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     The clock function tells how much processor time has been used by
     the calling process. The time in seconds is approximated by
     dividing the clock return value by the value of the CLOCKS_PER_SEC
     constant.
 
     In other words, the clock function returns the number of processor
     timer ticks that have elapsed. A timer tick is approximately equal
     to 1/CLOCKS_PER_SEC seconds.
 
     In both DOS and OS/2, the clock function returns the time elapsed
     since the process started. This may not be equal to the actual
     processor time used by the process.
 
     In previous versions of Microsoft C, the CLOCKS_PER_SEC constant
     was called CLK_TCK.
 
     Return Value
 
     The clock function returns the product of the time in seconds and
     the value of the CLOCKS_PER_SEC constant. If the processor time is
     not available, the function returns the value -1, cast as clock_t.
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