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Check digit in number

 
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Check digit in number
Meldra
26 Nov, 2008 - 04:43 PM
Post #1

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Joined: 23 Nov, 2008
Posts: 7
Hi all,
I’m new to C++ and programming in general.
I have to write a program that convert a number (taken from user) from base number b=2, b=4, b=5, b=8 to decimal number .
My question is how can I check if given number is valid for convertation. For example,
Input:
21
Output:
From b=2 - not binary number;
From b=4 9
From b=5 11
From b=8 17.

Any suggestions are welcomed.
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KYA
RE: Check Digit In Number
26 Nov, 2008 - 06:06 PM
Post #2

#include <nerd.h>
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My Contributions
Half ass way: Check if the number only has ones and zeros, fails on numbers such as 10, 101, etc... but that can be accommodated

Better way: Define a isBinary() function to test if the number is an assembly of ones and zeros, i.e. base 2. You would probably have to do this for each base, so it won't be a blanket solution for the program. The real key to this problem isn't checking for conversion but the understanding of all the various bases and their relationships with one another.


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Meldra
RE: Check Digit In Number
30 Nov, 2008 - 01:11 PM
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Thank you for reply.
I got my program work. It wasn't so hard as it seemed.
I used this function for checking.
CODE

int check (int a, int d)//a given number, d digits from 9 to 1
{              
    int y;
    do
    {
            y=a%10;
            if (y==d) return y;
            else a /=10;
            }while (a > 0);
            return y;
}


This post has been edited by Meldra: 30 Nov, 2008 - 01:12 PM
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