Files and Strings

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Classes for Files and Strings
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   There are two very common special cases of input and output: using
files, and using strings in memory.

   `libio' defines four specialized classes for these cases:

`ifstream'
     Methods for reading files.

`ofstream'
     Methods for writing files.

`istrstream'
     Methods for reading strings from memory.

`ostrstream'
     Methods for writing strings in memory.

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