C Programming on the IBM PC (C Programmers Reference Guide Series)
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isupper
#include <ctype.h>int isupper(int ch);
The isupper( ) function returns nonzero if ch is an uppercase letter; otherwise, zero is returned.
A related function is islower( ).
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#include <ctype.h>int isupper(int ch);
The isupper( ) function returns nonzero if ch is an uppercase letter; otherwise, zero is returned.
A related function is islower( ).
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