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  • Doubt on pointer conversion

    - by Simone
    Suppose we have the following code: #include <iostream> struct A { virtual void f() { std::cout << "A::f()" << std::endl; } }; struct B: A { void f() { std::cout << "B::f()" << std::endl; } }; void to_A(void* voidp) { A* aptr = static_cast<A*>(voidp); aptr->f(); } void to_B(void* voidp) { B* bptr2 = static_cast<B*>(voidp); bptr2->f(); } int main() { B* bptr = new B; void* voidp = bptr; to_A(voidp); // prints B::f() to_B(voidp); // prints B::f() } is this code guaranteed to always work as in the code comments or is it UB? AFAIK it should be ok, but I'd like to be reassured.

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  • 5 Steps to Impress First Time Site Visitors

    Have you ever given some thought to what you need to do to attract people to visit the website you just created for them? In case you haven't yet done so, let me take you through five basic steps which you should adhere to if you are looking for an increase in the daily hits to your website.

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  • Convert ToString to time format C#

    - by Michael Quiles
    Time.ToString("0.0") shows up as a decimal "1.5" for instead of 1:30 how can I get it to display in a time format. private void xTripSeventyMilesRadioButton_CheckedChanged(object sender, EventArgs e) { //calculation for the estimated time label Time = Miles / SeventyMph; this.xTripEstimateLabel.Visible = true; this.xTripEstimateLabel.Text = "Driving at this speed the estimated travel time in hours is: " + Time.ToString("0.0") + " hrs"; }

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  • C# float to decimal conversion

    - by Adrian4B
    Any smart way to convert a float like this: float f = 711989.98f; into a decimal (or double) without loosing precision? I've tried: decimal d = (decimal)f; decimal d1 = (decimal)(Math.Round(f,2)); decimal d2 = Convert.ToDecimal(f);

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  • Conversion of Single to two UInt16 values in .net

    - by Gio
    In the good old days of C. I could cast a float to an int (assuming 32 bit system), do some bit manipluation ( bitwise and, right shift, ect ), and get the upper and lower 16 bit hex representations of the floating point number, which I could then store in two short values. I'm not seeing an easy way of doing this in C#. System.Convert.ToUInt16 just does a float to int convert (even after I shift right), which leaves a vlaue of 0 if the float is less than 0, which is not the desired effect. //useless leaves me witg a value 0f 0 UIN16 s1 = (UInt16)((System.Convert.ToUInt32(d2) & 0xffff0000) >> 16); //capture the high word UInt16 s2 = (UInt16)(System.Convert.ToUInt32(d2) & 0xffff); //capture the low word A basic cast (UInt32) doesn't work either.

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  • Unicode To ASCII Conversion

    - by Yuvaraj
    Hi all, i creating an small application in Delphi 2009. here i got problem that when i run my application in WindowsXP its working but it is not working in Windows95. i know the problem that 95 will not support Unicode. if anyone knows the solution please tell me. and also i have one more idea that converting Unicode to ASCII. is it possible please tell how to do that. Thanks in Advance Worm Regards, Yuvaraj

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  • Conversion failed when converting the varchar value to data type int

    - by desi
    *I have a varchar(1000) column declared as field that contains all numbers, as shown below. And I want to execute the following script. I need this to work please Declare @PostalCode varchar(1000)=0 set @PostalCode ='7005036,7004168,7002314,7001188,6998955' Select hl.* From CountryLocation cl INNER JOIN refPostalCodes pc ON pc.PostalCode = hl.PostalCode where pc.Postalcode in (@PostalCode) and pc.notDeleted = 1

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  • Adding 30 minutes to time formatted as H:i in PHP

