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1. Index of Standard C Header Files

The C Standard requires that a freestanding implementation need supply the capabilities defined in only four of the standard headers - <float.h>, <limits.h>, <stdarg.h>, and <stddef.h>.  It can supply more.

To qualify as a hosted environment, the entire Standard C library must be provided.

There are 15 standard headers:

    1.1  <assert.h>     1.4  <float.h>     1.7  <math.h>     1.10 <stdarg.h>     1.13 <stdlib.h>
    1.2  <ctype.h>     1.5  <limits.h>     1.8  <setjmp.h>     1.11 <stddef.h>     1.14 <string.h>
    1.3  <errno.h>     1.6  <locale.h>     1.9  <signal.h>     1.12 <stdio.h>     1.15 <time.h>
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