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kp3_1.cpp

@@ -0,0 +1,104 @@
+#include <iostream>
+#include <cassert>
+#include <cstdint>
+
+using namespace std;
+
+char nibble_to_hex(uint8_t i)
+{
+    assert(0x0 <= i && i <= 0xf);
+    const char digits[] = "0123456789abcdef";
+    return digits[i];
+}
+
+uint8_t get_lower_nibble(uint8_t byte)
+{
+    return byte & 0x0F;
+}
+
+uint8_t get_upper_nibble(uint8_t byte)
+{
+    return byte >> 4;
+}
+
+void print_in_hex(uint8_t byte)
+{
+    cout << nibble_to_hex(get_upper_nibble(byte))
+        << nibble_to_hex(get_lower_nibble(byte));
+}
+
+const uint8_t* as_bytes(const void* data)
+{
+    return reinterpret_cast<const uint8_t*>(data);
+}
+
+void print_in_hex(const void* data, size_t size)
+{
+    const uint8_t* bytes = as_bytes(data);
+    for (size_t i = 0; i < size; i++)
+    {
+        print_in_hex(bytes[i]);
+        if ((i + 1) % 16 == 0)
+        {
+            cout << '\n';
+        }
+        else
+        {
+            cout << ' ';
+        }
+    }
+}
+
+void print_in_binary(uint8_t byte)
+{
+    for (int bit = 7; bit >= 0; --bit)
+    {
+        cout << ((byte & (1 << bit)) ? '1' : '0');
+    }
+}
+
+void print_in_binary(const void* data, size_t size)
+{
+    const uint8_t* bytes = as_bytes(data);
+    for (size_t i = 0; i < size; i++)
+    {
+        print_in_binary(bytes[i]);
+        if ((i + 1) % 4 == 0)
+        {
+            cout << '\n';
+        }
+        else
+        {
+            cout << ' ';
+        }
+    }
+}
+
+int main()
+{
+    for (uint8_t i = 0; i < 16; i++)
+    {
+        assert(nibble_to_hex(i) == (i < 10 ? '0' + i : 'a' + (i - 10)));
+    }
+
+    uint8_t byte = 0xab;
+
+    cout << "Hex: ";
+    print_in_hex(byte);
+    cout << '\n';
+
+    cout << "Binary: ";
+    print_in_binary(byte);
+    cout << '\n';
+
+    uint32_t u32 = 0x42;
+    cout << "u32 bytes in hex: ";
+    print_in_hex(&u32, sizeof(u32));
+    cout << '\n';
+
+    cout << "u32 bytes in binary: ";
+    print_in_binary(&u32, sizeof(u32));
+    cout << '\n';
+
+    return 0;
+}