Programming :: Calculate The Minutes Difference Between Two Dates Using The Function Mktime() On C++?
Jul 28, 2010
I'm trying to calculate the minutes difference between two dates using the function mktime() on c++. The dates will be passed to me as struct tm, and I will use this function many many times. The example below shows what I wanna do:
Code:
int main(int argc, char** argv) {
while (1) {
tm date2;
tm date1;
[code]...
I read the mktime() description on c++ reference, searched google... but there is no light
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Jul 12, 2010
I have a project in which many processes run. p1,p2,p3.
->There are some .so files are included in some process when needed example ppp.so in process p1 (when ppp is needed and will go like a plugin) but it has a init () function how a process includes a init() function ?
->process p1 has main function i.e main()
->so evry process has main() right ?
what is the difference between init () and main () functoins. where is init () used and how many init() a process van have ?
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Aug 6, 2009
I'm trying to use "date" to calculate some dates. I'm getting some wrong results and wonder, if I'm doing something wrong here. If someone has any idea or if your "date" works as expected, please post here. In case it works on your machine could you please tell me which version of coreutils you have installed? The example code I'm using follows. I first create a date, which should switch to a previous day if I substract some minutes. The code and the results I get:
Code:
bash-3.1$ REC_YEAR=2009
bash-3.1$ REC_MONTH=9
bash-3.1$ REC_DAY=1
bash-3.1$ REC_HOUR=0
[code]....
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Feb 4, 2010
How can I calculate minutes to the next 0:00 midnight is, in a shell script ? Example it may be 07:10 or 22:36 now and I want to find out how many minutes to the next 0:00 midnight is ?
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Oct 26, 2010
What is the real difference between system calls and normal function calls. Ultimately function calls too would be passed to kernel for some or the other work.
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Aug 3, 2010
A script to generate random dates. It uses the year range 2006-2009, and truncates every month of the year to an ordinary February's 28 days, but otherwise it's pretty solid and safe.
Code:
spate=1
while [ $spate -le 120 ]
[code]....
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Nov 16, 2010
Code:
#include <iostream>
using namespace std;
[code]...
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May 18, 2010
I am doing some Linux kernel programming for my research project. I need to record the timestamp (by using cpuid and rdtsc) when an interrupt handler (top half) is first invoked. Due to the time critical nature of the problem itself, I have to do the timestamping inside the interrupt handler itself (the first operation when the handler is called). However, I understand that tasks that are not so time critical should be deferred to a tasklet function (bottom half) for processing because other interrupts are disabled in a (top-half) interrupt handler. I am currently out of idea on how I can pass the timestamp information that I have obtained in the interrupt handler to the corresponding tasklet function.
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May 15, 2010
I'm writing a loganalysis application and wanted to grab apache log records between two certain dates. Assume that a date is formated as such: 22/Dec/2009:00:19 (day/month/year:hour:minute) Currently, I'm using a regular expression to replace the month name with its numeric value, remove the separators, so the above date is converted to: 221220090019 making a date comparison trivial.. but.. Running a regex on each record for large files, say, one containing a quarter million records, is extremely costly.. is there any other method not involving regex substitution? here's the function doing the convertion/comparison
[Code]...
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Jun 30, 2010
I want to calculate length of my array, say Unix here.
Code:
[linux1@HMLINUX1 abc]$ declare -a Unix=('Debian' 'Red Hat' 'Suse' 'Fedora');
[linux1@HMLINUX1 abc]$
[linux1@HMLINUX1 abc]$ echo ${#Unix[@]}
5
This should be ideally 4, but somehow it is showing as 5. However, when I am removing the space as RedHat instead of Red Hat, it is working perfectly.
Code:
[linux1@HMLINUX1 abc]$ declare -a Unix=('Debian' 'Redhat' 'Suse' 'Fedora');
[linux1@HMLINUX1 abc]$ echo ${#names[@]}
4
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May 24, 2011
i've been using a awk script to calculate my data... i have 3 files:
file a1.txt:
2
3
4
[code]....
the results were (3.5, 6 and 3) which is pretty easy.. now i want to combine all this into 1 file and each have different columns and called it avg.txt which have something like this in the end:
3.5 6 3
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Jan 28, 2010
i have a sorted file with many repeated lines like this:
1ujw
1ujw
1ul1
1us7
[code].....
i need to calculated haw many times each line is repeated, for ex
1ujw 2
1ul1 1
1us7 5
etc.
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Dec 12, 2008
I want to calculate log in bash script. I searched but could not find any bash command to directly do it. I am also thinking to send the variable in C program, calculate in C and get the answer back in bash script.But I think it is a long process. as I have to do this
i) gcc -o log log.c
ii) ./log > log_result.txt
iii) then read the result from log_result.txt
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May 11, 2011
im trying to calculate how much time does my program run, use very simple script
clock_t end, start;
start= clock();
int i;
printf("initial %d
",(int)start);
[Code]....
but it outputs 0 all the time. cant figure out where could be the problem.
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Apr 24, 2011
i have the example code below, i want to calculate the time taken for a sample program to run. but i keep getting undefined reference error.
#include <sys/time.h>
#include <iostream>
int main(int argc, char **argv) {
struct timeval startTime;
struct timeval endTime;
[Code]...
