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C166 User's Guide
#include <ctype.h> int tolower ( int c); /* character to convert */
The tolower function converts c to a lowercase character. If c is not an alphabetic letter, the tolower function has no effect.
The tolower function returns the lowercase equivalent of c.
_tolower, _toupper, toupper
#include <ctype.h> #include <stdio.h> /* for printf */ void tst_tolower (void) { unsigned char i; for (i = 0x20; i < 0x7F; i++) { printf ("tolower(%c) = %c\n", i, tolower(i)); } }
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