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check.h

+#include <stdio.h>
+#include <math.h>
+
+void checkAccuracy(float *p, int nBodies)
+{
+  if (nBodies != 2<<11) return;
+
+  // Assuming N is set to 11, the x y and z coordinates of a particle
+  // (chosen at random) should
+  // equal the following values:
+
+  // -11.943975
+  // 3.198896
+  // 10.517184
+
+  int position1IsCorrect  = ( (int)(p[9*6]) ) == -11;
+  int position2IsCorrect  = ( (int)(p[(9*6) + 1] ) == 3);
+  int position3IsCorrect  = ( (int)(p[(9*6) + 2] ) == 10);
+  int positionsAreCorrect = (position1IsCorrect == 1) && (position2IsCorrect == 1) && (position3IsCorrect == 1);
+
+  printf("%s\n", positionsAreCorrect
+      ? "Simulator is calculating positions correctly."
+      : "Simulator is not calculating positions correctly.");
+
+  return;
+}