08-19-2011
Well. You code doesn't work. And it doesn't work in many places - from simple errors (like letter=letter2) to logic (assignment Z to letter, don't check for length of input, etc.)
I really don't know how to help you. Just several advises:
1. You should write you script at little pieces and test it after every change.
2. You should use the whole working script for changes, not a fragment.
3. You should write you attentions as pseudo-code in words.
4. You should break your problem to little ones and decide them separately.
If you have time maybe tomorrow I can help you. Today I'm out.
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LEARN ABOUT CENTOS
tolower
TOUPPER(3) Linux Programmer's Manual TOUPPER(3)
NAME
toupper, tolower - convert letter to upper or lower case
SYNOPSIS
#include <ctype.h>
int toupper(int c);
int tolower(int c);
DESCRIPTION
toupper() converts the letter c to upper case, if possible.
tolower() converts the letter c to lower case, if possible.
If c is not an unsigned char value, or EOF, the behavior of these functions is undefined.
RETURN VALUE
The value returned is that of the converted letter, or c if the conversion was not possible.
CONFORMING TO
C89, C99, 4.3BSD.
BUGS
The details of what constitutes an uppercase or lowercase letter depend on the current locale. For example, the default "C" locale does
not know about umlauts, so no conversion is done for them.
In some non-English locales, there are lowercase letters with no corresponding uppercase equivalent; the German sharp s is one example.
SEE ALSO
isalpha(3), setlocale(3), towlower(3), towupper(3), locale(7)
COLOPHON
This page is part of release 3.53 of the Linux man-pages project. A description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
GNU
1993-04-04 TOUPPER(3)