dev-cpp-users

[Dev-C++] System specific?

[<v-...@ou...>]

Hello,

In university I am doing a programming course and last week we had an  
excercise using a given function to measure time:

----------------------------8< schnipp------------------------------
double MyTime() {
  struct timeval Tp;
  gettimeofday (&Tp, NULL);
  return Tp.tv_sec + (Tp.tv_usec /10000000.);
}
----------------------------schnapp >8------------------------------

At home I wanted to finish the program using Dev-C++ (current beta with  
fixed exe), but the compiler refused work when compiling this function  
with the message

----------------------------8< schnipp------------------------------
aggregate `struct timeval Tp' has incomplete type and cannot be  
initialized
----------------------------schnapp >8------------------------------

But in university (under Linux) it does work....so is this a problem of  
the compiler (gcc versions differ in university and at home) or a  
platform problem (Linux specific parts)? Sorry, I am no expert, just had  
two weeks of this course and I am only used to basic (under DOS).
 
Chau

V-Li

Re: [Dev-C++] System specific?

[Hongli L. <h....@ch...>]

On Mon, 2002-05-13 at 18:45, Christian Faulhammer wrote:
> Hello,
> 
> In university I am doing a programming course and last week we had an  
> excercise using a given function to measure time:
> 
> ----------------------------8< schnipp------------------------------
> double MyTime() {
>   struct timeval Tp;
>   gettimeofday (&Tp, NULL);
>   return Tp.tv_sec + (Tp.tv_usec /10000000.);
> }
> ----------------------------schnapp >8------------------------------
> 
> At home I wanted to finish the program using Dev-C++ (current beta with  
> fixed exe), but the compiler refused work when compiling this function  
> with the message
> 
> ----------------------------8< schnipp------------------------------
> aggregate `struct timeval Tp' has incomplete type and cannot be  
> initialized
> ----------------------------schnapp >8------------------------------
> 
> But in university (under Linux) it does work....so is this a problem of  
> the compiler (gcc versions differ in university and at home) or a  
> platform problem (Linux specific parts)? Sorry, I am no expert, just had  
> two weeks of this course and I am only used to basic (under DOS).
>  
> Chau
> 

I believe you need tin #include <sys/time.h>

[Dev-C++] System specific?

[<v-...@ou...>]

Hi Hongli,

>> ----------------------------8< schnipp------------------------------
>> double MyTime() {
>>   struct timeval Tp;
>>   gettimeofday (&Tp, NULL);
>>   return Tp.tv_sec + (Tp.tv_usec /10000000.);
>> }
>> ----------------------------schnapp >8------------------------------
> I believe you need tin #include <sys/time.h>
 As I stated: Under Linux it does compile, and time.h is included, so  
this should be no problem. Below a list of all included header files.

#include <iostream>
using std::cout; using std::cin;
#include <cstdlib>
using std::rand; using std::srand;
#include <sys/time.h>
#include <cmath>
using std::fmod;
#include <iomanip>
using std::setprecision;
 
Chau

V-Li

RE: [Dev-C++] System specific?

[Ioannis V. <no...@ho...>]

> -----Original Message-----
> From: dev...@li... 
> [mailto:dev...@li...] On Behalf 
> Of Christian Faulhammer
> Sent: Monday, May 13, 2002 7:45 PM
> To: To: dev...@li...
> Subject: [Dev-C++] System specific?
> 
> 
> Hello,
> 
> In university I am doing a programming course and last week we had an
> excercise using a given function to measure time:
> 
> ----------------------------8< schnipp------------------------------
> double MyTime() {
>   struct timeval Tp;
>   gettimeofday (&Tp, NULL);
>   return Tp.tv_sec + (Tp.tv_usec /10000000.);
> }
> ----------------------------schnapp >8------------------------------
> 
> At home I wanted to finish the program using Dev-C++ (current 
> beta with
> fixed exe), but the compiler refused work when compiling this function
> with the message
> 
> ----------------------------8< schnipp------------------------------
> aggregate `struct timeval Tp' has incomplete type and cannot be
> initialized
> ----------------------------schnapp >8------------------------------
> 
> But in university (under Linux) it does work....so is this a 
> problem of
> the compiler (gcc versions differ in university and at home) or a
> platform problem (Linux specific parts)? Sorry, I am no 
> expert, just had
> two weeks of this course and I am only used to basic (under DOS).


