C++ :: Fwrite Calculating Elapsed Time
Jan 23, 2013
I would like to actually have some measure of roughly how long it takes to do a fwrite to a drive. When I do the following:
clock_t begin = clock();
unsigned long long size_t = fwrite(send, 1, transfer_size*sizeof(unsigned long long), wpFile);
clock_t end = clock();
double long elapsed_secs = double long(end - begin) / CLOCKS_PER_SEC;
Unfortunately, I don't get any different result for different transfer size!!!
My guess is that the clock_t , once it issues a fwrite command, some how stops its measurement, and it comes back again, when I am already done with fwrite. I do get the almost same measure, whether my transfer size is 32KB Byte or 16MB ! Which I was indeed expecting to see a huge difference.
I wouldn't really want the exact real timing measure (well off course it will be nice to know); and all I care about is to see some difference in time whether I am doing KB transfer vs MB transfer. Any other function that will give me some rough measurement of the actual time being elapsed for fwrite function?
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Jan 24, 2013
I have a question. I would like to actually have some measure of roughly how long it takes to do a fwrite to a drive. When I do the following:
clock_t begin = clock();
unsigned long long size_t = fwrite(send, 1, transfer_size*sizeof(unsigned long long), wpFile);
clock_t end = clock();
double long elapsed_secs = double long(end - begin) / CLOCKS_PER_SEC;
Unfortunately, I don't get any different result for different transfer size!!!
My guess is that the clock_t , once it issues a fwrite command, some how stops its measurement, and it comes back again, when I am already done with fwrite. I do get the almost same measure, whether my transfer size is 32KB Byte or 16MB ! Which I was indeed expecting to see a huge difference. I wouldn't really want the exact real timing measure (well off course it will be nice to know); and all I care about is to see some difference in time whether I am doing KB transfer vs MB transfer.
Some rough measurement required of the actual time being elapsed for fwrite function?
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Mar 13, 2013
I am looking for a function or any example that shows elapsed time in seconds and minutes. I didn't find any solution for both OS Win and Linux. I am looking for example that works for both - win and linux.
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Aug 6, 2012
In my class I'm trying to display the elapsed time as my label on a windows form. I've been reading up on all the different articles online and have tried these three methods all with the same result:
1. Using the System.Timers class
2. Built in Timer sub-class
3. Defining directly inside of my class the StartTime, etc. variables.
All of these still result in the following error:
Cross-thread operation not valid: Control 'User_Interface' accessed from a thread other than the thread it was created on.
Currently, my windows form is being called by another class, but I'm not sure if this is the cause of the problem.
This is a sample of the code that I'm currently using to show the elapsed time:
private void OnTimedEvent (object source, ElapsedEventArgs c)
{
TimeSpan time;
currentTime = DateTime.Now;
[Code].....
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Mar 5, 2014
I want to find out the time difference,say i start walking from my home at 23 hr 10 min 25 seconds and I reach destination at 1 hr 10 min 25 seconds.. I know here the time difference is 1 hr 55 min 55 seconds. But how am I gonna calculate this?
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Jun 13, 2014
I have a problem with calculating the CPUtime. I am using CPLEX to solve linear programming with 3 diferent algorithms.
1-primal Simplex
2-Dual Simplex
3-Barrier Method.
When I am trying to use Barrier method, my clock does not give me a right processing time. I don't have any problem with the other two methods. The value I am getting from ticks2 is 0 when I am using Barrier solver unlike the two other methods that I am getting some small values (ticks1 is fine). Using time_t ticks1 , ticks2 and time(&ticks1) and finally difftime(ticks1,ticks2) also gives me an integer number which is not precise enough. I need a way to compute cputime with accuracy of at least 2 decimals.
clock_t ticks1,ticks2;
double solvingtime
if (solver.primopt==1){
ticks1=clock();
status=CPXprimopt(myEnv, myLP);
ticks2=clock();
[code]....
