How can custom stream manipulators be used to modify future items on an output stream in C ?

Custom Stream Manipulators Modification in C

Modifying future items on a stream with custom manipulators is a versatile technique in C . While manipulators like "hex" alter the output format, manipulators that adjust values, like "plusone," provide even greater flexibility.

To store state in each stream, the iword function and xalloc index are employed.

Utilizing facets, numerical output can be customized. The my_num_put struct overrides the do_put method to increment values based on the stored state.

Applying this manipulator, numerical output is modified:

For single-item modification, resetting the word to 0 after each do_put call is recommended.

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