    - by bateman_ap
    Having a nightmare at the moment and just can't see why it isn't working I have a value in the form H:i (ie 10:00, 13:30) etc called $time What I want to do is create two new values, $startTime which is 30 mins before $time and $endTime which is 30 mins after $time I have tried the following but just doesn't seem to want to work $startTime = date("H:i",strtotime('-30 minutes',$time)); $endTime = date("H:i",strtotime('+30 minutes',$time)); If I pass through 10:00 as $time and echo out both $startTime and $endTime I get: $startTime = 00:30 $startTime = 01:30

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  • Conversion char[] to char*

    - by sijith
    may be this is a sizzle question but please help void Temp1::caller() { char *cc=Called(); printf("sdfasfasfas"); printf("%s",cc); } char *Temp1::Called() { char a[6]="Hello"; return &a; } Here how to print Hello using printf("%s",cc);

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  • Currency Conversion and display fetched from Server

    - by user198725878
    I am fetching the in app purchase items for my app from my web server.the web-server gives the product title, description and price... Currently i am displaying the each product using the product title,description and price.Currently i am showing the currency in $. Now i am having the doubt that , can i display the prices as such?when i referred some URL, it seems that prices needs to be localized. So do i need to display the prices localized which is fetched from my-server? please let me know how should i proceed? Thanks a lot for stopping by..

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  • Date Time conversion

    - by Zerotoinfinite
    Hi All, I am getting datetime as 1/2/2010 11:29:30 which I am displaying in a gridview. and I want to convert it to "Feb 1, 2010 at 11:29". Please let me know how to convert it like this. Thanks in advance. Note: I am using asp.net with C#.

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  • how to do this conversion?

    - by kumar
    string mvi = Moneys.GetValue(8) as string; if (mvi == null) money.Currency= Convert.ToDecimal(""); /// I am getting exception Here if its null? else money.Currency= Convert.ToDecimal(mvi); /// Currency is Decimal money.Currency= Convert.ToDecimal(""); /// I am getting exception Here if its null? Can any body tell me how to do this? thanks

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  • C++ Program performs better when piped

    - by ET1 Nerd
    I haven't done any programming in a decade. I wanted to get back into it, so I made this little pointless program as practice. The easiest way to describe what it does is with output of my --help codeblock: ./prng_bench --help ./prng_bench: usage: ./prng_bench $N $B [$T] This program will generate an N digit base(B) random number until all N digits are the same. Once a repeating N digit base(B) number is found, the following statistics are displayed: -Decimal value of all N digits. -Time & number of tries taken to randomly find. Optionally, this process is repeated T times. When running multiple repititions, averages for all N digit base(B) numbers are displayed at the end, as well as total time and total tries. My "problem" is that when the problem is "easy", say a 3 digit base 10 number, and I have it do a large number of passes the "total time" is less when piped to grep. ie: command ; command |grep took : ./prng_bench 3 10 999999 ; ./prng_bench 3 10 999999|grep took .... Pass# 999999: All 3 base(10) digits = 3 base(10). Time: 0.00005 secs. Tries: 23 It took 191.86701 secs & 99947208 tries to find 999999 repeating 3 digit base(10) numbers. An average of 0.00019 secs & 99 tries was needed to find each one. It took 159.32355 secs & 99947208 tries to find 999999 repeating 3 digit base(10) numbers. If I run the same command many times w/o grep time is always VERY close. I'm using srand(1234) for now, to test. The code between my calls to clock_gettime() for start and stop do not involve any stream manipulation, which would obviously affect time. I realize this is an exercise in futility, but I'd like to know why it behaves this way. Below is heart of the program. Here's a link to the full source on DB if anybody wants to compile and test. https://www.dropbox.com/s/6olqnnjf3unkm2m/prng_bench.cpp clock_gettime() requires -lrt. for (int pass_num=1; pass_num<=passes; pass_num++) { //Executes $passes # of times. clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &temp_time); //get time start_time = timetodouble(temp_time); //convert time to double, store as start_time for(i=1, tries=0; i!=0; tries++) { //loops until 'comparison for' fully completes. counts reps as 'tries'. <------------ for (i=0; i<Ndigits; i++) //Move forward through array. | results[i]=(rand()%base); //assign random num of base to element (digit). | /*for (i=0; i<Ndigits; i++) //---Debug Lines--------------- | std::cout<<" "<<results[i]; //---a LOT of output.---------- | std::cout << "\n"; //---Comment/decoment to disable/enable.*/ // | for (i=Ndigits-1; i>0 && results[i]==results[0]; i--); //Move through array, != element breaks & i!=0, new digits drawn. -| } //If all are equal i will be 0, nested for condition satisfied. -| clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &temp_time); //get time draw_time = (timetodouble(temp_time) - start_time); //convert time to dbl, subtract start_time, set draw_time to diff. total_time += draw_time; //add time for this pass to total. total_tries += tries; //add tries for this pass to total. /*Formated output for each pass: Pass# ---: All -- base(--) digits = -- base(10) Time: ----.---- secs. Tries: ----- (LINE) */ std::cout<<"Pass# "<<std::setw(width_pass)<<pass_num<<": All "<<Ndigits<<" base("<<base<<") digits = " <<std::setw(width_base)<<results[0]<<" base(10). Time: "<<std::setw(width_time)<<draw_time <<" secs. Tries: "<<tries<<"\n"; } if(passes==1) return 0; //No need for totals and averages of 1 pass. /* It took ----.---- secs & ------ tries to find --- repeating -- digit base(--) numbers. (LINE) An average of ---.---- secs & ---- tries was needed to find each one. (LINE)(LINE) */ std::cout<<"It took "<<total_time<<" secs & "<<total_tries<<" tries to find " <<passes<<" repeating "<<Ndigits<<" digit base("<<base<<") numbers.\n" <<"An average of "<<total_time/passes<<" secs & "<<total_tries/passes <<" tries was needed to find each one. \n\n"; return 0;

