diff --git a/meson.build b/meson.build
index 6fcaab6..197a617 100644
--- a/meson.build
+++ b/meson.build
@@ -19,3 +19,5 @@ c_2_lab_1_arg = executable(
 c_2_lab_2 = executable('c_2_lab_2', 'src/chapter_2/lab_2/main.cpp', install: true)
 c_2_lab_3 = executable('c_2_lab_3', 'src/chapter_2/lab_3/main.cpp', install: true)
 c_2_program_1 = executable('c_2_program_1', 'src/chapter_2/program_1/main.cpp', install: true)
+
+c_3_lab_1 = executable('c_3_lab_1', 'src/chapter_3/lab_1/main.cpp', install: true)
diff --git a/src/chapter_3/lab_1/main.cpp b/src/chapter_3/lab_1/main.cpp
new file mode 100644
index 0000000..7ea24ce
--- /dev/null
+++ b/src/chapter_3/lab_1/main.cpp
@@ -0,0 +1,172 @@
+#include <iostream>
+
+using namespace std;
+
+// Rational Class declaration
+class Rational {
+private:
+  int numerator;
+  int denominator;
+
+public:
+  Rational(int numerator = 0, int denominator = 1);
+  Rational add(const Rational &) const;
+  Rational subtract(const Rational &) const;
+  Rational multiply(const Rational &) const;
+  Rational divide(const Rational &) const;
+  void simplify();
+  void display() const;
+
+private:
+  int gcd(int, int) const;
+};
+
+// Implement Rational class member functions here
+Rational::Rational(int numerator, int denominator) {
+  this->numerator = numerator;
+  this->denominator = denominator;
+}
+
+Rational Rational::add(const Rational &frac) const {
+  return Rational(this->numerator * frac.denominator +
+                      frac.numerator * this->denominator,
+                  this->denominator * frac.denominator);
+}
+
+Rational Rational::subtract(const Rational &frac) const {
+  return Rational(this->numerator * frac.denominator -
+                      frac.numerator * this->denominator,
+                  this->denominator * frac.denominator);
+}
+
+Rational Rational::multiply(const Rational &frac) const {
+  return Rational(this->numerator * frac.numerator,
+                  this->denominator * frac.denominator);
+}
+
+Rational Rational::divide(const Rational &frac) const {
+  return Rational(this->numerator * frac.denominator,
+                  this->denominator * frac.numerator);
+}
+
+void Rational::display() const {
+  cout << this->numerator << " / " << this->denominator;
+}
+
+int Rational::gcd(int a, int b) const {
+  if (a == b)
+    return a;
+
+  int temp;
+  if (a < b) {
+    temp = a;
+    a = b;
+    b = temp;
+  }
+
+  int remainder;
+
+  do {
+    remainder = a % b;
+    a = b;
+    b = remainder;
+  } while (remainder != 0);
+
+  return a;
+}
+
+void Rational::simplify() {
+  int gcd = this->gcd(this->numerator, this->denominator);
+  this->numerator /= gcd;
+  this->denominator /= gcd;
+}
+
+// Do not change any of the code below this line!!
+
+Rational getRational();
+void displayResult(const string &, const Rational &, const Rational &,
+                   const Rational &);
+
+int main() {
+  Rational A, B, result;
+  char choice;
+
+  cout << "Enter Rational A:" << endl;
+  A = getRational();
+  cout << endl;
+
+  cout << "Enter Rational B:" << endl;
+  B = getRational();
+  cout << endl;
+
+  cout << "Enter Operation:" << endl
+       << "a - Addition (A + B)" << endl
+       << "s - Subtraction (A - B)" << endl
+       << "m - Multiplication (A * B)" << endl
+       << "d - Division (A / B)" << endl
+       << "y - Simplify A" << endl;
+  cin >> choice;
+  cout << endl;
+
+  if (choice == 'a') {
+    result = A.add(B);
+    displayResult("+", A, B, result);
+  } else if (choice == 's') {
+    result = A.subtract(B);
+    displayResult("-", A, B, result);
+  } else if (choice == 'm') {
+    result = A.multiply(B);
+    displayResult("*", A, B, result);
+  } else if (choice == 'd') {
+    result = A.divide(B);
+    displayResult("/", A, B, result);
+  } else if (choice == 'y') {
+    A.simplify();
+    A.display();
+  } else {
+    cout << "Unknown Operation";
+  }
+  cout << endl;
+
+  return 0;
+}
+
+Rational getRational() {
+  int choice;
+  int numer, denom;
+
+  cout << "Which Rational constructor? (Enter 2, 1, or 0)" << endl
+       << "2 - 2 parameters (numerator & denominator)" << endl
+       << "1 - 1 parameter (numerator)" << endl
+       << "0 - 0 parameters (default)" << endl;
+  cin >> choice;
+  cout << endl;
+
+  if (choice == 2) {
+    cout << "numerator? ";
+    cin >> numer;
+    cout << endl;
+    cout << "denominator? ";
+    cin >> denom;
+    cout << endl;
+    return Rational(numer, denom);
+  } else if (choice == 1) {
+    cout << "numerator? ";
+    cin >> numer;
+    cout << endl;
+    return Rational(numer);
+  } else {
+    return Rational();
+  }
+}
+
+void displayResult(const string &op, const Rational &lhs, const Rational &rhs,
+                   const Rational &result) {
+  cout << "(";
+  lhs.display();
+  cout << ") " << op << " (";
+  rhs.display();
+  cout << ") = (";
+  result.display();
+  cout << ")";
+}