Update

openmp/test.cpp

+#include <omp.h>
+#include <iostream>
+
+int main()
+{
+  int nthreads;
+#pragma omp parallel
+#pragma omp master
+  nthreads = omp_get_num_threads();
+  
+  std::cout << "Number of threads for the next parallel region: "
+            << nthreads << std::endl;
+  return 0;
+}