diff --git a/Demo.cpp b/Demo.cpp
index de960de..4465c4f 100644
--- a/Demo.cpp
+++ b/Demo.cpp
@@ -3,7 +3,7 @@
  *
  * @author Evgeny Hershkovitch Neiterman
  * @since 2023-03
- */
+ */   
 
 #include <iostream>
 #include <fstream>
@@ -29,7 +29,7 @@ int main() {
     cout << c++ << endl;
     cout << --c << endl;
 
-    cout << "c >=b ? : " << c >= b << endl;
+    cout << "c >=b ? : " << (c >= b) << endl;
     if (a > 1.1) cout << " a is bigger than 1.1" << endl;
     else cout << " a is smaller than 1.1" << endl;
 
diff --git a/Test.cpp b/Test.cpp
new file mode 100644
index 0000000..b4cea61
--- /dev/null
+++ b/Test.cpp
@@ -0,0 +1,78 @@
+#include <iostream>
+#include <fstream>
+#include <sstream>
+#include <stdexcept>
+using namespace std;
+
+#include "doctest.h"
+#include "sources/Fraction.hpp"
+using namespace ariel;
+TEST_CASE("Correct Init"){
+    Fraction a(5,3);
+    CHECK(a.getNumerator() == 5);
+    CHECK(a.getDenominator() == 3);
+}
+TEST_CASE("Correct Init with negative"){
+    Fraction a(-5,3);
+    CHECK(a.getNumerator() == -5);
+    CHECK(a.getDenominator() == 3);
+}
+TEST_CASE("Correct Reduce"){
+    Fraction a(10,5);
+    CHECK(a.getNumerator() == 2);
+    CHECK(a.getDenominator() == 1);
+}
+TEST_CASE("Denominator can't be 0"){
+    CHECK_THROWS(Fraction(5,0));
+}
+TEST_CASE("Increment"){
+    Fraction a(5,3);
+    a++;
+    CHECK(a.getNumerator() == 8);
+    CHECK(a.getDenominator() == 3);
+}
+TEST_CASE("Decrement"){
+    Fraction a(5,3);
+    a--;
+    CHECK(a.getNumerator() == 2);
+    CHECK(a.getDenominator() == 3);
+}
+TEST_CASE("Addition"){
+    Fraction a(5,3);
+    Fraction b(14,21);
+    Fraction c = a+b;
+    CHECK(c.getNumerator() == 7);
+    CHECK(c.getDenominator() == 3);
+}
+TEST_CASE("Addition with float"){
+    Fraction a(5,3);
+    Fraction c = a + (float)2.5;
+    CHECK(c.getNumerator() == 25);
+    CHECK(c.getDenominator() == 6);
+}
+TEST_CASE("Subtraction"){
+    Fraction a(5,3);
+    Fraction b(1, 7);
+    Fraction c = a-b;
+    CHECK(c.getNumerator() == 32);
+    CHECK(c.getDenominator() == 21);
+}
+TEST_CASE("Subtraction with float"){
+    Fraction a(5,3);
+    Fraction c = a - (float)0.45;
+    CHECK(c.getNumerator() == 73);
+    CHECK(c.getDenominator() == 60);
+}
+TEST_CASE("Multiplication"){
+    Fraction a(5,3);
+    Fraction b(1, 7);
+    Fraction c = a*b;
+    CHECK(c.getNumerator() == 5);
+    CHECK(c.getDenominator() == 21);
+}
+TEST_CASE("Multiplication with float"){
+    Fraction a(5,3);
+    Fraction c = 0.45 * a;
+    CHECK(c.getNumerator() == 3);
+    CHECK(c.getDenominator() == 4);
+}
\ No newline at end of file
diff --git a/sources/Fraction.cpp b/sources/Fraction.cpp
new file mode 100644
index 0000000..60b55e2
--- /dev/null
+++ b/sources/Fraction.cpp
@@ -0,0 +1,125 @@
+#include "Fraction.hpp"
+#include <iostream>
+#include <fstream>
+#include <sstream>
+#include <stdexcept>
+using namespace std;
+namespace ariel{
+    int Fraction::gcd(int first, int second){
+        if (second == 0)
+            return first;
+        return gcd(second, first % second);
+    }
+    Fraction Fraction::operator+(const Fraction& other){
+        int newNumerator = this->numerator * other.denominator + other.numerator * this->denominator;
+        int newDenominator = this->denominator * other.denominator;
+        int gcd = this->gcd(newNumerator, newDenominator);
+        return Fraction(newNumerator/gcd, newDenominator/gcd);
+    }
+    Fraction Fraction::operator+(double num){
+        int newNumerator = this->numerator + num * this->denominator;
+        int newDenominator = this->denominator;
+        int gcd = this->gcd(newNumerator, newDenominator);
+        return Fraction(newNumerator/gcd, newDenominator/gcd);
+    }
+    Fraction Fraction::operator-(const Fraction& other){
+        int newNumerator = this->numerator * other.denominator - other.numerator * this->denominator;
+        int newDenominator = this->denominator * other.denominator;
+        int gcd = this->gcd(newNumerator, newDenominator);
+        return Fraction(newNumerator/gcd, newDenominator/gcd);
+    }
+    Fraction Fraction::operator-(double num){
+        int newNumerator = this->numerator - num * this->denominator;
+        int newDenominator = this->denominator;
+        int gcd = this->gcd(newNumerator, newDenominator);
+        return Fraction(newNumerator/gcd, newDenominator/gcd);
+    }
+    Fraction Fraction::operator*(const Fraction& other){
+        int newNumerator = this->numerator * other.numerator;
+        int newDenominator = this->denominator * other.denominator;
+        int gcd = this->gcd(newNumerator, newDenominator);
+        return Fraction(newNumerator/gcd, newDenominator/gcd);
+    }
+    Fraction operator*(double num, const Fraction& other){
+        // int newNumerator = this->numerator * num;
+        // int newDenominator = this->denominator;
+        // int gcd = this->gcd(newNumerator, newDenominator);
+        // return Fraction(newNumerator/gcd, newDenominator/gcd);
+
+        return other;
+    }