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  • Sync clock on Windows XP machine to external (non-domain, non-workgroup) Windows Server 2008 R2 machine

    - by Eric
    I have two machines and I'd like their clocks to be in sync for various reasons. Machine 1 is an XP machine located in the office. Machine 2 is a VPS hosted by a third party running Windows Server 2008 R2. These machines are not in any kind of workgroup or on a domain together. They are completely separate machines. Machine 2 is currently syncing once a week to time.windows.com. The clock on Machine 2 does seem to wander a bit within that week interval. What I would like to do is have Machine 1 set its clock based on the clock of Machine 2. I have tried configuring w32tm on the XP machine. This is what I used for configuration: w32tm /config /syncfromflags:manual /manualpeerlist:"<ip address of machine 2>" However, whenever I issue the /resync command I get "The computer did not resync because no time data was available". I have made sure to start the windows time service on machine 2, and I have added firewall exceptions for UDP port 123. Is there something I need to configure on Machine 2 (other than just starting the time service) in order to get it to respond? Edit: I have also run w32tm /config /reliable:YES /update on Machine 2. I am still getting "The computer did not resync because no time data was available". Is there something else I'm missing?

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  • What should I be doing while I wait for a progress bar?

    - by Malnizzle
    So I am sitting here waiting for a progress bar to run (20 mins or so), and was wondering how best to use my time as a SysAdmin. I debated not posting this question briefly, as this could get flagged as subjective, but I think it's an important question, and a question that can be legitimately answered (per the FAQ) I know this something a lot of sys admins deal with, especially if they are client-based I would venture to guess. There is a lot of material out there about how to multi task, but SysAdmin work is unique in this area as well. I could switch over to another project, but I could get wrapped up in that, and forget about the original project I was working on, and that's hard if you are billing a client for your time, both for tracking your time, as well as being fair to that client. I could check ServerFault, but that isn't directly work related, I could sort my email, so on and so forth. What do you do, or what should I do when I have time waiting for a progress bar? Thanks! (download done, back to work!)

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