并行计算.rar

#include<windows.h> #include<stdio.h> #include<time.h> #include<math.h> #define POINT_NUM 10000000//点的数目,尽量不适用N、M这些会出现命名冲突 #define THREAD_NUM 10 //线程数 DWORD Thread(int *pData) { double x, y; srand(time(NULL)); for(int i = 0; i < POINT_NUM / THREAD_NUM; i++) { x = (double)(1.0 * rand() / RAND_MAX); y = (double)(1.0 * rand() / RAND_MAX); if(pow(x, 2) + pow(y, 2) <= 1.0) (*pData) += 1; } return 0; } int main() { double pi; int count[THREAD_NUM]; int total=0; HANDLE h[THREAD_NUM]; for(int i=0;i<THREAD_NUM;i++) { count[i]=0; h[i] = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE) Thread, &count[i], 0, NULL); if(h[i] == NULL) printf("CreateThread Thread%d Error!\n",i); Sleep(1000); } WaitForMultipleObjects(THREAD_NUM,h,TRUE,INFINITE); for(int i = 0; i < THREAD_NUM; i++) { total+=(count[i]); } pi = 4.0 * total / POINT_NUM; printf("pi:%f\n",pi); return 0; }