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What are the functions of the following header files:
(i) ctype.h
(ii) string.h
(i) ctype.h: It is a header file that having character testing and conversion functions.
For example isalpha (c) returns an int type data and verify if the argument c is alphabetic. It returns nonzero value if true; 0 or else. toascii(c ): is a conversion function described in ctype.h that changes value of argument to ascii.
(ii) string.h: It is also a standard header file that having string manipulation funcions.
For example strcmp(c1,c2) function compares two strings c1 and c2 lexicographically. It returns a negative value if c1c2.
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