C++ Gurus - What Am I Doing Wrong?

[ARCHIVED THREAD] - C++ Gurus - What Am I Doing Wrong?

Posted: 3/13/2006 8:16:45 PM EDT

My brain is fried so here's a stupid question. I'm simply trying to display a number in binary form using setbase. Here's all it is.

int val = 0;
cout << "Enter a number: ";
cin >> val;

cout << setbase(2) << val << setbase(10) << endl;

The first setbase command sets the base to 2 (presumably to display the number as binary) and the second setbase command converts the base back to 10, since its not needed beyond displaying the number.

All I get spit back out at me is the number I enter is regular integer form, not in binary.

What am I doing wrong?

Sorry, brain is toast and can't figure out wtf is going on.

Posted: 3/13/2006 8:18:43 PM EDT

[#1]

Posted: 3/13/2006 8:25:21 PM EDT

[#2]

From a quick search, I think that setbase() can only take values 8, 10, or 16.

Posted: 3/13/2006 8:27:33 PM EDT

[#3]

Quoted:
From a quick search, I think that setbase() can only take values 8, 10, or 16.

Now that could certainly be the problem.

I wish I had the help program properly installed on my C++ compiler.

Posted: 3/13/2006 8:28:05 PM EDT

[#4]

It's been awhile since I messed with C++ but I don't think setbase does binary.

Posted: 3/13/2006 8:36:48 PM EDT

[#5]

Hmm....my professor seemed to imply there was some lovely little function you ran an integer through and it spit out a binary number.....perhaps such a thing does not exist. I have been unable to get a clear answer of it off of google.......

Posted: 3/13/2006 8:39:43 PM EDT

[#6]

bah, nm........already mentioned, left the computer for too long

Posted: 3/13/2006 8:44:05 PM EDT

[#7]

There is no simple way to print out the binary form of an integer in C++. You need to write your own function like this one (found online) that takes in an integer and returns a string of the bits:

private string ToBinary(Int64 Decimal)

{

// Declare a few variables we're going to need

Int64 BinaryHolder;

char[] BinaryArray;

string BinaryResult = "";

while (Decimal > 0)

{

BinaryHolder = Decimal % 2;

BinaryResult += BinaryHolder;

Decimal = Decimal / 2;

}

// The algoritm gives us the binary number in reverse order (mirrored)

// We store it in an array so that we can reverse it back to normal

BinaryArray = BinaryResult.ToCharArray();

Array.Reverse(BinaryArray);

BinaryResult = new string(BinaryArray);

return BinaryResult;

}

This is starting to bring back bad memories of my computer science classes. Luckily, I will escape with a degree this May!

Posted: 3/13/2006 8:46:25 PM EDT

[#8]

itoa() ??

Posted: 3/13/2006 8:52:18 PM EDT

[#9]

Quoted:
There is no simple way to print out the binary form of an integer in C++. You need to write your own function like this one (found online) that takes in an integer and returns a string of the bits:

private string ToBinary(Int64 Decimal)

{

// Declare a few variables we're going to need

Int64 BinaryHolder;

char[] BinaryArray;

string BinaryResult = "";

while (Decimal > 0)

{

BinaryHolder = Decimal % 2;

BinaryResult += BinaryHolder;

Decimal = Decimal / 2;

}

// The algoritm gives us the binary number in reverse order (mirrored)

// We store it in an array so that we can reverse it back to normal

BinaryArray = BinaryResult.ToCharArray();

Array.Reverse(BinaryArray);

BinaryResult = new string(BinaryArray);

return BinaryResult;

}

This is starting to bring back bad memories of my computer science classes. Luckily, I will escape with a degree this May!

Think that's bad, I had to write a program that did it in assembly last sememster.

Posted: 3/13/2006 8:55:31 PM EDT

[#10]

Quoted:
itoa() ??

Damn, forgot all about that.

Posted: 3/13/2006 8:57:57 PM EDT

[#11]

Quoted:
Quoted:
There is no simple way to print out the binary form of an integer in C++. You need to write your own function like this one (found online) that takes in an integer and returns a string of the bits:

private string ToBinary(Int64 Decimal)

{

// Declare a few variables we're going to need

Int64 BinaryHolder;

char[] BinaryArray;

string BinaryResult = "";

while (Decimal > 0)

{

BinaryHolder = Decimal % 2;

BinaryResult += BinaryHolder;

Decimal = Decimal / 2;

}

// The algoritm gives us the binary number in reverse order (mirrored)

// We store it in an array so that we can reverse it back to normal

BinaryArray = BinaryResult.ToCharArray();

Array.Reverse(BinaryArray);

BinaryResult = new string(BinaryArray);

return BinaryResult;

}

This is starting to bring back bad memories of my computer science classes. Luckily, I will escape with a degree this May!

Think that's bad, I had to write a program that did it in assembly last sememster.

pfft, this semester I'm doing a group project involving writing a standalone operating system. Writing device drivers and messing with control registers

.

Assembly I would think would be easy because you could just rotate through the carry and print a 1 if the carry bit is set 0 if not. Simple.

Posted: 3/13/2006 9:07:04 PM EDT

[#12]

Try this maybe?

int val = 0;
cout << "Enter a number: ";
cin >> val;

setbase(2)
cout << val << endl;
setbase(10)

Posted: 3/13/2006 9:09:41 PM EDT

[#13]

Quoted:
Assembly I would think would be easy because you could just rotate through the carry and print a 1 if the carry bit is set 0 if not. Simple.

Basically. I forgot though, it was hex to binary.

ORG $1000
HEX_IN FDB $F23C
DEC_WTS FDB 10000,1000,100,10,1

ORG $1010
DEC_OUT FCC "00000"
*******************************

ORG $2000

LDY #DEC_OUT ;point to the ascii array
LDX #DEC_WTS ;point to the array
LDD HEX_IN ;load the number being converted
START CPD #$0000 ;compare to zero
BEQ FIN ;if = to zero, we're done
CLC ;clear the c bit
INC 0,Y ;increment the ascii array
SUBD 0,X ;subtract the number being pointed to from the number being converted
BCS FIX ;if there is a carry, we went to far so go fix it
BCC START ;if there is no carry, do it again

FIN SWI ;done

**********************************

FIX ADDD 0,X ;add the last number subtracted back
DEC 0,Y ;decrement the ascii array
INX ;increment x to point to the next number to sutract
INX
INY ;increment y to the next poition
BRA START ;go subtract

and I guess it wasn't as bad as I remembered it.

ETA: we need CODE tags.

Posted: 3/13/2006 9:14:38 PM EDT

[#14]

Quoted:
Hmm....my professor seemed to imply there was some lovely little function you ran an integer through and it spit out a binary number......

Oh it exists...

String Integer.toBinaryString(int i);

[ARCHIVED THREAD] - C++ Gurus - What Am I Doing Wrong?

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