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Oct 22, 2013
I have to write a program for class in which users will be inputting:
start time = startTime
number of minutes = callDuration
so first off, teacher wants us to input time as a floating point number such as 09.00
How do I validate the time so that users cant input i.e. 09.61 for every hour? In other words, so the user cant input minutes 60-99 for every hour.
then, when calculating:
endTime = startTime + callDuration
how would I make endTime display a correct time in such a situation: endTime = 09.45 + 00.30
so that it displays 10.15 not 09.75
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Mar 9, 2013
I have the following code:
Code:
void Plot(int nx, int ny, double x[350], double y[350], double C_new[350][350], int iplot){
int i, j;
char fname[50];
FILE *fp;
[Code]....
I am then taking the generated file and importing it into a plotting program (Techplot360). It would speed up the importing process if I created a binary file instead of a like above. I know that I need to use fwrite but I am unsure how to handle lines like
Code:
fprintf(fp, "TITLE= ABCDEFG_%d
", iplot); and
Code: fprintf(fp, "%f %f %f
", x[i], y[j], T_new[i][j]);
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Jul 20, 2014
I'm currently working on a program that writes an array of struct to a file and then read back the data from the file to another array of struct. At the bottom is an image of my result.
My goal is to end up with two identical struct arrays but my program fails to do this. My struct have to members: ID and kind (of animals in this case). I declare my first arraystruct africa[] with "monkey" and "giraffe" with their respectively IDnr: 112 and 555. I stream this data to a file and read read them back to the arraystruct get_animal[]. Simply I want the get_animal[] to be identical with the africa[] when the program is over, but that is not so. According to my result(bottom image) it display:
112, monkey (get_animal[0])
112, monkey (get_animal[1])
meaning that get_animal[0] is identical to africa[0] get_animal[1] is also identical to africa[0]
but why? I want get_animal[1] to be identical with africa[1]. meaning I want the result to look like this:
112, monkey
555, giraffe
I've also made the program to print the parameters of my fwrite/fread calls. Why is the 3rd parameter = 1 meaning that only 1 element will be read/written when my program just read/write 2 elements?
Code:
main(){
FILE *fp;
struct animals
{
int id;
char kind[20];
} africa[1] = {{112,"monkey"}, {555,"giraffe"}};
}
[code]....
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Jul 5, 2013
I have union of pointer.
union {
short *two_int;
int *four_int;
double *eight_real;
char *one_ascii;
// void *v;
};
We have write function which write into file.
fwrite (r.one_ascii, 1, i, outstr);
I found one thing,When we write function, we fill only four int in following way.
r.four_int[0] = x + xoff;
r.four_int[1] = y + yoff;
So my question,we fill four_int but write one_ascii only.As is it union of pointer. So it does not matter. I am using 64bit machine and do not have any issue in 32 bit machine.
For more information: [URL] ....
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Mar 13, 2013
Code:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main() {
[Code]....
this code asks the user to input words/strings until he enters "end."after that, the program must copy the input to a text file named read.txt...I entered 'j' and then 'end' and after that I looked at the read.txt file and here's what's in it.
Output:
Code:
j
; end
some weird characters appeared!! the characters in the text file should only be.
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Jun 28, 2013
I am trying to write a function to reverse a wav file. The idea is to copy the header as it is from the begening of the input.wav file to the beginning of the output.wav file. After that i have to take count number of bytes(count = numberChannels * bitsPerSample in the wav i use this is 2*16= 32 bits, 32/8 = 4 bytes). With this code i am trying to copy the header( that's working fine) and then copy 10 samples from the end and put them to the output.wav file(after header not at the beginning).
This is the content of the input file:
The last 4 bytes of the header are bolded.
