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Full Discussion: Problem with simple octal to decimal code
Homework and Emergencies Homework & Coursework Questions Problem with simple octal to decimal code Post 302511028 by qf_woodfox on Tuesday 5th of April 2011 02:34:41 PM
Old 04-05-2011
Problem with simple octal to decimal code
Hello all
I started computer science and C++ programming only 6 weeks ago with no prior knowledge. It's a great language, the only other one apart from English that I hope to speak fluently quite soon. I look forward to participating further on these forums, seeking answers and looking at previous threads. Hopefully I will be able to help others later on. Let me cut to the chase.

1. The problem statement, all variables and given/known data:
Although this is an assignment question, it isn't due for a while, and I'm mainly only awake at 4:20am for the sake of it. The question asks to write a C++ program that converts a 4-digit octal number to decimal. I wrote and compiled it, but there's something wrong. I don't think it's arithmetic, because the program terminates at return 1, even if there isn't an 8 or a 9.


2. Relevant commands, code, scripts, algorithms:
Code:
#include <iostream>
using namespace std;
int main()
{
    int number = 0;
    int digit4 = 0;
    int digit3 = 0;
    int digit2 = 0;
    int digit1 = 0;
    int decimal = 0;

    cout << "Enter a four digit octal number to convert to decimal form: " << endl;
        cin >> number ;

    ( digit4 = number/1000 );
    ( digit3 = number/100 - digit4*1000 );
    ( digit2 = number/10 - digit4*1000 - digit3*100 );
    ( digit1 = number - digit4*100 - digit3*100 - digit2*10);

    cout << digit1 << digit2 << digit3 << digit4 << endl; // This was me testing each digit. 

    if (digit1 || digit2 || digit3 || digit4 == 8 || 9)
    {
        cout << "The number entered contains the digit 8 and/or 9. Please try again." << endl;
        return 1;
    } 
    if (number > 7777)
    {
        cout << "The number entered exceeds the limit for this program, please try again." << endl;
        return 2;
    }
    (decimal = digit1 + digit2*8 + digit3*64 + digit4*512);

    cout << "The entered octal number is equal to: " << decimal << "in decimal form." << endl;

return 0;
}

3. The attempts at a solution (include all code and scripts):
As you can see in the code, i checked the output of each digit. It returned a dud result.

Tried removing the if statement testing for 8s and 9s. Returned a large negative number.

Also tried other fine-tuning methods to no avail.


4. Complete Name of School (University), City (State), Country, Name of Professor, and Course Number (Link to Course):

University of Wollongong, Wollongong, Australia, Daniel Saffioti, CSCI114
 

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LEARN ABOUT DEBIAN

gbase

gbase(1)						      General Commands Manual							  gbase(1)

NAME

       gbase - small numeric base converter

SYNOPSIS

       gbase [options]

DESCRIPTION

       gbase converts numbers between bases 2 (binary), 8 (octal), 10 (decimal), 16 (hexadecimal).

       If you specify a number on the command line (preceded by a switch to describe the base the number is in) the program will display that num-
       ber in the four bases on the console and exit.
       You can also specify the -s switch which will allow you to enter/display signed numbers. (This allows the use of a - (minus) before a deci-
       mal number).

       Just  running  the program without any switches will display the main window. There are four entry boxes, corresponding to each of the four
       bases. You can type into any of these boxes and the others will update automagically. The program will ignore any characters that  are  not
       allowed for that particular base. It will only allow a - (minus) at the start of a decimal number, if the signed option is on.

OPTIONS

       --help Display a short help screen and exit

       --version
	      Print version number and exit

       -s     Treat the number as a signed value

       -d decimal number
	      Print this decimal number in all bases

       -h hex number
	      Print this hexadecimal number in all bases

       -o octal number
	      Print this octal number in all bases

       -b binary number
	      Print this binary number in all bases

AUTHOR

       gbase is Copyright (C) 1999 Damian Kramer, Roger Dunce.

gbase								    August 2003 							  gbase(1)
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