For portable code use the functions provided in time.h . There is much
useful stuff in there.



Ioannis

* Ioannis Vranos
* Programming pages: http://www.noicys.cjb.net
* Alternative URL: http://run.to/noicys

[Dev-C++] System specific?

[<v-...@ou...>]

Hi Ioannis,

> For portable code use the functions provided in time.h . There is much
> useful stuff in there.
 Good idea....if I could understand how to use it. The original function  
has been given to us by our teacher as a help...it's for three weeks now  
that I am in contact with C++. This routine should return a time (no  
matter which, but in seconds would be great), so I can measure the time  
passed from start to end of the task given to the user. Is there a  
portable solution or does the original function only work with gcc  
greater than 2.95.3 (perhaps gcc 3.x)?
In the code I use MyTime as follows:

----------------------------8< schnipp------------------------------
start=3DMyTime();
[task]
end=3DMyTime();
complete=3D(end - start) + (10 * penaltycounter);
----------------------------schnapp >8------------------------------

You understand what I want? ;)
 
Chau

V-Li

RE: [Dev-C++] System specific?

[Ioannis V. <no...@ho...>]

clock_t clock(void); It returns the processor time that the program has
spent so far from the beginning of its execution.

 clock()/CLOCKS_PER_SEC is that time in seconds (integer).

#include <iostream>
#include <ctime>

void useless()
{
  for(int i=0; i<1024*1024*1024; i++)
     ;
}     



int main()
{
  using namespace std;

  clock_t t1, t2;

  for(int i=0; i<100*1024*1024; i++)
     ;

  t1=clock();
  
  cout<<"Time passed since the beginning of the program :"<<t1<<endl;
  cout<<"In seconds: "<< t1/CLOCKS_PER_SEC<<endl;
  
  t1=clock();
  
  useless();
  
  t2=clock();
  
  cout<<"\nuseless() took "<<t2-t1<<" to complete\n";
  cout<<"In seconds: "<<(t2-t1)/CLOCKS_PER_SEC<<endl;
}  
  
  


Ioannis

* Ioannis Vranos
* Programming pages: http://www.noicys.cjb.net
* Alternative URL: http://run.to/noicys


> -----Original Message-----
> From: dev...@li... 
> [mailto:dev...@li...] On Behalf 
> Of Christian Faulhammer
> Sent: Monday, May 13, 2002 10:23 PM
> To: dev...@li...
> Subject: [Dev-C++] System specific?
> 
> 
> Hi Ioannis,
> 
> > For portable code use the functions provided in time.h . 
> There is much
> > useful stuff in there.
>  Good idea....if I could understand how to use it. The 
> original function
> has been given to us by our teacher as a help...it's for 
> three weeks now
> that I am in contact with C++. This routine should return a time (no
> matter which, but in seconds would be great), so I can 
> measure the time
> passed from start to end of the task given to the user. Is there a
> portable solution or does the original function only work with gcc
> greater than 2.95.3 (perhaps gcc 3.x)?
> In the code I use MyTime as follows:
> 
> ----------------------------8< schnipp------------------------------
> start=MyTime();
> [task]
> end=MyTime();
> complete=(end - start) + (10 * penaltycounter);
> ----------------------------schnapp >8------------------------------
> 
> You understand what I want? ;)
> 
> Chau
> 
> V-Li
> 
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[Dev-C++] System specific?

[<v-...@ou...>]

Hi Ioannis,

> clock_t clock(void); It returns the processor time that the program
> has spent so far from the beginning of its execution.
 Ok, that would do, thank you very much....
 
Chau

V-Li