C Reference function clock()
Usage of clock():
clock_t clock ( void );
Parameters:
None.
Return Value:
The number of clock ticks elapsed since the program start. If the function fails then it will return a value of -1. The clock_t type is defined in ctime.h.
Explanation:
The function returns the number of clock ticks elapsed since the start of the program.
The macro constant expression CLOCKS_PER_SEC specifies the relation between a clock tick and a second (clock ticks per second).
Note:The initial moment of reference used by clock as the beginning of the program on different platforms.
Source code example of clock():
#include <stdio.h>
#include <time.h>
void sec_wait ( int sec ) {
clock_t wait_till_end;
wait_till_end = clock () + sec * CLOCKS_PER_SEC ;
while (clock() < wait_till_end) {}
}
int main () {
int i;
printf ("Starting countdown...\n");
for (i=10; i>0; i--) {
printf ("%d\n",i);
sec_wait (1);
if ( i == 3 )
printf ("Engine started...\n");
}
printf ("and lift off....\n");
return 0;
}
Output example of the program above:
Starting countdown...
10
9
8
7
6
5
4
3
Engine started...
2
1
And lift off....
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The clock() code example has stuff to the right of the ‘while’ (underlined below):
while (clock() < wait_till_end) {} } int main
————————-
{
}
I like your site.
– George
@ George H: Nice catch, yes it was a formatting error. Changed the source code example and now the website is displaying the right format. Thx!