Thread: Hi there I'm new beginner. Decimal/Octal converter help/

I downloaded this code from some site after a search. As you can see it has a limit(295600127). Why? is there a mistake in the code. . anyways I want to make it work correctly. With someones help of course. Basically explail what is going on below the first return 0;

Code:

/*295600127currentlimit*/



#include <stdio.h>
#include <math.h>




int convertDecimalToOctal(int decimalNumber);
int main()
{
int decimalNumber;




printf("Enter a decimal number: ");
scanf("%d", &decimalNumber);




printf("%d in decimal = %d in octal", decimalNumber, convertDecimalToOctal(decimalNumber));




return 0;
}




int convertDecimalToOctal(int decimalNumber)
{
int octalNumber = 0, i = 1;




while (decimalNumber != 0)
{


octalNumber += (decimalNumber % 8) * i;
decimalNumber /= 8;
i *= 10;
}




return octalNumber;
}

Just to prove i'm a beginner this is my own dec/oct converter:
It would only do up 2147483647 until I figured out to unsign my int's
I guess I can't wordwrap my code huh?

Code:

/*decimal_octal_converter*/



#include <stdio.h>
/*---------------*/




unsigned int dec, oct;




int main(void)




{
printf("Enter a number between 0 and 4294967295: ");
scanf ("%d", &dec);








printf("Octal value: %d%d%d%d%d%d%d%d%d%d%d", dec/(8*8*8*8*8*8*8*8*8*8), dec%(8*8*8*8*8*8*8*8*8*8)/(8*8*8*8*8*8*8*8*8), dec%(8*8*8*8*8*8*8*8*8)/(8*8*8*8*8*8*8*8), dec%(8*8*8*8*8*8*8*8)/(8*8*8*8*8*8*8), dec%(8*8*8*8*8*8*8)/(8*8*8*8*8*8), dec%(8*8*8*8*8*8)/(8*8*8*8*8), dec%(8*8*8*8*8)/(8*8*8*8), dec%(8*8*8*8)/(8*8*8), dec%(8*8*8)/(8*8), dec%(8*8*8)%(8*8)/8, dec%8);




return 0;
}

And this is the easiest one:
It took me a while to learn that %o means substitute the decimal number with it's equivalent octal value. In fact if yoy replace the o with an x it wil give the hex value. I couldn't figure out how just modulus%ozero could do all that figuring. Obviously I now know that's not a zero but an "o".

Code:

/* C Program to Convert Decimal to Octal Number */



#include <stdio.h>
int main()
{
int number;
printf("\n Please Enter the Number You want to Convert : ");
scanf("%d", &number);




printf("\n Octal Number of a Given Number = %o", number);




return 0;
}

> As you can see it has a limit(295600127). Why? is there a mistake in the code.
Because it's faking it by storing only digits 0 through 7 in an otherwise decimal integer.

295600127 decimal is 2147477777 octal.
But the first code just stores it in a decimal integer (that's the %d format), and that's close to the max decimal value of 2147483647

> I guess I can't wordwrap my code huh?
You can add newlines almost anywhere you can use space.

Code:

printf("Octal value: %d%d%d%d%d%d%d%d%d%d%d", 
    dec/(8*8*8*8*8*8*8*8*8*8), 
    dec%(8*8*8*8*8*8*8*8*8*8)/(8*8*8*8*8*8*8*8*8), 
    dec%(8*8*8*8*8*8*8*8*8)/(8*8*8*8*8*8*8*8), 
    dec%(8*8*8*8*8*8*8*8)/(8*8*8*8*8*8*8), 
    dec%(8*8*8*8*8*8*8)/(8*8*8*8*8*8), 
    dec%(8*8*8*8*8*8)/(8*8*8*8*8), 
    dec%(8*8*8*8*8)/(8*8*8*8), 
    dec%(8*8*8*8)/(8*8*8), 
    dec%(8*8*8)/(8*8), 
    dec%(8*8*8)%(8*8)/8, 
    dec%8);