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Is `long` 64-bit on 64-bit Windows?

Patricia Arquette

Dec 28, 2024 am 10:03 AM

Is `long` 64-bit on 64-bit Windows?

Bit Size of Long on 64-Bit Windows

The question of whether long is 64 bits on 64-bit machines has caused some confusion. While it is generally agreed upon that long is 64 bits on most 64-bit Unix systems, including macOS X and Linux, the situation on Windows is different.

According to the documentation provided by Intel, "Windows: long and int remain 32-bit in length, and special new data types are defined for 64-bit integers." This means that on 64-bit Windows, long is still 32 bits. To handle 64-bit integers on Windows, special data types such as long long or int64_t must be used.

Implications for Program Design

When designing software for multiple platforms, it is important to consider the different ways in which integer data types are handled. For platform-neutral code, using the C99 header is recommended. This header provides platform-independent type definitions for different integer sizes, such as int8_t, int32_t, and int64_t.

Conclusion

On 64-bit Windows, long remains a 32-bit data type. To handle 64-bit integers, special data types such as long long or int64_t must be used. When designing software for multiple platforms, it is important to consider the different data type sizes and use platform-neutral definitions to ensure portability.

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