adding instructions to manually include libresolv if needed

Author: Ian Eyberg

cpp/01-hello-world/README.md

@@ -0,0 +1,14 @@
+C++ Hello World
+================
+
+Compile C++ code:
+
+```sh
+gcc main.cpp -lstdc++ -o app.exe
+```
+
+Run with ops:
+
+```sh
+ops run app.exe
+```

cpp/main.cpp renamed to cpp/01-hello-world/main.cpp

@@ -0,0 +1,30 @@
+C++ Hello World
+================
+
+Depending on your libc version and your distro of choice you'll want to
+include libresolv (you might not have to do this on newer versions):
+
+```sh
+cc main.cpp -o main
+```
+
+config.json:
+```sh
+{
+        "Files": ["/usr/lib/x86_64-linux-gnu/libresolv.so.2"]
+}
+```
+
+If you're unsure you can do a
+
+```
+ops run --trace main &>/tmp/out
+```
+
+and grep for library load failures. Most OPS packages auto-include this
+for interpreted languages and other newer compiled languages deal with
+this differently.
+
+```
+ops run -c config.json main
+```

cpp/02-dns/README.md

@@ -0,0 +1,28 @@
+#include <sys/types.h>
+#include <stdlib.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <netdb.h>
+#include <stdio.h>
+
+int main(int argc, char *argv[])
+{
+
+  struct hostent *hp;
+  struct in_addr ip_addr;
+
+  const  char *host = "dns.google";
+
+  hp = gethostbyname(host);
+  if (!hp) {
+    printf("was not resolved\n");
+  }
+
+  ip_addr = *(struct in_addr *)(hp->h_addr);
+  printf("Hostname: dns.google, was resolved to: %s\n",
+  inet_ntoa(ip_addr));
+
+  exit(EXIT_SUCCESS);
+
+}

cpp/02-dns/main.cpp

@@ -1,14 +1,2 @@
 C++ Hello World
 ================
-
-Compile C++ code:
-
-```sh
-gcc main.cpp -lstdc++ -o app.exe
-```
-
-Run with ops:
-
-```sh
-ops run app.exe
-```