#include <stdio.h>

 #include <stdlib.h>

 #include <omp.h>   

 const int thread = ;

 void hello(void)

 {

 #   ifdef _OPENMP   // 检查是否支持 OpemMP，其值为发布年月

     const int rank = omp_get_thread_num(), size = omp_get_num_threads();

     printf("Hello from thread %d of %d\n", rank, size);

 #   else

     printf("Not support for OpenMP, use one thread.\n");

 #   endif

 }

 int main(int argc, char* argv[])

 {

     int threadReal = thread;

     if (argc >  && *argv[] > ''&& *argv[] < '')

         threadReal = atoi(argv[]);

 #   pragma omp parallel num_threads(threadReal)// 使用指定的线程数扩展接下来的一条语句

     hello();

     printf("\nfinish.\n");

     getchar();

     return ;

 }

Hello from thread   of

Hello from thread   of

Hello from thread   of

Hello from thread   of

Hello from thread   of

Hello from thread   of

Hello from thread   of

Hello from thread   of  

finish.