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May 3, 2011
i'm trying to write a program with c socket programming,what i am trying to reach is a program which will calculate a computer's downloaded data from the internet,just to know how much he/she download?
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Jun 11, 2010
E.g. 98 is represented as 1100010 (number of valid bits is 7)
What is the formula to calculate the number of valid bits in a byte ?
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Apr 10, 2011
ı need to calculate how many nanosecond the process takes . must give the same value every time (c++) ubuntu 10.10 my system information:
*-cpu
description: CPU
product: Intel(R) Core(TM)2 Duo CPU T7300 @ 2.00GHz
vendor: Intel Corp.
physical id: 400
[code]...
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Dec 30, 2010
I'm using pyqt3 for my app and am lost on even how to attempt this task... On a vinyl cutter to have the blade pivot it must be offset from the center of the shaft it's on so say for example a .25mm offset would leave a .25mm unwanted vinyl attachment when the cutting is done. I somehow have to average or extrapolate that .25mm xy coordinate and add it to the hpgl plot file as a PUx,y; command? I have enclosed a simple sample file that has three images in it. In the corresponding hpgl file everything between the PU commands that are starting with PD are the code for that image (star for eg the pu to move to next image and then all PD for the next image and so on, so once the formula or procedure is figured out it can be applied to as many images there are in the file. Placing the new command at the head of each image PD group. Since there are absolute and relative cutters I enclosed the same exact plot for both types as the coordinates on relative can be negative numbers. Only PU and PD commands and a ";" as a command delimiter as sometimes many commands are on one line.The offset variable will come from a spinbox but .25 is good for an example.
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Apr 8, 2011
Im doing a sudoku-solver as a school assigment in Java. It is supposed to solve both 6x6, 9x9 and 12x12 boards.Im pretty much done with my algorithm(brute force), but I'm having a hard time figuring out how to calculate the right Box for a Square. I found this snippet:
Code:
// calculate BoardPos for index, where index is 0..80
void loadBoardPosFromIndex(BoardPos &pos, int index) {
pos.index = index;
[code]...
This works on 9x9 boards, but I really dont get the math behind this, and how I can create a generic rule for both 6x6, 9x9 and 12x12 boards.
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Oct 12, 2010
i need to calculate the number of words containing letter e in a textfile.
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Jan 20, 2009
I'm trying to write a script that will calculate a directory size and if the size is greater than 4GB, it will send out an email. But I am getting the "integer operation expected" error when it tries to calculate the current disk size. Here's my script.
Code:
TO="user@email.com"
SUBJ="Ready for DVD burning on `hostname`"
MAIL="/bin/mail"
[code]....
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Mar 9, 2011
how to calculate (if possible) the end address of an image file in a flash memory. I'm trying to create a checksum and checkheader function and the info that I got is the file's offset, how many sector it consumes and its size. I kinda need the end address, sad thing is, I don't know how to calculate it.test.img's start address is 0, the size is 0x20000 and consumes 3 sectors.
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May 24, 2010
I want to declare a function in a function, but had no success till now, see the error code below and visit the project at sourceforge
[Code]...
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Jun 20, 2010
I looked on the net for such function or example and didin't find anything, thus after having made one i guess it would be legitimate to drop it to see what others thinks of it.
#!/bin/bash
addelementtoarray()
{
local arrayname=$1
[code]....
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Apr 4, 2011
I am trying to write a script to calculate the total amount of installed memory to use during an anaconda kickscript, so the swap file is created at 2 x the installed memory. I so far have the amount of installed RAM DIMMS but need a way to total them up and produce a varible I can use in the pre section of the install.
Code:
dmidecode -t 17 | grep Size | awk ' { print $2 }'
Output:
2048
2048
Note: on some servers there could be from 1 DIMM up to 16 DIMMS installed so the script needs to be able to handle this. I also can not use bc as it does not exist during the install stage. I am guessing I need a while loop to do this and use expr but do not know where to start for this logic.
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Feb 22, 2010
On Debian repo I found virtualbox-ose packages there. What will be the difference in operation/function between their packages and the packages download on virtualbox.org website?
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Feb 22, 2010
On Fedora repo I found VirtualBox-ose packages there. What will be the difference in operation/function between their packages and the packages download on virtualbox.org website?
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Sep 16, 2010
fit a surface i.e. W(x,y) using svdfit() provided by "Numerical Recipes in C". svdfit() is written for curve fitting and not for surface fitting.But one can use svdfit(), as claimed by authors of NR book, to do surface fitting. On page 680 of NR book, authors have given a hint on how to use svdfit() for fitting a surface. But I have not understood it.This link may be helpful (Chapter 15 th is relevant here.):[URL]This is my problem:
Code:
I have a set of 100 numbers. I want to fit a 2-Dimensional function W(x,y) to these numbers.
[code]....
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Aug 27, 2010
I am interested in learning 3D programming. The thing is, I would hate to put too much effort to learn something that doesn't have future and is dying. My favorite language at the time is Java. My goal is professional programming.
So I have several questions:
1. Should I learn JOGL or start learning C++ and do C++ openGL programming?
2. Is there a big difference between JOGL and C++ openGL programming?
3. Is it worth to learn openGL? Does it have a future?
4. Is it a big difference between openGL and directX coding?
5. If choosing Java, then JOGL or LWJGL?
Why and what is the main difference between them?
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