diff --git a/vector.hpp b/vector.hpp
index f833cab..5cd099c 100644
--- a/vector.hpp
+++ b/vector.hpp
@@ -4,20 +4,27 @@
 using namespace std;
 class vector {
 private:
-  long long dimention;
-  cnumber *entries;
+  long long dimention = 0;
+  cnumber *entries = NULL;
+  bool err = true;
 
 public:
+  bool is_error() { return this->err; }
+  vector() {};
   vector(const long long dimention) {
+    this->err = false;
     this->dimention = dimention;
-    this->entries = (cnumber *)calloc(sizeof(cnumber), dimention);
+    free(this->entries);
+    this->entries = (cnumber *)malloc(sizeof(cnumber)* dimention);
     for (long long i = 0; i < dimention; i++) {
       this->set_entry(i, cnumber(0, 0));
     }
   }
   vector(const vector &v) {
+    this->err = false;
     this->dimention = v.get_dimention();
-    this->entries = (cnumber *)calloc(sizeof(cnumber), v.get_dimention());
+    free(this->entries);
+    this->entries = (cnumber *)malloc(sizeof(cnumber)* v.get_dimention());
     for (long long i = 0; i < v.get_dimention(); i++) {
       this->set_entry(i, v.get_entry(i));
     }
@@ -59,10 +66,11 @@ public:
   void operator=(const vector &v) {
     this->dimention = v.get_dimention();
     free(this->entries);
-    this->entries = (cnumber *)calloc(sizeof(cnumber), dimention);
+    this->entries = (cnumber *)malloc(sizeof(cnumber)* dimention);
     for (long long i = 0; i < v.get_dimention(); i++) {
       this->set_entry(i, v.get_entry(i));
     }
+    this->err = false;
   }
   const vector operator+(const vector &v) const {
     if (this->get_dimention() != v.get_dimention()) {