C++ get time in milliseconds

[Saurabh]

Hi ,

i am working with g++ on Linux.is there a way in C++ to get current
time in milliseconds.( <ctime> provides accuracy upto seconds).
I googled for it,searched the newsgroup but couldnt find anything.
i hope i will get the help
thanks & regards
Saurabh

 

[Mehturt]

Hi ,

i am working with g++ on Linux.is there a way in C++ to get current
time in milliseconds.( <ctime> provides accuracy upto seconds).
I googled for it,searched the newsgroup but couldnt find anything.
i hope i will get the help
thanks & regards
Saurabh

gettimeofday()

 

[wallaby.curious.about.it]

Hi ,

i am working with g++ on Linux.is there a way in C++ to get current
time in milliseconds.( <ctime> provides accuracy upto seconds).
I googled for it,searched the newsgroup but couldnt find anything.
i hope i will get the help
thanks & regards
Saurabh

Hi,

You can use clock_t from standard library to measure short intervalls
of time. from a millisec to some seconds. You can convert it to seconds
with CLOCKS_PER_SEC macro.
example:
#include<ctime>
#include<time.h> // I don't know which1 exactly
clock_t t1=clock();
for(int i=0; i<1000000;i++);
clock_t t2=clock();
cout<<"Iterations took for" << doubel(t2-t1)/CLOCK_PER_SEC << "seconds";

 

[Markus Schoder]

Hi,

You can use clock_t from standard library to measure short intervalls
of time. from a millisec to some seconds. You can convert it to seconds
with CLOCKS_PER_SEC macro.
example:
#include<ctime>
#include<time.h> // I don't know which1 exactly
clock_t t1=clock();
for(int i=0; i<1000000;i++);
clock_t t2=clock();
cout<<"Iterations took for" << doubel(t2-t1)/CLOCK_PER_SEC << "seconds";

clock() measures processor time however.

 

[rexonf]

ftime

 

[Jonathan Mcdougall]

Hi ,

i am working with g++ on Linux.is there a way in C++ to get current
time in milliseconds.( <ctime> provides accuracy upto seconds).
I googled for it,searched the newsgroup but couldnt find anything.

You did? Searching for "time millisecond" in comp.lang.c++ gives some
pretty good results.

Time and date features are found in <ctime>. However, what the accuracy
of time() is implementation defined. Implementations are not even
required to provide a working time() function.

That <ctime> "provides accuracy up to seconds" is wrong, I think. POSIX
requires CLOCKS_PER_SEC to be 1,000,000 (microseconds) and Windows has
1000 (millisecond, on Visual C++ 2005).

You may be better served by platform specific features if you require
more precise timing. See
http://www.parashift.com/c++-faq-lite/how-to-post.html#faq-5.9 for
newsgroup suggestions.


Jonathan

 

[osmium]

Saurabh wrote:

You did? Searching for "time millisecond" in comp.lang.c++ gives some
pretty good results.

Google and Google groups are two entirely different worlds. Which I, and I
suspect a lot of seasoned users, forget from time to time.

 

[Jonathan Mcdougall]

Google and Google groups are two entirely different worlds.

They index different things but they are "search engines", as far as I
know. Search thoroughly or don't search at all.

I rarely suggest posters to STFW, but I do rant a bit when I see "I did
searched for it, but couldn't find anything".

Which I, and I
suspect a lot of seasoned users, forget from time to time.

Does that apply to me? The OP specifically said "I googled for it,
searched the newsgroup but couldn't find anything".


Jonathan