The 10 seconds there is wall clock time the 4 seconds isn t.
Wall clock time c.
This digital clock will update the time automatically with an interval of 1 second in run time.
The clock function tells how much wall clock time has passed since the crt initialization during process start.
The value returned is expressed in clock ticks which are units of time of a constant but system specific length with a relation of clocks per sec clock ticks per second.
A clock consists of a starting point or epoch and a tick rate.
Note that this function does not strictly conform to iso c.
A program was running for 10 seconds and used 4 seconds of cpu time.
Wall time is thus different from cpu time which measures only the time during which the processor is actively working on a certain task.
Clocks time points durations clocks.
In other words it is the difference between the time at which a task finishes and the time at which the task started.
Call time function with argument 0 to store total seconds in total seconds variable.
The epoch used as reference by clock varies between systems but it is related to the program execution generally its launch.
In order to compute the processor time the difference between values returned by two different calls to clock one at the start and other at the end of the program is used.
For example a clock may have an epoch of january 1 1970 and tick every second.
Digital clock in c.
The clock function in c returns the approximate processor time that is consumed by the program.
If you stipulate any particular t1 then wall clock time is within the scope of iso c.
Returns the processor time consumed by the program.
Here we will see how to use the clock in c.
C defines several clock types.
Here we will find the elapsed time of a process using this clock function.
To get the elapsed time we can get the time using clock at the beginning and at the end of the taks then subtract the values to get the differences.
Mpj wall clock time usually refers to time intervals.
This clock is present in the time h or ctime header file.
To calculate the actual processing time of.
If the elapsed time is unavailable or has exceeded the maximum positive time that can be recorded as a clock t type the function returns the value clock t 1.
Elapsed real time real time wall clock time or wall time is the actual time taken from the start of a computer program to the end.
For example if the cpu is shared by other processes std clock time may advance slower than wall clock.
Std clock time may advance faster or slower than the wall clock depending on the execution resources given to the program by the operating system.
