Add week01

demos/week01/CMakeLists.txt

+cmake_minimum_required(VERSION 2.8)
+ 
+project(PT1_week01)
+
+# compile the programs from source
+add_executable(loop.exe loop.cpp)
+add_executable(swap.exe swapfixed.cpp)
+# add_executable(swap0.exe swap.cpp) # won t work because of swap3 ;-)
+add_executable(prepost.exe prepost.cpp)
+add_executable(hello.exe hello.cpp)
+

demos/week01/hello.cpp

+#include <iostream>
+
+int main() {
+
+  std::cout << sizeof("Hello") << std::endl;
+
+  return 0;
+
+}
+

demos/week01/loop.cpp

+#include <iostream>
+
+int main() {
+
+  std::cout << "Enter a number: ";
+  unsigned int n;  
+  std::cin >> n;
+
+  std::cout << "for loop\n";
+  for (int i=1;i<=n;++i)
+    std::cout << i << "\n";
+
+  std::cout << "while loop\n";
+  int i=0; 
+  while (i<n)  
+    std::cout << ++i << "\n";
+
+  std::cout << "do loop\n";
+  i=1;
+  do
+    std::cout << i++ << "\n";
+  while (i<=n);
+
+  std::cout << "endless loop\n";
+    
+  i=1;
+  while (true) {
+    if(i>n) break;
+    std::cout << i++ << "\n";
+  }
+
+  return 0;
+
+}
+

demos/week01/prepost.cpp

+#include <iostream>
+
+int main() {
+
+  int a = 0;
+  std::cout << a++;
+  std::cout << ++a;
+  std::cout << a;
+
+  std::cout << "\n";
+
+  return 0;
+
+}
+

demos/week01/swap.cpp

+#include <iostream>
+
+void swap1 (int a, int b) { int t=a; a=b; b=t; }
+void swap2 (int& a, int& b) { int t=a; a=b; b=t; }
+void swap3 (const int & a, const int& b) { int t=a; a=b; b=t; }
+void swap4 (int *a, int *b) { int *t=a; a=b; b=t; }
+void swap5 (int* a, int* b) { int t=*a; *a=*b; *b=t; }
+
+int main() {
+
+// Which will compile? What is the effect of:
+  { int a=1; int b=2; swap1(a,b); std::cout << a << " " << b << "\n"; }
+  { int a=1; int b=2; swap2(a,b); std::cout << a << " " << b << "\n"; } 
+  { int a=1; int b=2; swap3(a,b); std::cout << a << " " << b << "\n"; } 
+  { int a=1; int b=2; swap4(&a,&b); std::cout << a << " " << b << "\n"; } 
+  { int a=1; int b=2; swap5(&a,&b); std::cout << a << " " << b << "\n"; }
+
+  return 0;
+}
+

demos/week01/swapfixed.cpp

+#include <iostream>
+
+void swap1 (int a, int b) { int t=a; a=b; b=t; }
+void swap2 (int& a, int& b) { int t=a; a=b; b=t; }
+void swap4 (int *a, int *b) { int *t=a; a=b; b=t; }
+void swap5 (int* a, int* b) { int t=*a; *a=*b; *b=t; }
+
+int main() {
+
+// Which will compile? What is the effect of:
+  { int a=1; int b=2; swap1(a,b); std::cout << a << " " << b << "\n"; }
+  { int a=1; int b=2; swap2(a,b); std::cout << a << " " << b << "\n"; } 
+  { int a=1; int b=2; swap4(&a,&b); std::cout << a << " " << b << "\n"; } 
+  { int a=1; int b=2; swap5(&a,&b); std::cout << a << " " << b << "\n"; }
+
+  return 0;
+}
+