diff --git a/src/a64instruction.h b/src/a64instruction.h
index 31fc602..463e75a 100644
--- a/src/a64instruction.h
+++ b/src/a64instruction.h
@@ -1,3 +1,5 @@
+#ifndef __A64INSTRUCTION__
+#define __A64INSTRUCTION__
 #include "a64instruction_DPImmediate.h"
 #include "a64instruction_Branch.h"
 #include "a64instruction_SingleTransfer.h"
@@ -22,3 +24,5 @@ typedef struct {
         a64inst_SingleTransferData SingleTransferData;
     } data;
 } a64inst_instruction;
+
+#endif
diff --git a/src/decode.h b/src/decode.h
index a141a8f..09a1c55 100644
--- a/src/decode.h
+++ b/src/decode.h
@@ -69,5 +69,3 @@
 #define BRANCH_CONDITIONAL_COND_MSB 4
 #define BRANCH_CONDITIONAL_OFFSET_LSB 5
 #define BRANCH_CONDITIONAL_OFFSET_MSB 24
-
-a64inst_instruction *decode(word w);
\ No newline at end of file
diff --git a/src/emulate.c b/src/emulate.c
index 3bbb3d7..54b0d68 100755
--- a/src/emulate.c
+++ b/src/emulate.c
@@ -1,5 +1,12 @@
 #include <stdlib.h>
 #include <stdio.h>
+#include "emulator.h"
+#include "fileio.h"
+#include "print.h"
+#include "decode.h"
+#include "execute.h"
+
+extern a64inst_instruction *decode(word w);
 
 int main(int argc, char **argv) {
 
@@ -18,6 +25,28 @@ int main(int argc, char **argv) {
     }
   }
 
+  // Initialising the machine state
+  Machine *state = {0};
+  state->memory = fileio_loadBin(argv[1], MEMORY_SIZE);
+  state->conditionCodes = (PState){0, 1, 0, 0};
+  state->pc = 0x0;
   
+  // get
+  a64inst_instruction *inst;
   
+  do {
+    
+    word instruction = readWord(state, state->pc);
+    inst = decode(instruction);
+    execute(state, inst);
+
+    state->pc += 1;
+    
+  } while (inst->type != a64inst_HALT);
+
+  printState(state, out);
+  
+  free(state->memory);
+
+  return EXIT_SUCCESS;
 }
diff --git a/src/emulator.h b/src/emulator.h
index f6a3cb2..59942df 100644
--- a/src/emulator.h
+++ b/src/emulator.h
@@ -1,6 +1,7 @@
 #ifndef __EMULATOR__
 #define __EMULATOR__
 #include "global.h"
+#include <stdbool.h>
 
 /************************************
  * DEFINITIONS
@@ -23,7 +24,7 @@ typedef struct {
 typedef struct {
     word registers[REGISTER_COUNT];
     word pc;
-    byte memory[MEMORY_SIZE];
+    byte *memory;
     PState conditionCodes;
 } Machine;
 
diff --git a/src/execute.c b/src/execute.c
index e1ebbf9..d0c2c5e 100644
--- a/src/execute.c
+++ b/src/execute.c
@@ -1,18 +1,18 @@
 #include "execute.h"
 
-void execute(a64inst_instruction inst) {
+void execute(Machine *state, a64inst_instruction *inst) {
 
-    switch (inst.type) {
-        case a64inst_Halt:
+    switch (inst->type) {
+        case a64inst_HALT:
             // Halt the program
             break;
-        case a64inst_DPImmediate:
+        case a64inst_DPIMMEDIATE:
             // Execute a data processing immediate instruction
             break;
-        case a64inst_Branch:
+        case a64inst_BRANCH:
             // Execute a branch instruction
             break;
-        case a64inst_DPRegister:
+        case a64inst_DPREGISTER:
             // Execute a data processing register instruction
             break;
         default:
diff --git a/src/execute.h b/src/execute.h
index fd9da37..fcf39ec 100644
--- a/src/execute.h
+++ b/src/execute.h
@@ -1,3 +1,7 @@
+#ifndef __EXECUTE__
+#define __EXECUTE__
 #include "a64instruction.h"
+#include "emulator.h"
 
-void execute(a64inst_instruction inst);
\ No newline at end of file
+void execute(Machine *state, a64inst_instruction *inst);
+#endif