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Size: 520
Comment: Typedefs for int sizes
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Size: 927
Comment: Mixing char and int types
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* C and C++ do not specify whether the char data type is signed or unsigned. This can be a problem when mixing char and int types in code — the classic example is reading characters from stdin in C into a unsigned char using the getchar() function, which returns an int and typically uses –1 to indicate end of file. If you mix char and int types, explicitly declare the char as signed or unsigned. |
Tips for writing portable code
Many useful tips are taken from the book [http://proquest.safaribooksonline.com/9780321246424 Cross-Platform Development in C++: Building Mac OS X, Linux, and Windows Applications] by Syd Logan.
Coding
Use the -ansi or a comparable compiler option.
Use typedefs for integer types whenever the integer must be of a definite size. For example, define and use the type INT32 for integers that must consist of exactly 32 bits on all target platforms.
- C and C++ do not specify whether the char data type is signed or unsigned. This can be a problem when mixing char and int types in code — the classic example is reading characters from stdin in C into a unsigned char using the getchar() function, which returns an int and typically uses –1 to indicate end of file. If you mix char and int types, explicitly declare the char as signed or unsigned.