums/mm305/krsimms123/Code.jpg Thanks in advance (I'll try and check this every few hours so I can help explain anything)

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• C++ How fast is passing around objects?

  - by wndsr

  Assuming we are running a compiled C++ binary: Is passing around an int (e.g. function to function, or writing it into variables) slower than passing around structs/class objects like the following? class myClass { int a; int b; char c; vector d; string e; }

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• Have macro 'return' a value

  - by bobobobo

  I'm using a macro and I think it works fine - #define CStrNullLastNL(str) {char* nl=strrchr(str,'\n'); if(nl){*nl=0;}} So it works to zero out the last newline in a string, really its used to chop off the linebreak when it gets left on by fgets. So, I'm wondering if I can "return" a value from the macro, so it can be called like func( CStrNullLastNL( cstr ) ) ; Or will I have to write a function

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• Display unicode character in Actionscript

  - by Jan

  I have the unicode for that char, how do I display it? 0x023D2A textField.text = ???; i have have the name of the character. can I reference it by name?

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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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• error in c, but not in c++

  - by eswar

  const int t=5; char buf[t+5]; When I compile this gives error in C but not in C++!! Can anybody please explain me the reason? Note: I know the const defaults to internal linkage in 'C++', where as in 'C' it defaults to external linkage. Does it has any relation to the above case??

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• C++ static array leading to memory leak?

  - by MDonovin

  Lets say I have something like... void foo() { char c[100]; printf("this function does nothing useful"); } When foo is called, it creates the array on the stack, and when it goes out of scope, is the memory deallocated automatically? Or is c destroyed, but the memory remains allocated, with no way to access it/get it back except restarting the computer?

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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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• Struts html:checkbox query

  - by sarah

  Hi All, i have the following code . <td> <html:checkbox name="userForm" property="isActive" /></td> and in Form is have property called isActive of type char ,how would i get the checked value of it ,i am getting some symbols like 'o' if checked. I am using userform.getIsActive() ,where i am going wrong .I want 'y' or 'n' values

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• Why does MPI_Init accept pointers to argc and argv?

  - by iamrohitbanga

  this is how we use MPI_Init function int main(int argc, char **argv) { MPI_Init(&argc, &argv); … } why does MPI_Init use pointers to argc and argv instead of values of argv?

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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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• 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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• getchar() and putchar()

  - by gautam kumar

  is getchar() equivalent to scanf("%c",&a); is putchar(c) equivalent to printf("%c",a); where a is a char variable

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• Unicode escaping in C/C++

  - by Geo

  Hi guys! I'm having a dispute with a colleague of mine. She says that the following: char* a = "\x000aaxz"; will/can be seen by the compiler as "\x000aa". I do not agree with her, as I think you can have a maximum number of 4 hex characters after the \x. Can you have more than 4 hex chars? Who is right here?

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• Serializing Vector<String> to String

  - by dhroller

  I need to convert a Vector to a String (an vice versa) to be stored in a CHAR field in a database. What is the most efficient way to do this ?

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