Code:
52 49 46 46 24 bd 01 00 57 41 56 45 66 6d 74 20
10 00 00 00 01 00 02 00 44 ac 00 00 10 b1 02 00
04 00 10 00 64 61 74 61 00 bd 01 00 00 10 00 10
ff 00 10 00 00 10 00 10 00 00 ff 10 10 10 00 10
00 00 00 10 10 10 10 00 00 00 10 00 10 00 10 ff
00 10 00 00 10 00 ff 00
This is the content of the output file it suppose to have in my example
Code:
52 49 46 46 24 bd 01 00 57 41 56 45 66 6d 74 20
10 00 00 00 01 00 02 00 44 ac 00 00 10 b1 02 00
04 00 10 00 64 61 74 61 00 bd 01 00 10 00 ff 00
00 10 00 00 10 00 10 ff 00 00 10 00 10 10 10 00
00 00 00 10 10 10 00 10 00 00 ff 10 00 10 00 10
ff 00 10 00
Code:
void reverse(char **array) {
int i=0;
word numberChannels;//word is unsigned short int , byte is unsigned char
word bitsPerSample;
[Code] .....
The problem is that (having in mind per sample is 4 bytes) instead of copying 40 bytes it just copies 20
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Jan 21, 2015
I try to crypt file with XOR instruction, by always receive segmentation fault. What's wrong with it?
Code:
#include <stdio.h>
main() {
FILE *fin,*fout;
char buff[40];
int a=0x11;
int i=0;
[Code] ....
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Mar 10, 2015
This is a round robin execution. with gantt chart. arrival time and burst time. I think there is an error in my formula to get the right answer,i cant resolve it but my program is running. What is the code or the right formula??
#include<stdio.h>
int main(){
int i,j=0,n,time,remain,flag=0,ts;
int sum_wait=0,sum_turnaround=0,at[10],bt[10],rt[10];
int ganttP[50],ganttStartTime[50];
printf("Enter no of Processes : ");
scanf("%d",&n);
remain=n;
[Code] ....
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Oct 28, 2014
I am trying to write my files to another subfolder . Below is my program.
Code:
cat th6.c
#include <pthread.h>
#include <stdio.h>
#include <string.h>
#define SIZE 8
#define NUMELM 8
[Code] ....
I observe my filename along with directory as text in the new file created in sublfolder. This is output.
[cporgs/apue/threads]: mkdir first
[cporgs/apue/threads]: ./a.out test.txt first
test.txt -- first/test.txt
dfdfdfdfdfdfdf-14
dfdfdfdfdfdfdf-14
in thread test.txt first
[cporgs/apue/threads]: cat first/test.txt
dfdfdfdfdfdfdffirst/test.txt
[cporgs/apue/threads]: cat test.txt
dfdfdfdfdfdfdf
I could not able to get from where this filename and folder is getting added.
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May 1, 2013
So I'm trying to learn how to use time for time based movement and what not. I did this only knowing the command time(&variable)
time_t timer;
int I, X;
void main() {
time(&timer);
X=timer;
while(I==5) {
[Code] ......
There's probably some other better way to do it... Obviously but for now I see it as putting current time in X.
start while
take in time constantly until I is 5
constantly asking is time>X(preset time 5 seconds ahead)
if it is
display message and add one to I
Why doesn't this display my message after 5 seconds?
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Nov 29, 2013
Finally got a programme partially working, why the values are not showing? Is this down to incorrect formula or i havent declared the values etc?
Code:
#include <stdio.h>
#include <math.h>
float timeconstant(float R, float C);
float R;
float C;
float time_c;
[Code] ....
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Oct 21, 2013
I've been trying to calculate the Second standard deviation but the average in the second loop isn't calculating correctly which is causing the standard deviation (method 2) to not calculate correctly. I can't find anything wrong.
Code:
#include <iostream>#include <iomanip>
#include <string>
#include <fstream>
#include <cmath>
usingnamespacestd;
int main ()
[Code]...
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Mar 14, 2013
Currently I am working on a program where you enter in a date 14 03 2013 (Day, Month, Year) and you get the next day. I seem to be coming stuck with months with less than 31 days, and the whole leap year thing. Here is my code so far.
