In my January 2001 column, I discussed how the introduction of 64-bit machines motivated C99 to generalize the rules for integer types and to allow new integer types as extensions. But, C99 did not describe any syntax for naming these new integer types. This seems to put programmers in an awkward position. Your implementation might support additional integer types. You might find such types useful. However, lacking a standardized syntax, it appears that you must learn about implementation-specific extensions to use new integer types, and that such uses automatically eliminate your chances for portability. This month, we see that C99 actually provides a solution to this problem that might even help with related portability problems. Interestingly, the 64-bit machines again thrust the issue before the standards committee.

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