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Top Forums UNIX for Dummies Questions & Answers Comparing the characters of 2 variables Post 302557095 by Corona688 on Tuesday 20th of September 2011 11:32:52 AM
Old 09-20-2011
What's your system? What's your shell? If your shell doesn't even have substring operations this could be painful, if it has arrays, it's a snap.

If you can avoid it, a string might not be the best way to handle this, how about an array? The computer has an array like ( k i t t e n ), the user gets an array full of ( '' '' '' '' '' '' ). Whenever the user types a letter, loop through the 'kitten' array to see if the letter matches, and if it does, fill it into the user array.

Otherwise you could do this with substring operations, looping through "kitten" one by one and comparing it to an array full of spaces, if it matches replace one space by the letter. How to do this depends on your shell -- not all of them even have string operations...
 
Test Your Knowledge in Computers #457
Difficulty: Easy
NTP was created to synchronize all participating computers to within a few milliseconds of Coordinated Universal Time (UTC).
True or False?

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WCSXFRM(3)						   BSD Library Functions Manual 						WCSXFRM(3)

NAME
wcsxfrm, wcsxfrm_l -- transform a wide string under locale LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <wchar.h> size_t wcsxfrm(wchar_t *restrict ws1, const wchar_t *restrict ws2, size_t n); #include <wchar.h> #include <xlocale.h> size_t wcsxfrm_l(wchar_t *restrict ws1, const wchar_t *restrict ws2, size_t n, locale_t loc); DESCRIPTION
The wcsxfrm() function transforms a null-terminated wide character string pointed to by ws2, according to the current locale's collation order, then copies the transformed string into ws1. No more than n wide characters are copied into ws1, including the terminating null char- acter. If n is set to 0 (it helps to determine an actual size needed for transformation), ws1 is permitted to be a NULL pointer. Comparing two strings using wcscmp() after wcsxfrm() is equivalent to comparing two original strings with wcscoll(). Although the wcsxfrm() function uses the current locale, the wcsxfrm_l() function may be passed a locale directly. See xlocale(3) for more information. RETURN VALUES
Upon successful completion, wcsxfrm() returns the length of the transformed string not including the terminating null character. If this value is n or more, the contents of ws1 are indeterminate. SEE ALSO
setlocale(3), strxfrm(3), wcscmp(3), wcscoll(3), xlocale(3) STANDARDS
The wcsxfrm() function conforms to ISO/IEC 9899:1999 (``ISO C99''). BUGS
The current implementation of wcsxfrm() only works in single-byte LC_CTYPE locales, and falls back to using wcsncpy() in locales with extended character sets. Comparing two strings using wcscmp() after wcsxfrm() is not always equivalent to comparison with wcscoll(); wcsxfrm() only stores information about primary collation weights into ws1, whereas wcscoll() compares characters using both primary and secondary weights. BSD
October 4, 2002 BSD

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