Added programs

compiling_error.txt

@@ -0,0 +1,4 @@
+/home/erik/Documents/cpp/test.cpp: In function ‘double g(double (*)())’:
+/home/erik/Documents/cpp/test.cpp:15:11: error: invalid operands of types ‘int’ and ‘double (*)()’ to binary ‘operator*’
+   return 2*f;
+          ~^~

function_as_argument.cpp

@@ -0,0 +1,11 @@
+double Gaussian_Legendre(double a,double b,int n, function<double(double)> f){
+  double *x = new double[n];
+  double *w = new double[n];
+
+  gauleg(a,b,x,w,n);
+  double integral = 0;
+  for (int i=0; i<n;i++){
+    integral += w[i]*f(x[i]);
+      }
+  return integral;
+} 

test.cpp

@@ -1,25 +1,21 @@
-#include <iostream>
-#include <string>
-#include <vector>
-#include <cmath>
-#include <cctype>
-#include <array>
-#include <cstdlib>
-#include <cstdio>
-using namespace std;
-
-
-int func(int, int);
-
-int main()
-{
-
-  int a = 1, b = 2;
-  cout << func(a, b);
-  return 0;
-}
-
-int func(int a, int b)
-{
-  return a + b;
-}
+#include <iostream>
+
+using namespace std;
+
+double g(double f());
+double f(double x);
+
+int main()
+{
+  return 0;
+}
+
+double g(double f())
+{
+  return 2*f;
+}
+
+double f(double x)
+{
+  return 2*x;
+}

test.h

@@ -0,0 +1,5 @@
+
+double* returnarray(double* b)
+{
+  return b;
+}

test2.cpp

@@ -0,0 +1,19 @@
+#include <iostream>
+#include <cmath>
+
+using namespace std;
+
+double func(double x);
+
+int main()
+{
+
+  return 0;
+}
+
+double func(double x)
+{
+  double value;
+  value = 4/(1.+x*x);
+  return value;
+} // end of function to evaluate

testMPI.cpp

@@ -0,0 +1,24 @@
+#include <iostream>
+#include <omp.h>
+#define CHUNKSIZE 100
+#define N 10
+
+using namespace std;
+
+int main (int argc, char *argv[])
+{
+int i, chunk;
+float a[N], b[N], c[N];
+for (i=0; i < N; i++) a[i] = b[i] = i * 1.0;
+chunk = CHUNKSIZE;
+#pragma omp parallel shared(a,b,c,chunk) private(i)
+{
+#pragma omp for schedule(dynamic,chunk)
+for (i=0; i < N; i++) c[i] = a[i] + b[i];
+} /* end of parallel region */
+
+for (int j = 0; j != N; ++j) {
+  cout << c[i] << endl;
+}
+
+}

tuple.cpp

@@ -0,0 +1,12 @@
+#include <iostream>
+#include <tuple>
+
+using namespace std;
+
+int main()
+{
+  double a = 0, b = 2, c = 3, d = 5;
+  auto args = make_tuple (a, b, c ,d);
+  cout << get<1>(args);
+  return 0;
+}