C++ linker presentation

cpplinker/07_linker_errors/undefined_ref/main.cpp

@@ -0,0 +1,8 @@
+#include <iostream>
+
+int add(int, int);  // declared but never defined
+
+int main() {
+    std::cout << add(3, 4) << "\n";
+    return 0;
+}