diff --git a/src/fraction.cc b/src/fraction.cc
new file mode 100644
index 0000000..e7c1b57
--- /dev/null
+++ b/src/fraction.cc
@@ -0,0 +1,44 @@
+#include "fraction.h"
+
+fraction fraction::operator+(const fraction &frac) {
+        fraction tmp = *this;
+        tmp.numerator = tmp.numerator * frac.denominator +
+                        tmp.denominator * frac.numerator;
+        tmp.denominator = tmp.denominator * frac.denominator;
+        return tmp.simplify();
+}
+
+fraction fraction::operator*(const fraction &frac) {
+        fraction tmp = *this;
+        tmp.numerator = tmp.numerator * frac.numerator;
+        tmp.denominator = tmp.denominator * frac.denominator;
+        return tmp.simplify();
+}
+
+bool fraction::operator==(const fraction &frac) {
+        this->simplify();
+        return gcd(frac.numerator, this->numerator) == this->numerator &&
+               gcd(frac.denominator, this->denominator) == this->denominator;
+}
+
+bool fraction::operator!=(const fraction &frac) {
+        return !(*this == frac);
+}
+
+fraction &fraction::simplify() {
+        int g = gcd(numerator, denominator);
+        numerator /= g;
+        denominator /= g;
+        return *this;
+}
+
+float fraction::real() {
+        return (float)numerator / denominator;
+}
+
+int fraction::gcd(int a, int b) {
+        if (a % b == 0)
+                return b;
+
+        return gcd(b, a % b);
+}
diff --git a/src/fraction.h b/src/fraction.h
new file mode 100644
index 0000000..59cd82c
--- /dev/null
+++ b/src/fraction.h
@@ -0,0 +1,18 @@
+#ifndef __FRACTION_H__
+#define __FRACTION_H__
+
+struct fraction final {
+        int numerator;
+        int denominator;
+
+        fraction operator+(const fraction &frac);
+        fraction operator*(const fraction &frac);
+        bool operator==(const fraction &frac);
+        bool operator!=(const fraction &frac);
+        fraction &simplify();
+        float real();
+private:
+        int gcd(int a, int b);
+};
+
+#endif
diff --git a/src/log.cc b/src/log.cc
new file mode 100644
index 0000000..a990d9f
--- /dev/null
+++ b/src/log.cc
@@ -0,0 +1,10 @@
+#include "log.h"
+
+#include <utility>
+
+logger::logger(std::ofstream &&new_out):
+        out{std::move(new_out)} {}
+
+void logger::render() {
+
+}
diff --git a/src/log.h b/src/log.h
index b82e1f9..342329d 100644
--- a/src/log.h
+++ b/src/log.h
@@ -2,6 +2,7 @@
 #define __LOG_H__
 #include <fstream>
 #include <string>
+#include <vector>
 #include <memory>
 #include "constants.h"
 #include "characters.h"
@@ -10,6 +11,7 @@
 class logger final {
 private:
         std::ofstream out;
+        std::vector<char> display;
 public:
         logger(std::ofstream &&new_out);
 
diff --git a/src/rng.cc b/src/rng.cc
index 4f204e6..2cd54bb 100644
--- a/src/rng.cc
+++ b/src/rng.cc
@@ -32,6 +32,10 @@ int RNG::get_curr_rand_num() const {
         return curr_rand_num;
 }
 
+bool RNG::trial(fraction &psuccess) {
+        return (rand() % psuccess.denominator) < psuccess.numerator;
+}
+
 template<class T> T &RNG::get_rand_in_vector(const std::vector<T> &vec) {
         curr_rand_num = rand();
 
diff --git a/src/rng.h b/src/rng.h
index 4fd8bcf..037d6bb 100644
--- a/src/rng.h
+++ b/src/rng.h
@@ -5,6 +5,8 @@
 #include <stdlib.h>
 #include <vector>
 
+#include "fraction.h"
+
 // Technically, you should ONLY define one rng for the entire program
 // IMPORTANT: pass all RNG objects as references
 class RNG final {
@@ -24,6 +26,8 @@ public:
         unsigned int get_init_seed() const;
         int get_curr_rand_num() const;
 
+        bool trial(fraction &psuccess);
+
         template<class T> T &get_rand_in_vector(const std::vector<T> &vec);
 };