Hi guys , in my study book from which I re-learn C is task to generate all possible characters combination from numbers entered by the user. I know this algorithm must use combinatorics to calculate all permutations. Problem is how to implement algortihm.
Code:
// This program reads the four numbers from the user
// and saves them into the array. Once all numbers entered
// program will translate input numbers to letters
// like we have on phone keys, zero and and one will
// be translated into the space
// Author: solaris_user
// Date: 08.05.2011
#include <stdio.h>
#define ARRAY_SIZE 4
int main(void)
{
int phone_numbers[ARRAY_SIZE], counter, printer;
for (counter = 1; counter <= ARRAY_SIZE; counter++)
{
do {
printf("Enter %d phone number: ", counter);
scanf("%d", &phone_numbers[counter]);
if (phone_numbers[counter] < 0 || phone_numbers[counter] > 9)
{
printf("Incorrenct data input\n");
printf("Please try again\n");
}
} while (phone_numbers[counter] < 0 || phone_numbers[counter] > 9);
}
for (printer = 1; printer <= counter; printer++)
{
switch(phone_numbers[printer])
{
case 0: case 1:
{
printf("<space>\n");
break;
}
case 2:
{
printf("abc bac cab\n");
break;
}
case 3:
{
printf("cde dec ced\n");
break;
}
....
}
}
return 0;
}
Author says I must have four nested loops. So as a beginner I must ask for help from experienced programmers.
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LEARN ABOUT PLAN9
crypt_unix
crypt_unix(5) Standards, Environments, and Macros crypt_unix(5)NAME
crypt_unix - traditional UNIX crypt algorithm
DESCRIPTION
The crypt_unix algorithm is the traditional UNIX crypt algorithm. It is not considered sufficiently secure for current systems and is pro-
vided for backwards compatibility. The crypt_sunmd5(5), crypt_bsdmd5(5), or crypt_bsdbf(5) algorithm should be used instead.
The algorithm identifier for policy.conf(4) is __unix__. There is no entry in crypt.conf(4) for this algorithm.
The crypt_unix algorithm is internal to libc and provides the string encoding function used by crypt(3C) when the first character of the
salt is not a "$".
This algorithm is based on a one-way encryption algorithm with variations intended (among other things) to frustrate use of hardware imple-
mentations of a key search. Only the first eight characters of the key passed to crypt() are used with this algorithm; the rest are
silently ignored. The salt is a two-character string chosen from the set [a-zA-Z0-9./]. This string is used to perturb the hashing algo-
rithm in one of 4096 different ways.
The maximum password length for crypt_unix is 8 characters.
USAGE
The return value of the crypt_unix algorithm might not be portable among standard-conforming systems. See standards(5).
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|MT-Level |Safe |
+-----------------------------+-----------------------------+
SEE ALSO passwd(1), crypt(3C), crypt_genhash_impl(3C), crypt_gensalt(3C), crypt_gensalt_impl(3C), getpassphrase(3C), crypt.conf(4), passwd(4), pol-
icy.conf(4), attributes(5), crypt_bsdbf(5), crypt_bsdmd5(5), crypt_sunmd5(5), standards(5)SunOS 5.10 6 Aug 2003 crypt_unix(5)
05-09-2011
