diff --git a/CMakeLists.txt b/CMakeLists.txt
new file mode 100644
index 0000000..78749ca
--- /dev/null
+++ b/CMakeLists.txt
@@ -0,0 +1,6 @@
+cmake_minimum_required(VERSION 3.23)
+project(second_lab)
+
+set(CMAKE_CXX_STANDARD 14)
+
+add_executable(second_lab calculator.cpp f2.cpp calculator.h f1.cpp)
diff --git a/Makefile.txt b/Makefile.txt
new file mode 100644
index 0000000..3b85fda
--- /dev/null
+++ b/Makefile.txt
@@ -0,0 +1,17 @@
+TARGET = second_lab
+CC=g++
+CFLAGS = -c
+
+SOURCES = calculator.cpp f1.cpp f2.cpp
+OBJ = $(SOURCES: .cpp=.o)
+
+all: $(TARGET) 
+
+$(TARGET): $(OBJ)
+	$(CC) $(OBJ) -o $(TARGET)
+
+%.o : %.cpp
+	$(CC) $(CFLAGS) $< -o $@	
+
+clean:
+	rm -rf *.o $(TARGET)
\ No newline at end of file
diff --git a/README.md b/README.md
deleted file mode 100644
index 406a423..0000000
--- a/README.md
+++ /dev/null
@@ -1,11 +0,0 @@
-Это нужно форкнуть!
-
-
-
-Оценки:
-
-| Фамилия, Имя | Группа      | Оценка (предв)|
-|--------------|:-----------:|---------------:|
-|Иванов Иван   | 213         | 10             |
-
-
diff --git a/calculator.cpp b/calculator.cpp
new file mode 100644
index 0000000..b8339dc
--- /dev/null
+++ b/calculator.cpp
@@ -0,0 +1,164 @@
+#include <iostream>
+#include <cstring>
+#include <fstream>
+#include "calculator.h"
+
+using std::cout;
+using std::cin;
+using std::endl;
+
+int main(int argc, char *argv[]) {
+    int i = 0, j = 0, n = 50;
+    double *numbers = new double[n], value, res;
+    char *signs = new char[n], arg = ' ', end = ' ';
+    bool first_flag = true;
+    if (argc == 2 && (strcmp(argv[1], "--forward") == 0 || strcmp(argv[1], "--reverse") == 0)) {
+        end = '\n';
+        while (arg != end) {
+            arg = cin.peek();
+            if (arg == ' ') {
+                cin.ignore();
+                continue;
+            }
+            if (arg >= '0' && arg <= '9') {
+                cin >> value;
+                numbers[i] = value;
+                i += 1;
+                continue;
+            }
+            if (arg == '+' || arg == '-' || arg == '*' || arg == '/' || arg == '(' || arg == ')' || arg == '^') {
+                if (j == 0 || (abs(TypeOfOperation(arg)) > abs(TypeOfOperation(signs[j - 1]))) ||
+                    TypeOfOperation(arg) == 1) {
+                    if ((j == 0 || j > 0 && TypeOfOperation(arg) == -2 && TypeOfOperation(signs[j - 1]) == 1) &&
+                        TypeOfOperation(arg) == -2 && strcmp(argv[1], "--forward") == 0) {
+                        numbers[i] = 0;
+                        i += 1;
+                        signs[j] = arg;
+                        j += 1;
+                    } else {
+                        signs[j] = arg;
+                        j += 1;
+                    }
+                    cin.ignore();
+                } else {
+                    if (TypeOfOperation(arg) == -1) {
+                        while (abs(TypeOfOperation(arg)) != abs(TypeOfOperation(signs[j - 1]))) {
+                            res = PerformingOperation(numbers[i - 2], numbers[i - 1], TypeOfOperation(signs[j - 1]));
+                            numbers[i - 2] = res; // i - 2
+                            j -= 1;
+                            i -= 1;
+                        }
+                        j -= 1;
+                        cin.ignore();
+                    } else {
+                        while (first_flag && abs(TypeOfOperation(arg)) <= abs(TypeOfOperation(signs[j - 1]))) {
+                            res = PerformingOperation(numbers[i - 2], numbers[i - 1], TypeOfOperation(signs[j - 1]));
+                            numbers[i - 2] = res; // i - 2
+                            j -= 1;
+                            i -= 1;
+                            if (j == 0) {
+                                signs[j] = arg;
+                                j += 1;
+                                cin.ignore();
+                                first_flag = false;
+                            }
+                        }
+                    }
+
+                }
+                continue;
+            }
+        }
+
+        if (j == 0) {
+            cout << numbers[0] << endl;
+        } else {
+            j -= 1;
+            i -= 1;
+            while (j != -1) {
+                res = PerformingOperation(numbers[i - 1], numbers[i], TypeOfOperation(signs[j]));
+                numbers[i - 1] = res;
+                j -= 1;
+                i -= 1;
+            }
+            cout << numbers[0] << endl;
+        }
+    } else if (argc >= 2 && strcmp("--file", argv[2]) == 0) {
+        std::ifstream input(argv[3]);
