C++ int, DWORD and QWORD examples in detail

C++ int, DWORD and QWORD examples in detail

When talking about the C++ programming language, the following terms are often mentioned: int, DWORD, and QWORD. they are keywords used to represent different data types and lengths. Below is a detailed explanation of them along with examples:

：

• int is one of the data types that represent integers in C++.
• It is typically used to store signed integer values.
• The length of int may vary on different platforms, but is usually 4 bytes (32 bits).
• For example.int num = 10; An integer variable named num will be created and initialized to 10.

：

• DWORD is an unsigned integer type that stands for "Double Word".
• In C++, a DWORD is usually defined as a 32-bit unsigned integer.
• DWORDs are primarily used to interact with the operating system and handle the underlying data structures.
• For example, many functions in the Windows API use DWORD as a parameter or return type, such as DWORD WINAPI GetTickCount(); Returns the number of milliseconds since system startup.

：

• QWORD is an unsigned integer type that stands for "Quad Word".
• In C++, a QWORD is usually defined as a 64-bit unsigned integer.
• QWORD is mainly used to handle large integer values, or when a larger range of values is required.
• For example, the QWORD type can be used when dealing with file sizes, memory allocations, and other situations that require a large range of values.

Note that the exact lengths of int, DWORD, and QWORD may vary depending on the compiler, operating system, and hardware architecture. The above length descriptions are common assumptions for the general case.

Here are some examples:

int age = 25;
// Define an integer variable called age and initialize it to 25
DWORD dwValue = 0x12345678;
// Define a DWORD variable named dwValue and initialize it to 0x12345678
QWORD qValue = 1234567890123456;
// Define a file namedqValue(used form a nominal expression)QWORDvariant，and initialize it to1234567890123456

Difference between DWORD and int in C++

INT for int.
DWORD stands for unsigned long
The int changes with the number of bits in the machine, e.g. 16 for on a 16-bit machine, 32 for on a 32-bit machine, and 64 for on a 64-bit machine. Just look at the original definition.

DWORD is unsigned, equivalent to unsigned long, it is the MFC data type.
And int is symbolic, and the number of bytes he takes up isn't necessarily 4, mainly related to your
IDE related, like in Turbo C it's 2 bytes, in VC6.0 it's 4 bytes

Never think of int as 32-bit

It's been in the book for a long time.

long 32-bit signed integer
int 32-bit signed integer
DWORD 32-bit unsigned integer

typedef unsigned long DWORD;

DWORD is generally used when the return value will not be negative.

Whether to use int or DWORD depends on the situation.

This article on C++ int, DWORD and QWORD is introduced to this article, more related to C++ int, DWORD and QWORD content, please search for my previous articles or continue to browse the following related articles I hope you will support me more in the future!