+    Fraction Fraction::operator/(const Fraction& other){
+        // int newNumerator = this->numerator * other.denominator;
+        // int newDenominator = this->denominator * other.numerator;
+        // int gcd = this->gcd(newNumerator, newDenominator);
+        // return Fraction(newNumerator/gcd, newDenominator/gcd);
+        return *this;
+    }
+    Fraction Fraction::operator/(double num){
+        int newNumerator = this->numerator;
+        int newDenominator = this->denominator * num;
+        int gcd = this->gcd(newNumerator, newDenominator);
+        return Fraction(newNumerator/gcd, newDenominator/gcd);
+    }
+    bool Fraction::operator==(const Fraction& other){
+        return (this->numerator == other.numerator && this->denominator == other.denominator);
+    }
+    bool Fraction::operator==(double num){
+        return (this->numerator == num * this->denominator);
+    }
+    bool Fraction::operator>(const Fraction& other){
+        return (this->numerator * other.denominator > other.numerator * this->denominator);
+    }
+    bool Fraction::operator>(double num){
+        return (this->numerator > num * this->denominator);
+    }
+    bool Fraction::operator<(const Fraction& other){
+        return (this->numerator * other.denominator < other.numerator * this->denominator);
+    }
+    bool Fraction::operator<(double num){
+        return (this->numerator < num * this->denominator);
+    }
+    bool Fraction::operator>=(const Fraction& other) const{
+        // return (this->numerator * other.denominator >= other.numerator * this->denominator);
+        return true;
+    }
+    bool Fraction::operator>=(double num){
+        // return (this->numerator >= num * this->denominator);
+        return true;
+    }
+    bool Fraction::operator<=(const Fraction& other){
+        // return (this->numerator * other.denominator <= other.numerator * this->denominator);
+        return true;
+    }
+    bool Fraction::operator<=(double num){
+        // return (this->numerator <= num * this->denominator);
+        return true;
+    }
+    Fraction Fraction::operator++(int){
+        Fraction temp = *this;
+        this->numerator += this->denominator;
+        return temp;
+    }
+    Fraction& Fraction::operator++(){
+        this->numerator += this->denominator;
+        return *this;
+    }
+    Fraction Fraction::operator--(int){
+        Fraction temp = *this;
+        this->numerator -= this->denominator;
+        return temp;
+    }
+    Fraction& Fraction::operator--(){
+        this->numerator -= this->denominator;
+        return *this;
+    }
+    std::ostream& operator<<(std::ostream& os, const Fraction& other){
+        // os << other.numerator << "/" << other.denominator;
+        return os;
+    }
+    std::istream& operator>>(std::istream& is, Fraction& other){
+        // char c;
+        // is >> other.numerator >> c >> other.denominator;
+        return is;
+    }
+}
\ No newline at end of file
diff --git a/sources/Fraction.hpp b/sources/Fraction.hpp
new file mode 100644
index 0000000..4edefaa
--- /dev/null
+++ b/sources/Fraction.hpp
@@ -0,0 +1,62 @@
+#include <iostream>
+#include <fstream>
+#include <sstream>
+#include <stdexcept>
+#pragma once
+using namespace std;
+namespace ariel{
+
+
+    class Fraction{
+    private:
+        int numerator;
+        int denominator;
+    public:
+        int gcd(int first, int second);
+        Fraction(int _numerator, const int _denominator): numerator(_numerator), denominator(_denominator){
+            if(_denominator == 0){
+                throw std::invalid_argument("Math: can't devide by 0");
+            }
+        }
+        Fraction operator+(const Fraction& other);
+        Fraction operator+(double num);
+        Fraction operator-(const Fraction& other);
+        Fraction operator-(double num);
+        Fraction operator*(const Fraction& other);
+        friend Fraction operator*(double num, const Fraction& other);
+        Fraction operator/(const Fraction& other);
+        Fraction operator/(double num);
+
+        bool operator==(const Fraction& other);
+        bool operator==(double num);
+        bool operator>(const Fraction& other);
+        bool operator>(double num);
+        bool operator<(const Fraction& other);
+        bool operator<(double num);
+        bool operator>=(const Fraction& other) const;
+        bool operator>=(double num);
+        bool operator<=(const Fraction& other);
+        bool operator<=(double num);
+
+        Fraction operator++(int); // postfix
+        Fraction operator--(int); // postfix
+        Fraction &operator++(); // prefix
+        Fraction &operator--(); // prefix
+
+        friend std::ostream& operator<<(std::ostream& ost, const Fraction& frc);
+        friend std::istream& operator>>(std::istream& ist, Fraction& frc);
+
+        int getNumerator() const
+        {
+            return this->numerator;
+        }
+        int getDenominator() const{
+            return this->denominator;
+        }
+    };
+
+
+
+
+
+}
\ No newline at end of file