step-42: fix compilation error

git-svn-id: https://svn.dealii.org/trunk@25561 0785d39b-7218-0410-832d-ea1e28bc413d

diff --git a/deal.II/examples/step-42/step-42.cc b/deal.II/examples/step-42/step-42.cc
index 81038da2ddd26eede758fdc4a7152bb49662c9ab..5683e4af2abbfad0d941a1bbaf6063fdf6137daf 100644 (file)
--- a/deal.II/examples/step-42/step-42.cc
+++ b/deal.II/examples/step-42/step-42.cc
@@ -1177,7 +1177,7 @@ void Step4<dim>::solve_newton ()
       double a = 0;
       for (unsigned int i=0; (i<10)&&(!damped); i++)
        {
-         a=pow(0.5,i);
+         a=pow(0.5, static_cast<double>(i));
          old_solution = tmp_vector;
          old_solution.sadd(1-a,a, distributed_solution);