ExplanationIn the above program instead of using macros their corresponding macro expansion is
usedin the program. The first macro expansion&_streams fO] reads string through the keyboard
and the second &_streams [1] displaysit.
11.15 THE PREDEFINED MACROS IN ctype. h
The header file *c type. h" contains a set of macros that checks character. The Table 11.9 describes all
the macros. These macros take an argument of integer type and return an integer.
Table 11.9 Predefined macros in ctype. h.
SR. NO.Macro
Returns true (!0) value if
01
isalpha (d)
d is a letter
02
i supper (d)
disa capital ...
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