int main() is a standard main() prototype, and makes for cleaner examples

doc/examples/QuickStart_example.cpp

@@ -3,7 +3,7 @@
 
 using Eigen::MatrixXd;
 
-int main(int, char *[])
+int main()
 {
   MatrixXd m(2,2);
   m(0,0) = 3;

doc/examples/QuickStart_example2_dynamic.cpp

@@ -4,7 +4,7 @@
 using Eigen::MatrixXd;
 using Eigen::VectorXd;
 
-int main(int, char *[])
+int main()
 {
   MatrixXd m(3,3);
   for (int row = 0; row < 3; ++row)

doc/examples/QuickStart_example2_fixed.cpp

@@ -4,7 +4,7 @@
 using Eigen::Matrix3d;
 using Eigen::Vector3d;
 
-int main(int, char *[])
+int main()
 {
   Matrix3d m;
   for (int row = 0; row < 3; ++row)

doc/examples/Tutorial_PartialLU_solve.cpp

@@ -5,7 +5,7 @@
 using namespace std;
 using namespace Eigen;
 
-int main(int, char *[])
+int main()
 {
    Matrix3f A;
    Vector3f b;

doc/examples/Tutorial_simple_example_dynamic_size.cpp

@@ -3,7 +3,7 @@
 
 using namespace Eigen;
 
-int main(int, char *[])
+int main()
 {
   for (int size=1; size<=4; ++size)
   {

doc/examples/Tutorial_simple_example_fixed_size.cpp

@@ -3,7 +3,7 @@
 
 using namespace Eigen;
 
-int main(int, char *[])
+int main()
 {
   Matrix3f m3;
   m3 << 1, 2, 3, 4, 5, 6, 7, 8, 9;