Finish Chapter 15

Implement a basic VM that is capable of simple math.

Signed-off-by: Daniel Henry <iamdanhenry@gmail.com>

src/main.c

@@ -1,16 +1,34 @@
 #include "chunk.h"
 #include "common.h"
 #include "debug.h"
+#include "vm.h"
 
 int main(int argc, const char *argv[]) {
+  initVM();
+
   Chunk chunk;
   initChunk(&chunk);
   int constant = addConstant(&chunk, 1.2);
   writeChunk(&chunk, OP_CONSTANT, 123);
   writeChunk(&chunk, constant, 123);
+
+  constant = addConstant(&chunk, 3.4);
+  writeChunk(&chunk, OP_CONSTANT, 123);
+  writeChunk(&chunk, constant, 123);
+
+  writeChunk(&chunk, OP_ADD, 123);
+
+  constant = addConstant(&chunk, 5.6);
+  writeChunk(&chunk, OP_CONSTANT, 123);
+  writeChunk(&chunk, constant, 123);
+
+  writeChunk(&chunk, OP_DIVIDE, 123);
+  writeChunk(&chunk, OP_NEGATE, 123);
   writeChunk(&chunk, OP_RETURN, 123);
 
   disassembleChunk(&chunk, "test chunk");
+  interpret(&chunk);
+  freeVM();
   freeChunk(&chunk);
   return 0;
 }