CODEWITHSUNDEEP
c++time.h
hv16
hv16

Reputation: 19

How to calculate time in c++?

I'm trying to figure out how to calculate time in c++ . I'm making a program where every 3 seconds an event happens for example print out "hello" etc;

Upvotes: 1

Views: 891

Answers (3)

Johnny Mnemonic
Johnny Mnemonic

Reputation: 3912

Here's an example using two threads so your program won't freeze and this_thread::sleep_for() in C++11:

#include <iostream>
#include <chrono>
#include <thread>

using namespace std;

void hello()
{
    while(1)
    {
        cout << "Hello" << endl;
        chrono::milliseconds duration( 3000 );
        this_thread::sleep_for( duration );
    }
}

int main()
{
    //start the hello thread
    thread help1(hello);
    //do other stuff in the main thread
    for(int i=0; i <10; i++)
    {
        cout << "Hello2" << endl;
        chrono::milliseconds duration( 3000 );
        this_thread::sleep_for( duration );
    }
    //wait for the other thread to finish in this case wait forever(while(1))
    help1.join();
}

Upvotes: 3

JackSparrow
JackSparrow

Reputation: 707

It is dependent on your OS/Compiler.

Case 1:
If you have C++11 then you can use as suggested by Chris:
std::this_thread::sleep_for() // You have to include header file thread

Case 2:
If you are on the windows platform then you can also use something like:

#include windows.h 
int main () 
{ 
    event 1; 
    Sleep(1000); // number is in milliseconds 1Sec = 1000 MiliSeconds 
    event 2; 
    return 0; 
}

Case 3:
On linux platform you can simply use:
sleep(In seconds);

Upvotes: 0

4pie0
4pie0

Reputation: 29724

you can use boost::timer to calculate time in C++:

using boost::timer::cpu_timer;
using boost::timer::cpu_times;
using boost::timer::nanosecond_type;
...
nanosecond_type const three_seconds(3 * 1000000000LL);

cpu_timer timer;


  cpu_times const elapsed_times(timer.elapsed());
  nanosecond_type const elapsed(elapsed_times.system + elapsed_times.user);
  if (elapsed >= three_seconds)
  {
    //more then 3 seconds elapsed
  }

Upvotes: 1

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