+        cin.rdbuf(input.rdbuf());
+        end = EOF;
+        while (arg != end) {
+            arg = cin.peek();
+            if (arg == ' ') {
+                cin.ignore();
+                continue;
+            }
+            if (arg >= '0' && arg <= '9') {
+                cin >> value;
+                numbers[i] = value;
+                i += 1;
+                continue;
+            }
+            if (arg == '+' || arg == '-' || arg == '*' || arg == '/' || arg == '(' || arg == ')' || arg == '^') {
+                if (j == 0 || (abs(TypeOfOperation(arg)) > abs(TypeOfOperation(signs[j - 1]))) ||
+                    TypeOfOperation(arg) == 1) {
+                    if ((j == 0 || j > 0 && TypeOfOperation(arg) == -2 && TypeOfOperation(signs[j - 1]) == 1) &&
+                        TypeOfOperation(arg) == -2 &&
+                        strcmp(argv[1], "--forward") == 0) {
+                        numbers[i] = 0;
+                        i += 1;
+                        signs[j] = arg;
+                        j += 1;
+                    } else {
+                        signs[j] = arg;
+                        j += 1;
+                    }
+                    cin.ignore();
+                } else {
+                    if (TypeOfOperation(arg) == -1) {
+                        while (abs(TypeOfOperation(arg)) != abs(TypeOfOperation(signs[j - 1]))) {
+                            res = PerformingOperation(numbers[i - 2], numbers[i - 1], TypeOfOperation(signs[j - 1]));
+                            numbers[i - 2] = res; // i - 2
+                            j -= 1;
+                            i -= 1;
+                        }
+                        j -= 1;
+                        cin.ignore();
+                    } else {
+                        while (first_flag && abs(TypeOfOperation(arg)) <= abs(TypeOfOperation(signs[j - 1]))) {
+                            res = PerformingOperation(numbers[i - 2], numbers[i - 1], TypeOfOperation(signs[j - 1]));
+                            numbers[i - 2] = res; // i - 2
+                            j -= 1;
+                            i -= 1;
+                            if (j == 0) {
+                                signs[j] = arg;
+                                j += 1;
+                                cin.ignore();
+                                first_flag = false;
+                            }
+                        }
+                    }
+
+                }
+                continue;
+            }
+        }
+
+        if (j == 0) {
+            cout << numbers[0] << endl;
+        } else {
+            j -= 1;
+            i -= 1;
+            while (j != -1) {
+                res = PerformingOperation(numbers[i - 1], numbers[i], TypeOfOperation(signs[j]));
+                numbers[i - 1] = res;
+                j -= 1;
+                i -= 1;
+            }
+            cout << numbers[0] << endl;
+        }
+        input.close();
+    }
+    delete[] numbers;
+    delete[] signs;
+}
\ No newline at end of file
diff --git a/calculator.h b/calculator.h
new file mode 100644
index 0000000..456760a
--- /dev/null
+++ b/calculator.h
@@ -0,0 +1,5 @@
+int TypeOfOperation(char);
+
+double PerformingOperation(double, double, int);
+
+
diff --git a/f1.cpp b/f1.cpp
new file mode 100644
index 0000000..a3e0707
--- /dev/null
+++ b/f1.cpp
@@ -0,0 +1,11 @@
+#include "calculator.h"
+#include <cmath>
+
+double PerformingOperation(double number_1, double number_2, int type_of_operation) {
+    if (type_of_operation == 2) return number_1 + number_2;
+    if (type_of_operation == -2) return number_1 - number_2;
+    if (type_of_operation == 3) return number_1 * number_2;
+    if (type_of_operation == -3) return number_1 / number_2;
+    if (type_of_operation == 4) return pow(number_1, number_2);
+    else return 0;
+}
\ No newline at end of file
diff --git a/f2.cpp b/f2.cpp
new file mode 100644
index 0000000..75c5d72
--- /dev/null
+++ b/f2.cpp
@@ -0,0 +1,12 @@
+#include "calculator.h"
+
+int TypeOfOperation(char sign) {
+    if (sign == '+') return 2;
+    if (sign == '-') return -2;
+    if (sign == '*') return 3;
+    if (sign == '/') return -3;
+    if (sign == '^') return 4;
+    if (sign == '(') return 1;
+    if (sign == ')') return -1;
+    else return 0;
+}
diff --git a/input.txt b/input.txt
new file mode 100644
index 0000000..0c1faa8
--- /dev/null
+++ b/input.txt
@@ -0,0 +1 @@
+2 + 2
\ No newline at end of file
diff --git a/second_lab b/second_lab
new file mode 100644
index 0000000..9befa8f
Binary files /dev/null and b/second_lab differ