寫一個程序,讓用戶來決定Windows任務管理器(Task Manager)的CPU佔有率,程序越精簡越好,計算機語言不限。例如,能夠實現下面三種狀況:
#CPU的佔用率固定在50%,爲一條直線。
#CPU的佔用率爲一條直線,可是具體佔用率由命令行參數決定(參數範圍1~100)。
#CPU的佔用率狀態是一個正弦曲線,摘自《編程之美》。
#include "Windows.h"
#include "stdlib.h"
#include "math.h"
const double SPLIT = 0.01
;
const int COUNT = 200
;
const double PI = 3.14159265
;
const int INTERVAL = 300
;
int _tmain(int argc, _TCHAR*
argv[])
{
DWORD busySpan[COUNT]; //array of busy times
DWORD idleSpan[COUNT]; //array of idle times
int half = INTERVAL / 2
;
double radian = 0.0
;
for(int i = 0; i < COUNT; i++
)
{
busySpan[i] = (DWORD)(half + (sin(PI * radian) *
half));
idleSpan[i] = INTERVAL -
busySpan[i];
radian +=
SPLIT;
}
DWORD startTime = 0
;
int j = 0
;
while (true
)
{
j = j %
COUNT;
startTime =
GetTickCount();
while ((GetTickCount() - startTime) <=
busySpan[j]) ;
Sleep(idleSpan[j]);
j++
;
}
return 0
;
}