Clock()

This is a discussion on Clock() within the C Programming forums, part of the General Programming Boards category; The value the clock() function returns is a clock_t type, fine, BUT that value is in Hertzios or in what?? ...

  1. #1
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    Clock()

    The value the clock() function returns is a clock_t type, fine, BUT that value is in Hertzios or in what??

    Clock returns the number of system clock signals that occured since the start of the program, but I dont know if that means MHerzs or miliseconds used by the processor or what.
    ---Programming is like roaming, you never know where you'll end at------

    If 'here' is pronounced as 'hear', why 'there' isnt pronounced as 'dear'??

    paninaro3000@yahoo.com

  2. #2
    Registered User C_Coder's Avatar
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    clock returns the number of clock ticks since the beginning of your program, to work out how long this was you need to use the CLOCKS_PER_SEC macro.
    Code:
    #include <stdio.h>
    #include <time.h>
    
    int main( void )
    {
    	clock_t start, stop;
    	long int x;
    	double duration;
    
    	start = clock();  // get number of ticks before loop
    
    	for( x = 0; x < 1000000; x++ );
    
    	stop = clock();  // get number of ticks after loop
    
    	// calculate time taken for loop
    	duration = ( double ) ( stop - start ) / CLOCKS_PER_SEC;
    
    	printf( "\nThe number of seconds for loop to run was %.2lf\n", duration );
    
    	return 0;
    }
    All spelling mistakes, syntatical errors and stupid comments are intentional.

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    Not ansered

    And what is a clock tick?? Because in my program i use that function and it returns 3450 in 3 seconds and i really dont think that 3450 are seconds, so what unit is that?? a megahertz??

    That was my question in the first place.
    ---Programming is like roaming, you never know where you'll end at------

    If 'here' is pronounced as 'hear', why 'there' isnt pronounced as 'dear'??

    paninaro3000@yahoo.com

  4. #4
    Registered User TravisS's Avatar
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    Look closely at it, what does it look like? How could 3450 and 3 be related?

    3450/1000=3.45

    Get it? It is in 1/1000 seconds

  5. #5
    Im back! shaik786's Avatar
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    It means, there were 3450 ticks in the clock to process what ever was in between the calls to the two clock()'s of your program.

    See the definition of CLOCKS_PER_SEC in the header file time.h

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