Measuring time of a reply

**Zewu** · 10-27-2003

I would like to know if there is a way in C++ to measure the time that it takes between a function is initiated and a value is returned from it.

Example:

Code:

std::cout << "assign a value: ";
std::cin >> variable:

(Here I call "std::cin" a function.)

Here I want to know the time that it takes from that that the program is expecting a value to be assigned to the variable "variable", and that that a value has been assigned to it.

I would also like to have the time that has been measured returned in a float of seconds and hundreds of seconds, like 3.21 for example.

Sorry if I don't know the correct terms for everything, I hope you understand what I mean anyway.

**EvBladeRunnervE** · 10-27-2003

well, you could use GetTickCount() like so:

Code:

float current,last;

last = GetTickCount(); /* get the current ticks since system   
                                          startup
                                         measured in milliseconds*/

// your function

current = (GetTickCount - last)/1000;// take the time elapsed     between the two, and divide by 
                                                        1 thousand to get time in seconds.*/
printf("Function took %f seconds\n",current);

**JaWiB** · 10-27-2003

Except this is the C++ board so you would use cout...

And you forgot the parentheses on your second call to GetTickCount()

**Zewu** · 10-27-2003

You think I'm a noob, but I actually found that with the missing paranthesis out by myself. Yes, it's some float variable named "last", which I can't really figure out what its purpose is, subtracted from the return value of GetTickCount(). Right?

I actually got this to work!!! The code does what I wanted it to do, I'm very thankful for this =)))

**Fordy** · 10-27-2003

>>current = (GetTickCount - last)/1000;

If that will compile at all, it's taking the address of the function...not calling it and manipulating the result

GetTickCount isnt that reliable anyway...If you want any decent, consistant results, use a profiler

**Zewu** · 10-27-2003

Then what it is a profiler and how does it work?

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