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calling system clock?

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Join Date: Jun 2006

Posts: 1,169

Reputation: Duki has a spectacular aura about

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Duki

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Veteran Poster

calling system clock?

Oct 22nd, 2007

Hey guys,

we were given an opportunity for extra credit in my OOP class. We're going over recursion and my prof said if we could do a project using recursion and do another useing iterative statments, and time them, we would be given extra cred.

Is there a way to call the system clock at the begining of the loop and at the end; then subtract the 1st from the 2nd? Is there an easier way than this?

It is practically impossible to teach good programming style to students that have had prior exposure to Basic; as potential programmers they are mentally mutilated beyond hope of regeneration.

-Edsger Dijkstra

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Join Date: Oct 2007

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Ptolemy

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Junior Poster in Training

Re: calling system clock?

Oct 22nd, 2007

You can use the standard time library to do it, sort of:

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 C++ Syntax (Toggle Plain Text) 
#include <ctime>
#include <iostream>
 
void long_running_operation()
{
  for ( unsigned i = 1; i != 0; i++ )
    ;
}
 
int main()
{
  std::clock_t start;
  std::clock_t end;
 
  std::cout<<"Beginning timer..."<<std::endl;
  start = std::clock();
 
  long_running_operation();
 
  end = std::clock();
  std::cout<<"The operation took "
    << ( double ( end ) - start ) / CLOCKS_PER_SEC
    <<" seconds\n";
}
#include <ctime>
#include <iostream>

void long_running_operation()
{
  for ( unsigned i = 1; i != 0; i++ )
    ;
}

int main()
{
  std::clock_t start;
  std::clock_t end;

  std::cout<<"Beginning timer..."<<std::endl;
  start = std::clock();

  long_running_operation();

  end = std::clock();
  std::cout<<"The operation took "
    << ( double ( end ) - start ) / CLOCKS_PER_SEC
    <<" seconds\n";
}