diff --git a/src/main.rs b/src/main.rs
index dfdbc9d..f677c94 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,10 +1,11 @@
 use std::fs;
 use std::env;
 use std::fmt;
+use std::usize;
 
 struct Program {
     data: Vec<String>,
-    pc: u32
+    pc: usize
 }
 
 impl Program {
@@ -22,8 +23,15 @@ impl Program {
         return Program{ data: op_list, pc: 0 };
     }
 
-    fn run(&self) {
+    fn run(&mut self) {
         println!("{}", self);
+        while self.pc < self.data.len() {
+            println!("PC is {}", self.pc);
+            let opcode = &self.data[self.pc];
+
+
+            self.pc = self.pc + 1;
+        }
     }
 }
 
@@ -43,6 +51,6 @@ fn main() {
     let filename = &args[1];
 
     let contents = fs::read_to_string(filename).expect("Something went wrong reading the file");
-    let prog = Program::from_string(contents);
+    let mut prog = Program::from_string(contents);
     prog.run();
 }