Code:
#include <stdio.h>
int day, month, year, next_day, next_month, next_year, calculation;
int main() {
printf("Enter a date in the form day/month/year: ");
scanf("%d %d %d", &day, &month, &year);
[Code] .....
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Feb 19, 2014
As part of a project i want to display the speed of a small wheel on a 7 segment display. I am using a hall effect sensor to pick up the pulses of the rotation. I am not sure how to write a programe on C to calculate the RPM from this....
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Sep 28, 2014
I am having trouble with my C++ program. My program asks the user to enter any number greater than 0 and less than 20, and if the user enters any number(s) outside the acceptable range, the output should display:
input outside of exceptable range > 0 and < 20
length: 1 width: 1 area: 1 perimeter: 1
But in my program, this output displays no matter what the user types (even if the numbers are in the acceptable range, when it should be displaying the length and width the user enters and also displaying the calculated perimeter and area whenever the user enters number(s) in the acceptable range. Here is my code:
#include <iostream>
using namespace std;
float class_rectangle_area();
float class_rectangle_perimeter();
float class_rectangle_length();
float class_rectangle_width();
[Code] .....
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Dec 4, 2013
I am just learning arrays, I modified my program to use arrays but now it wont calculate the gross pay well it seems it does but not correctly. The gross pay is coming back as "-9.25596e+061" it worked fine before I added arrays. I do have a text file with the following input :
John Doe 1404 45 20 H
Bobby Jill 1404 45 20 S
#include <iostream>//including library (directive header file)
#include <windows.h>//makes console look pretty
#include <fstream>//Library to read files
#include <iomanip>
using namespace std;
int main() {
SetConsoleTitleW(L"Payroll System");//Set Console Title
[Code] .....
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Dec 10, 2014
Write a program to compute average grades for a course. The course records are in a single file and are organized according to the following format: Each line contains a student's first name, then one space, then the student's last name, then one space, then some number of quiz scores that, if they exist, are separated by one space. Each student will have zero to ten scores, and each score is an integer not greater than 100. Your program will read data from this file and write its output to a second file. The data in the output file will be nearly the same as the data in the input file except that you will print the names as last_name, first_name and there will be one additional number at the end of each line: the average of the student's ten quiz scores.
The output file must be formatted such that first and last names appear together in a left justified column that is 20 characters wide where the last name comes first, then a comma and a space and then the first name. Use your read string function to read each name separately and then put them together into a larger correctly formatted string before trying to output them. Each quiz score should be listed in a right justified column that is 4 characters wide, and the average should appear in its own right justified column that is 10 characters wide.
Note that if a student has fewer than 10 scores, the average is still the sum of the quiz scores divided by 10; these students are assumed to have missed one or more of the quizzes. The output file should contain a line (or lines) at the beginning of the file providing appropriate column headings.
This is how much I have so far:
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
char* read_string(char* buffer, int max_size, FILE* fp);
int main(int argc, char *argv[]) {
FILE *fp_input, *fp_output;
[code]....
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Nov 20, 2014
my code is working as expected except a slight error, i have to find min max and median values of an inputed array terminated by 0, the problem im having is with calculating the minimum, where when i enter 0 to terminate the program it uses 0 as the minimum value. my code is as follows
public static void FindAverages()
{
try
{
[Code]....
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Apr 3, 2014
I wrote a function to calculate the hypotenuse of a triangle. My code looks fine but when i enter the two sides it does not give out the right answer. I really don't know what to do.
#include <stdio.h>
#include<Windows.h>
#include<math.h>
double hypotenuse(double side1, double side2);
int main(void){
double side1, side2, hyp;
[Code] .....
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Mar 16, 2013
When I compile my code with g++ I get the error: constructor, destructure or type conversion missing before sum.
int sum(int,int);
void sum(int,int,int&);
main()
sum (v) // This is the line that the compiler is reporting the error occurs.
answer sum()
int main(){
int a=1;
int b=2;
int sum;
[Code] ....
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