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Join Date: Apr 2004

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Transworld Transworld is offline

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decimal > binary > Oct > Hex

Sep 12th, 2004

Would I have to go about doing the math manually and make my own function? Is there some built in function I can use to be lazy? Is there some totally easier way that I am oblivious to?

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alc6379

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Re: decimal > binary > Oct > Hex

Sep 12th, 2004

I found this link, which you could use to do the decimal to hex number.

But, I'd imagine somewhere there's bound to be some kind of library function that could do this for you... Have you searched Google for it yet?

Alex Cavnar, aka alc6379

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Dave Sinkula Dave Sinkula is offline

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long time no c

Re: decimal > binary > Oct > Hex

Sep 12th, 2004

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Originally Posted by Transworld

Would I have to go about doing the math manually and make my own function? Is there some built in function I can use to be lazy? Is there some totally easier way that I am oblivious to?

I will assume you mean you would like to display the value of some integral type in decimal, binary, octal, and hexadecimal representations. Three out of four are available the lazy way, but you'll need to roll your own to display a binary representation.

 Help with Code Tags 
 C++ Syntax (Toggle Plain Text) 
#include <iostream> 
 
 template < typename T >
 inline T highbit(T& t)
 {
    return t = (((T)(-1)) >> 1) + 1;
 }
 
 template < typename T >
 std::ostream& bin(T& value, std::ostream &o)
 {
    for ( T bit = highbit(bit); bit; bit >>= 1 )
    {
 	  o << ( ( value & bit ) ? '1' : '0' );
    }
    return o;
 }
 
 
 int main() 
 {
    unsigned long value = 0x12345678;
    std::cout << "hex: " << std::hex << value << std::endl;
    std::cout << "dec: " << std::dec << value << std::endl;
    std::cout << "oct: " << std::oct << value << std::endl;
    std::cout << "bin: ";
    bin(value, std::cout);
    std::cout << std::endl;
    return 0; 
 }
 
 /* my output
 hex: 12345678
 dec: 305419896
 oct: 2215053170
 bin: 00010010001101000101011001111000
 */
#include <iostream> 
 
 template < typename T >
 inline T highbit(T& t)
 {
    return t = (((T)(-1)) >> 1) + 1;
 }
 
 template < typename T >
 std::ostream& bin(T& value, std::ostream &o)
 {
    for ( T bit = highbit(bit); bit; bit >>= 1 )
    {
 	  o << ( ( value & bit ) ? '1' : '0' );
    }
    return o;
 }
 
 
 int main() 
 {
    unsigned long value = 0x12345678;
    std::cout << "hex: " << std::hex << value << std::endl;
    std::cout << "dec: " << std::dec << value << std::endl;
    std::cout << "oct: " << std::oct << value << std::endl;
    std::cout << "bin: ";
    bin(value, std::cout);
    std::cout << std::endl;
    return 0; 
 }
 
 /* my output
 hex: 12345678
 dec: 305419896
 oct: 2215053170
 bin: 00010010001101000101011001111000
 */

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