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32 and 64-bit operating system condition compilation problems, thank you

Source: Internet
Author: User
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32 and 64-bit operating system condition compilation problems, thank you-General Linux technology-Linux programming and kernel information, the following is a detailed reading. I want to write a program that can run on a 32-bit operating system and a 64-bit operating system. The program uses long (4 bytes in 32-bit ), during compilation in a 64-bit operating system, I still want to use 4 bytes (64-bit operating system long is 8 bytes, so the conditional compilation should be changed to: int ), I don't know how to identify the number of digits of the current compiled operating system. please give me some advice. thank you!

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