diff --git a/fractions.hpp b/fractions.hpp
index e830627..6e11858 100644
--- a/fractions.hpp
+++ b/fractions.hpp
@@ -23,7 +23,7 @@ private:
     s.erase(i + 1, s.length());
     bool point = false;
     int count = 0;
-    for (int i = 0; i < s.length(); i++) {
+    for (long unsigned i = 0; i < s.length(); i++) {
       if (s[i] == '.') {
         point = true;
       } else {
@@ -69,10 +69,11 @@ public:
     n = q.n;
     d = q.d;
   }
+  ~fraction() {}
   // Member functions
   int get_sign() const { return (!(n >= 0) != !(d >= 0)) ? -1 : 1; }
-  signed long long get_n() const { return n; }
-  signed long long get_d() const { return d; }
+  signed long long get_n() const { return this->n; }
+  signed long long get_d() const { return this->d; }
   double to_double() const {
     double dec = (double)n / (double)d;
     return dec;
@@ -132,17 +133,17 @@ public:
     return os;
   }
   void operator=(const fraction &q) {
-    n = q.n;
-    d = q.d;
+    this->n = q.n;
+    this->d = q.d;
   }
   void operator=(const int i) {
-    n = (signed long long)i;
-    d = (signed long long)1;
+    this->n = (signed long long)i;
+    this->d = (signed long long)1;
   }
   void operator=(const double dec) {
     const fraction q(dec);
-    n = q.n;
-    d = q.d;
+    this->n = q.n;
+    this->d = q.d;
   }
   bool operator>(const fraction &q) const {
     signed long long hcf = gcd(d, q.d);
@@ -155,7 +156,7 @@ public:
     return (*this > q);
   }
   bool operator==(const fraction &q) const {
-    return ((n == q.n) && (d == q.d));
+    return ((this->n == q.n) && (this->d == q.d));
   }
   bool operator==(const int i) const {
     fraction q(i);