From 54998f65623efbac1d41485a2257d043ca7ac56b Mon Sep 17 00:00:00 2001
From: DolzhenkoAlexa <dolzhenko.sasha2006@mail.ru>
Date: Sat, 20 Dec 2025 20:40:44 +0300
Subject: [PATCH 1/4] Create CMakeLists.txt

---
 src/hw12_doubleExp/CMakeLists.txt | 6 ++++++
 1 file changed, 6 insertions(+)
 create mode 100644 src/hw12_doubleExp/CMakeLists.txt

diff --git a/src/hw12_doubleExp/CMakeLists.txt b/src/hw12_doubleExp/CMakeLists.txt
new file mode 100644
index 0000000..b6794b7
--- /dev/null
+++ b/src/hw12_doubleExp/CMakeLists.txt
@@ -0,0 +1,6 @@
+cmake_minimum_required(VERSION 4.0)
+project(hw12_doubleExp C)
+
+set(CMAKE_C_STANDARD 17)
+
+add_executable(hw12_doubleExp main.c doubleExp.c doubleExp.h)

From e34eaa0e57a2d085936fed632a4bf522421754b5 Mon Sep 17 00:00:00 2001
From: DolzhenkoAlexa <dolzhenko.sasha2006@mail.ru>
Date: Sat, 20 Dec 2025 20:41:11 +0300
Subject: [PATCH 2/4] Create main.c

---
 src/hw12_doubleExp/main.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)
 create mode 100644 src/hw12_doubleExp/main.c

diff --git a/src/hw12_doubleExp/main.c b/src/hw12_doubleExp/main.c
new file mode 100644
index 0000000..150f2ac
--- /dev/null
+++ b/src/hw12_doubleExp/main.c
@@ -0,0 +1,12 @@
+#include <stdio.h>
+#include "doubleExp.h"
+
+int main(void)
+{
+    double x;
+    printf("Введите число: ");
+    scanf("%lf", &x);
+    doubleExp(x);
+
+    return 0;
+}

From 0219761d35c73049ae90b7d4ac3bce5da57054da Mon Sep 17 00:00:00 2001
From: DolzhenkoAlexa <dolzhenko.sasha2006@mail.ru>
Date: Sat, 20 Dec 2025 20:41:42 +0300
Subject: [PATCH 3/4] Create doubleExp.c

---
 src/hw12_doubleExp/doubleExp.c | 76 ++++++++++++++++++++++++++++++++++
 1 file changed, 76 insertions(+)
 create mode 100644 src/hw12_doubleExp/doubleExp.c

diff --git a/src/hw12_doubleExp/doubleExp.c b/src/hw12_doubleExp/doubleExp.c
new file mode 100644
index 0000000..32d7502
--- /dev/null
+++ b/src/hw12_doubleExp/doubleExp.c
@@ -0,0 +1,76 @@
+#include "doubleExp.h"
+#include <stdio.h>
+#include "doubleExp.h"
+
+typedef union DoubleUnion {
+    double value;
+    unsigned char bytes[8];
+} DoubleUnion;
+
+// Получение бита i
+static int getBitI(const DoubleUnion *d, int i)
+{
+    int byte = i / 8;
+    int bit  = i % 8;
+
+    // Пролучаем нужный байт и сдвигаем его на позицию 0
+    char neededByte = d->bytes[byte];
+    char changePosition = neededByte >> bit;
+
+    return changePosition & 1;
+}
+
+void doubleExp(double x)
+{
+    DoubleUnion d;
+    d.value = x;
+
+    // Определяем знак
+    int signI = getBitI(&d, 63);
+    char sign;
+    if (signI)
+        sign = '-';
+    else
+        sign = '+';
+
+    int exp = 0;
+    for (int i = 62; i >= 52; i--) {
+        exp = (exp << 1) | getBitI(&d, i);
+    }
+
+    // Достаем мантиссу
+    long long mantissaBits = 0;
+    for (int i = 51; i >= 0; i--) {
+        mantissaBits = (mantissaBits << 1) | getBitI(&d, i);
+    }
+
+    // Проверка для INF и NaN
+    if (exp == 2047) {
+        if (mantissaBits == 0) {
+            printf("%cINF\n", sign);
+        } else {
+            printf("NaN\n");
+        }
+        return;
+    }
+
+    // Проверка для +0 и -0
+    if (exp == 0 && mantissaBits == 0) {
+        printf("%c0\n", sign);
+        return;
+    }
+
+    double mantissa = 1.0;
+    double fractionPart = 0.5;
+    for (int i = 51; i >= 0; i--) {
+        if (getBitI(&d, i)) {
+            mantissa += fractionPart;
+        }
+        fractionPart /= 2.0;
+    }
+
+    // Так как в double порядок смещен на 1023, то получаем настоящий вычетанием
+    int power = exp - 1023;
+
+    printf("Результат: %c%.20f*2^%d\n", sign, mantissa, power);
+}

From fc32227f6681b69c4bb5b25f95f87607d6ee28a6 Mon Sep 17 00:00:00 2001
From: DolzhenkoAlexa <dolzhenko.sasha2006@mail.ru>
Date: Sat, 20 Dec 2025 20:42:05 +0300
Subject: [PATCH 4/4] Create doubleExp.h

---
 src/hw12_doubleExp/doubleExp.h | 3 +++
 1 file changed, 3 insertions(+)
 create mode 100644 src/hw12_doubleExp/doubleExp.h

diff --git a/src/hw12_doubleExp/doubleExp.h b/src/hw12_doubleExp/doubleExp.h
new file mode 100644
index 0000000..18c4157
--- /dev/null
+++ b/src/hw12_doubleExp/doubleExp.h
@@ -0,0 +1,3 @@
+#include <stdio.h>
+
+void doubleExp(double x);