Clocking a program, and parts of it

**Boksha** · 03-17-2002

Hullo!
I'm quite unexperienced at C, and have a few questions.
First, I've written a program that calculates Pi in a simple (and rather idiotic) way, with different levels of optimisation, and I want to clock each method to see how much faster each is. How do I go about this? (C++ specific methods are just fine too)

I'm also a bit unsure about strings and arrays, but I'll first look up some tutorials and the such. (EDIT) Yes, I've another question: When I want to make a pointer that points to an array of 3 ints, and access it, would this be valid?:

unsigned int *Arrayptr;
Arrayptr=(unsigned int *)malloc(sizeof(int)*3);
*Arrayptr[0]=14278;
*Arrayptr[2]=*Arrayptr[0]*2;

(^fictional scenario)

Thanks for hearing me out.

**bljonk** · 03-17-2002

U should try using the <time.h> header file;

look at its function and macros.

**kdt** · 03-17-2002

you can use time() function to learn the calculation time
------------------------
#include <time.h>
#include <stdio.h>
void main()
{long first_time,second_time;
time(&first_time);
// your codes that calculate pi
time(&second_time);
printf("Calculation time is %ld seconds.",second_time-first_time);
}
------------------------
but it gives you the difference as seconds
if you need the calculation time in milliseconds you can study
ftime() function

**Boksha** · 03-18-2002

Alright! That was exactly what I needed. Thanks! I don't think I see the ftime() function anywhere though, but I can probably achieve the same result with the clock() function from the same header.
long Ticks;
Ticks=clock();

**kdt** · 03-18-2002

I'm sorry
I forgot to say ftime() function(in <sys\timeb.h>) is not a function of ANSI C.
for dos and unix

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Clocking a program, and pointers to arrays

#include <time.h>

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