diff --git a/HW7/BinaryRepresentation/Makefile b/HW7/BinaryRepresentation/Makefile
new file mode 100644
index 0000000..4a41043
--- /dev/null
+++ b/HW7/BinaryRepresentation/Makefile
@@ -0,0 +1,26 @@
+CC = gcc
+CFLAGS = -Iinclude -Wall -Wextra
+
+SRC = main.c src/logic.c
+TEST_SRC = tests/tests.c
+
+OUT = program
+TEST_OUT = testProgram
+
+all: $(OUT)
+
+$(OUT): $(SRC)
+	$(CC) $(CFLAGS) $(SRC) -o $(OUT)
+
+test: src/logic.c tests/tests.c
+	$(CC) $(CFLAGS) -DTEST_MAIN src/logic.c tests/tests.c -o $(TEST_OUT)
+
+clean:
+	rm -f $(OUT) $(TEST_OUT)
+
+format:
+	find . -path ./build -prune -o -type f \( -path "./src/*" -o -path "./include/*" -o -path "./tests/*" -o -name "main.c" \) \( -name '*.c' -o -name '*.h' \) -print | xargs clang-format --style=file -i
+
+format-check:
+	find . -path ./build -prune -o -type f \( -path "./src/*" -o -path "./include/*" -o -path "./tests/*" -o -name "main.c" \) \( -name '*.c' -o -name '*.h' \) -print | xargs clang-format --style=file --dry-run -Werror
+
diff --git a/HW7/BinaryRepresentation/include/logic.h b/HW7/BinaryRepresentation/include/logic.h
new file mode 100644
index 0000000..5f51588
--- /dev/null
+++ b/HW7/BinaryRepresentation/include/logic.h
@@ -0,0 +1,8 @@
+#pragma once
+
+extern const int BITS_NUM;
+
+char* toTwosComplement(int num);
+void printBinary(const char* binaryStr);
+char* binaryAddition(const char* firstBin, const char* secBin);
+int toDecimal(const char* binaryStr);
diff --git a/HW7/BinaryRepresentation/main.c b/HW7/BinaryRepresentation/main.c
new file mode 100644
index 0000000..fd82548
--- /dev/null
+++ b/HW7/BinaryRepresentation/main.c
@@ -0,0 +1,39 @@
+#include "include/logic.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+int main()
+{
+    int firstNum, secNum;
+    printf("First number = ");
+    if (scanf("%d", &firstNum) != 1) {
+        printf("Invalid input\n");
+        return 1;
+    }
+    printf("Second number = ");
+    if (scanf("%d", &secNum) != 1) {
+        printf("Invalid input\n");
+        return 1;
+    }
+
+    char* firstBin = toTwosComplement(firstNum);
+    char* secBin = toTwosComplement(secNum);
+    printf("First binary:\n");
+    printBinary(firstBin);
+    printf("Second binary:\n");
+    printBinary(secBin);
+
+    char* addition = binaryAddition(firstBin, secBin);
+    printf("Addition:\n");
+    printBinary(addition);
+
+    int decimal = toDecimal(addition);
+    printf("Decimal:\n%d", decimal);
+
+    free(firstBin);
+    free(secBin);
+    free(addition);
+
+    return 0;
+}
diff --git a/HW7/BinaryRepresentation/src/logic.c b/HW7/BinaryRepresentation/src/logic.c
new file mode 100644
index 0000000..ad1235c
--- /dev/null
+++ b/HW7/BinaryRepresentation/src/logic.c
@@ -0,0 +1,59 @@
+#include "../include/logic.h"
+#include <stdio.h>
+#include <stdlib.h>
+
+const int BITS_NUM = sizeof(int) * 8;
+
+char* toTwosComplement(const int num)
+{
+    char* binaryStr = (char*)malloc(BITS_NUM + 1);
+    unsigned int mask = 1 << (BITS_NUM - 1);
+
+    unsigned int uNum = (unsigned int)num;
+
+    for (int i = 0; i < BITS_NUM; ++i) {
+        binaryStr[i] = (uNum & mask) ? '1' : '0';
+        mask >>= 1;
+    }
+    binaryStr[BITS_NUM] = '\0';
+
+    return binaryStr;
+}
+
+void printBinary(const char* binaryStr)
+{
+    for (int i = 0; i < BITS_NUM; ++i) {
+        printf("%c", binaryStr[i]);
+        if ((i + 1) % 8 == 0 && i != BITS_NUM - 1)
