From 44b0694e9d6bb4dd853987be17181ebd77526a91 Mon Sep 17 00:00:00 2001
From: asaky <savchenko.4leksei@yandex.ru>
Date: Sat, 16 May 2026 19:04:23 +0300
Subject: [PATCH] add files

---
 CMakeLists.txt          | 22 +++++++++++++++++++++
 include/calculator.h    |  9 +++++++++
 src/calculator.c        | 21 +++++++++++++++++++++
 tests/test_calculator.c | 42 +++++++++++++++++++++++++++++++++++++++++
 4 files changed, 94 insertions(+)
 create mode 100644 CMakeLists.txt
 create mode 100644 include/calculator.h
 create mode 100644 src/calculator.c
 create mode 100644 tests/test_calculator.c

diff --git a/CMakeLists.txt b/CMakeLists.txt
new file mode 100644
index 0000000..2a0014b
--- /dev/null
+++ b/CMakeLists.txt
@@ -0,0 +1,22 @@
+cmake_minimum_required(VERSION 3.10)
+project(Calculator VERSION 1.0 LANGUAGES C)
+
+set(CMAKE_C_STANDARD 11)
+set(CMAKE_C_STANDARD_REQUIRED ON)
+
+enable_testing()
+
+add_library(calculator src/calculator.c)
+target_include_directories(calculator PUBLIC include)
+
+add_executable(main src/calculator.c)
+target_include_directories(main PUBLIC include)
+
+add_executable(test_calculator tests/test_calculator.c)
+target_link_libraries(test_calculator calculator m)
+target_include_directories(test_calculator PRIVATE include)
+
+add_test(NAME CalculatorTests COMMAND test_calculator)
+
+install(TARGETS calculator main DESTINATION bin)
+install(FILES include/calculator.h DESTINATION include)
diff --git a/include/calculator.h b/include/calculator.h
new file mode 100644
index 0000000..6a8ce7d
--- /dev/null
+++ b/include/calculator.h
@@ -0,0 +1,9 @@
+#ifndef CALCULATOR_H
+#define CALCULATOR_H
+
+int add(int a, int b);
+int subtract(int a, int b);
+int multiply(int a, int b);
+double divide(int a, int b);
+
+#endif
diff --git a/src/calculator.c b/src/calculator.c
new file mode 100644
index 0000000..d1a59e1
--- /dev/null
+++ b/src/calculator.c
@@ -0,0 +1,21 @@
+#include "calculator.h"
+
+int add(int a, int b) {
+    return a + b;
+}
+
+int subtract(int a, int b) {
+    return a - b;
+}
+
+int multiply(int a, int b) {
+    return a * b;
+}
+
+double divide(int a, int b) {
+    if (b == 0) {
+        return 0.0;
+    }
+    return (double)a / b;
+}
+EOF
diff --git a/tests/test_calculator.c b/tests/test_calculator.c
new file mode 100644
index 0000000..8170959
--- /dev/null
+++ b/tests/test_calculator.c
@@ -0,0 +1,42 @@
+#include <stdio.h>
+#include <assert.h>
+#include <math.h>
+#include "calculator.h"
+
+void test_add() {
+    assert(add(2, 3) == 5);
+    assert(add(-1, 1) == 0);
+    assert(add(0, 0) == 0);
+    printf("test_add passed\n");
+}
+
+void test_subtract() {
+    assert(subtract(5, 3) == 2);
+    assert(subtract(1, 1) == 0);
+    assert(subtract(0, 5) == -5);
+    printf("test_subtract passed\n");
+}
+
+void test_multiply() {
+    assert(multiply(3, 4) == 12);
+    assert(multiply(0, 5) == 0);
+    assert(multiply(-2, 3) == -6);
+    printf("test_multiply passed\n");
+}
+
+void test_divide() {
+    assert(fabs(divide(10, 2) - 5.0) < 0.001);
+    assert(fabs(divide(7, 2) - 3.5) < 0.001);
+    assert(divide(5, 0) == 0.0);
+    printf("test_divide passed\n");
+}
+
+int main() {
+    printf("Running calculator tests...\n\n");
+    test_add();
+    test_subtract();
+    test_multiply();
+    test_divide();
+    printf("\nAll tests passed!\n");
+    return 0;
+}