diff --git a/src/vm.c b/src/vm.c
index 668aed7..531f342 100644
--- a/src/vm.c
+++ b/src/vm.c
@@ -1,4 +1,3 @@
-#include <errno.h>
 #include <stdbool.h>
 #include <stdint.h>
 #include <stdio.h>
@@ -24,7 +23,9 @@ typedef enum {
   OP_SUB_F32,       /* dest = src1 - src2  */
   OP_MUL_F32,       /* dest = src1 * src2  */
   OP_DIV_F32,       /* dest = src1 / src2  */
-  OP_MOV,           /* dest = src1	     */
+  OP_F32_TO_INT,    /* dest = src1 as int  */
+  OP_INT_TO_F32,    /* dest = src1 as f32  */
+  OP_MOV,           /* dest = src1	   */
   OP_JMP,           /* jump to address src1 unconditionally */
   OP_JGZ,           /* jump to address dest if src1 > 0 */
   OP_INT_TO_STRING, /* dest = src1 as str */
@@ -69,7 +70,7 @@ void pack_string(const char *str, uint32_t length, uint32_t dest_addr) {
   uint32_t i = 0;
   while (i < length) {
     char ch = str[i++];
-    if (ch == '\0' || ch == EOF) {
+    if (ch == '\0') {
       uint32_t word = memory[buffer_addr + word_index].u;
       word = set_char(word, char_index, '\0');
       memory[buffer_addr + word_index].u = word;
@@ -85,7 +86,6 @@ void pack_string(const char *str, uint32_t length, uint32_t dest_addr) {
       char_index = 0;
       word_index++;
     }
-    length++;
   }
 }
 
@@ -142,6 +142,16 @@ void run_vm() {
       }
       memory[dest_addr].f = memory[src1_addr].f / memory[src2_addr].f;
       break;
+    case OP_F32_TO_INT: {
+      float tmp = memory[src1_addr].f;
+      memory[dest_addr].u = (uint32_t)tmp;
+      break;
+    }
+    case OP_INT_TO_F32: {
+      int tmp = memory[src1_addr].u;
+      memory[dest_addr].f = (float)tmp;
+      break;
+    }
     case OP_HALT:
       return;
     case OP_MOV:
@@ -238,9 +248,13 @@ int main() {
   memory[i++].u = 100;
   memory[i++].u = OP_JGZ;
   memory[i++].u = 100;
-  memory[i++].u = 4;
-  memory[i++].u = 4;
-  memory[i++].u = OP_F32_TO_STRING;
+  memory[i++].u = 0;
+  memory[i++].u = 0;
+  memory[i++].u = OP_F32_TO_INT;
+  memory[i++].u = 103;
+  memory[i++].u = 0;
+  memory[i++].u = 103;
+  memory[i++].u = OP_INT_TO_STRING;
   memory[i++].u = 103;
   memory[i++].u = 0;
   memory[i++].u = 104;