+            printf(" ");
+    }
+    printf("\n");
+}
+
+char* binaryAddition(const char* firstBin, const char* secBin)
+{
+    char* binaryStr = (char*)malloc(BITS_NUM + 1);
+
+    int carry = 0;
+    for (int i = BITS_NUM - 1; i >= 0; --i) {
+        int firstBit = firstBin[i] - '0';
+        int secBit = secBin[i] - '0';
+
+        int sum = firstBit + secBit + carry;
+        binaryStr[i] = (sum % 2) + '0';
+        carry = sum / 2;
+    }
+    binaryStr[BITS_NUM] = '\0';
+
+    return binaryStr;
+}
+
+int toDecimal(const char* binaryStr)
+{
+    unsigned int decimal = 0;
+
+    for (int i = 0; i < BITS_NUM; ++i)
+        decimal = (decimal << 1) | (binaryStr[i] - '0');
+
+    return (int)decimal;
+}
diff --git a/HW7/BinaryRepresentation/tests/tests.c b/HW7/BinaryRepresentation/tests/tests.c
new file mode 100644
index 0000000..cea0a1b
--- /dev/null
+++ b/HW7/BinaryRepresentation/tests/tests.c
@@ -0,0 +1,107 @@
+#include "../include/logic.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+int assertInt(const char* name, int got, int expected)
+{
+    if (got != expected) {
+        printf("Failed %s: got: %d, expected: %d\n", name, got, expected);
+        return 0;
+    }
+    printf("Passed %s\n", name);
+    return 1;
+}
+
+int assertStr(const char* name, const char* got, const char* expected)
+{
+    if (strcmp(got, expected) != 0) {
+        printf("Failed %s: got: %s, expected: %s\n", name, got, expected);
+        return 0;
+    }
+    printf("Passed %s\n", name);
+    return 1;
+}
+
+void testToTwosComplementPositive()
+{
+    char* b = toTwosComplement(5);
+    char expected[BITS_NUM + 1];
+    for (int i = 0; i < BITS_NUM; ++i)
+        expected[i] = '0';
+    expected[BITS_NUM - 3] = '1';
+    expected[BITS_NUM - 1] = '1';
+    expected[BITS_NUM] = '\0';
+    assertStr("toTwosComplement(5)", b, expected);
+    free(b);
+}
+
+void testToTwosComplementNegative()
+{
+    char* b = toTwosComplement(-1);
+    char expected[BITS_NUM + 1];
+    for (int i = 0; i < BITS_NUM; ++i)
+        expected[i] = '1';
+    expected[BITS_NUM] = '\0';
+    assertStr("toTwosComplement(-1)", b, expected);
+    free(b);
+}
+
+void testBinaryAdditionPositive()
+{
+    char* a = toTwosComplement(5);
+    char* b = toTwosComplement(7);
+    char* sum = binaryAddition(a, b);
+    int dec = toDecimal(sum);
+    assertInt("binaryAddition(5+7)", dec, 12);
+    free(a);
+    free(b);
+    free(sum);
+}
+
+void testBinaryAdditionNegative()
+{
+    char* a = toTwosComplement(-5);
+    char* b = toTwosComplement(1);
+    char* sum = binaryAddition(a, b);
+    int dec = toDecimal(sum);
+    assertInt("binaryAddition(-5+1)", dec, -4);
+    free(a);
+    free(b);
+    free(sum);
+}
+
+void testToDecimalZero()
+{
+    char* a = toTwosComplement(0);
+    int dec = toDecimal(a);
+    assertInt("toDecimal(0)", dec, 0);
+    free(a);
+}
+
+void testToDecimalNegative()
+{
+    char* a = toTwosComplement(-1);
+    int dec = toDecimal(a);
+    assertInt("toDecimal(-1)", dec, -1);
+    free(a);
+}
+
+void runTests()
+{
+    testToTwosComplementPositive();
+    testToTwosComplementNegative();
+    testBinaryAdditionPositive();
+    testBinaryAdditionNegative();
+    testToDecimalZero();
+    testToDecimalNegative();
+    printf("All tests finished.\n");
+}
+
+#ifdef TEST_MAIN
+int main()
+{
+    runTests();
+    return 0;
+}
+#endif