鼓 集 行 集
Sometimes, we need to quantify the execution time of a program, which can be done with the C function clock.
The prototype of the clock function is
Clock_t clock (void);
Its return value is the time using the CPU with the current process of Clock Tick. Returns -1 when this time cannot be obtained. A Clock Tick is a time unit that defines several clock ticks in a second. In VC , this number is defined as Clocks_Per_Sec. So Clock Tick / Clock_Per_Sec can derive the execution time in seconds.
The following code is a typical example of using a clock to calculate a program execution time.
Clock_t start, finish;
Double duration;
START = clock ();
// TODO requires measurement blocks
Finish = clock ();
DURATION = (Double) / clocks_per_sec;
