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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 gems/plugins can be used for Unsubscribe support in Rails?

    - by user550575
    What gems/plugins that make it easy to add a tamper-resistant unsubscribe link to the bottom of the email a user can click to prevent receiving email those types of emails? The only thing I could find was http://kevinlochner.com/handling-unsubscribe-requests-in-ruby-on-rail which works but is somewhat unsophisticated and lacks features such as which type of emails to unsubscribe from. It also doesnt include the mechanism for users to unsubscribe. We using ActionMailer.

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  • Including huge string in our c++ programs ?

    - by Xinus
    I am trying to include huge string in my c++ programs, Its size is 20598617 characters , I am using #define to achieve it. I have a header file which contains this statement #define "<huge string containing 20598617 characterd>" When I try to compile the program I get error as fatal error C1060: compiler is out of heap space I tried following command line options with no success /Zm200 /Zm1000 /Zm2000 How can I make successful compilation of this program? Platform: Windows 7

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  • php fetch user data from mysql

    - by milodinosaur
    hi, currently i have 2 table in mysql structure: messages id | content | user_id | time submessages id | subcontent | msg_id | user_id | time submessages msg_id is FK for messages id. Now i need to query from php $cur_user = $user->current; // current user id. SELECT * FROM messages WHERE id > '{$_GET['id']}' // problem here how do i query submessages that posted by others not include current user? thank you.

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  • redefinition c++

    - by coubeatczech
    hi, how does header including in c++ work? I have the classes already implemented in .h file and when there is #include in two files, there's this error: files.h:14:7: error: redefinition of ‘class abstract_file’ files.h:14:20: error: previous definition of ‘class abstract_file’ multiple times for each class and enum. Can anyone explain this?

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  • How to compare two vectors, in C++

    - by Vincenzo
    This is my code: #include <algorithm> void f() { int[] a = {1, 2, 3, 4}; int[] b = {1, 2, 100, 101}; // I want to do something like this: // int* found = compare(a[0], a[3], b[0]); // in order to get a pointer to a[2] } Maybe I missed this algorithm in the manual… Please help :)

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  • Putting methods in separate files

    - by Garry
    I have a class (MyClass) with a lot of methods. Consequently, the .m file has become quite difficult to read. I'm relatively new to Objective-C (having come from REALbasic) and I was wondering if it's possible to put some of the methods in MyClass into different files and then include them in the class. How would I go about this in Xcode?

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  • SharePoint: Why is the Page property in my web part null?

    - by paul
    I am trying to include an Image control within my web part. In EnsureChildControls I have the following code: Image image = new Image(); image.ImageUrl = this.Page.ClientScript.GetWebResourceUrl(this.GetType(), "hotline.jpg"); I get a NullPointer exception and this is because 'Page' is null. Why might this be? Am I doing this all wrong anyway?

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  • Array help in C++

    - by user267237
    I am writing a program that is declaring an array of 100 integer numbers and filling the array with random numbers using rand(). All I have so far is: #include <iostream> using namespace std; int main() { int random_integer = rand();

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  • Pointers in c/c++

    - by jammkie same
    include void main() { int p[]={0,1,2,3,4}; int *a[]={p,p+1,p+2,p+3,p+4}; printf("%u %u %u %u",a,a,(*a)); } What should be the output of the above code? And if we make array p as static(static int p[]), output gets changed .Why?

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  • something about C++ unnamed namespace.

    - by Javran
    #include <iostream> namespace { int a=1; } int a=2,b=3; int main(void) { std::cout<<::a<<::b; return 0; } I complie it with my g++,but the output is 23, who can explain it? is that a way to get access to the <unnamed> namespace ::a?

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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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  • When To Use this.method()?

    - by Soo
    Hi SO, and happy Friday I have a question regarding the use of this.method();. My code seems to work without using the this., but I include it because it seems like the right thing to do. When should .this be used, and because it's presence doesn't always make a difference, what's the best practice for .this?

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  • having an issue about the output in c programming ..

    - by user2985811
    i'm having a problem on running the output after putting the input.. the output doesn't show after i put the variables and i don't know how to set the code .. so if you guys could help me with this, that would be grateful.. #include <stdio.h> #include <conio.h> int read_temps (float temps[]); int hot_days (int numOfTemp, float temps[]); int printf_temps (int numOfTemp, float temps[], int numOfHotDays); int main (void) { int index = 0; float tempVal; float temps[31]; int numOfTemp, numOfHotDays; do { printf ("Enter the temperature:"); scanf ("%f", &tempVal); if (tempVal!=-500.0) { temps[index] = tempVal; index++; } } while (tempVal != -500.0); return ; { int i; int count = 0; for (i = 0; i < numOfTemp; i++) { if (temps[i] > 32.0) count++; } return count; } { float sum = 0.0; int i; printf ("\nInput Temperatures:"); printf ("\n-------------------------"); for (i = 0;i < numOfTemp; i++) { printf ("\nDay %d : %.2fF", i+1, temps[i]); sum = sum + temps[i]; } printf ("\nNumber of Hot Days : %d", numOfHotDays); printf ("\nAverage Temperature: %.2f", sum/numOfTemp); } { clrscr (); numOfTemp = read_temps (temps); numOfHotDays = hot_days (numOfTemp, temps); clrscr (); printf_temps (numOfTemp, temps, numOfHotDays); getch (); } }

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  • CSS: background:#252 or background-color:#252? will the first cause the browser to assume the same a

    - by nick
    if for a class i include "background:#252", the browser will assume the rest of the background properties that i didn't specify. If instead I used "background-color:#252", would it cause the browser to assume the exact same about the rest of the background properties that i leave unspecified? background:#252 is shorter, but i wonder if it would be better to use background-color:#252? thanks.

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