diff --git a/njvm.c b/njvm.c
index 95cf57c..7e9fd70 100644
--- a/njvm.c
+++ b/njvm.c
@@ -1,13 +1,33 @@
 #include <stdio.h>
 #include <string.h>
+#include <stdlib.h>
 #include "config.h"
 
+unsigned int stack[100];
+unsigned int current = 0;
+
+void stackPush(unsigned int value){
+    if(current > 100) {
+        fprintf(stderr, "stack overflow\n");
+        exit(EXIT_FAILURE);
+    }
+    stack[current] = value;
+    current++;
+}
+unsigned int stackPop(){
+    if(current < 1) {
+        fprintf(stderr, "stack underflow\n");
+        exit(EXIT_FAILURE);
+    }
+    return --current;
+}
+
 void version() {
     printf("Ninja Virtual Machine version %i (compiled %s, %s)\n", PROJECT_VERSION, __DATE__, __TIME__);
 }
 
 void help() {
-    printf("usage: ./njvm [option] [option] ...\n\t--version\tshow version and exit\n\t--help\t\tshow this help and exit");
+    printf("usage: ./njvm [option] [option] ...\n\t--version\tshow version and exit\n\t--help\t\tshow this help and exit\n");
 }
 void printArgs(int argc, char *argv[]){
     for (int i = 0; i < argc; ++i) {
@@ -34,8 +54,6 @@ int main(int argc, char *argv[]) {
 //    Started
         printf("Ninja Virtual Machine started\n");
 
-
-
 //    Stopped
         printf("Ninja Virtual Machine stopped\n");
         return 0;