<string.h>
The <string.h> include file declares the string manipulation functions:
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Note: 1 These functions are available for C++ programs. They are available for C only
when the program defines the __cplusplus__strings__ macro.
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The <string.h> include file also defines the macro NULL, and the type size_t.
For more information about NULL and the type size_t, see <stddef.h>.