how do I shift bits

[Onceler]

I need a program that can count by changing the digits in a binary file example:
1111 1111 to 1111 1110 then 1111 1101 then 1111 1011
How could I do this?

[EricDu]

1111 1111 to 1111 1110 then 1111 1101 then 1111 1011

What result you want to see with this example?

[Onceler]

I mean shift 1111 1111 to 1111 1110 then it to 1111 1101 then to 1111 1011...etc.

[zb0S216C]

Have you ever heard of bit manipulation? It's only one of the most best features of C++, in my opinion. Here are some operations:

char Flags( 0x3 );

// Remove a bit:
Flags &= ~( 0x1 );

// Add a bit:
Flags |= ( 0x1 );

// Test a bit:
if( Flags &( 0x1 ) ) { ... }

// Toggle a bit
Flags ^= ( 0x1 );

// Shift left:
Flags <<= 2;

// Shift right:
Flags >>= 2;

Edited in response to Disch's post :) Thanks for pointing them out, Disch.

_Wazzak

[Disch]

fixed:

char Flags( 0x3 );

// Remove a bit:
Flags &= ~( 0x1 );

// Add a bit:
Flags |= ( 0x1 );

// Test a bit:
if( Flags &( 0x1 ) ) { ... }

// Toggle a bit
Flags ^= ( 0x1 );

// Shift left:
Flags <<= 2;

// Shift right:
Flags >>= 2;
 

[ascii]

In your case you'll want to use a combination of the << operator and the & operator. If you can get a bit that looks like this:

1111 1110 

And & that bit with your number, you should get the desired result. You'll then need to shift the bit mentioned above to make it:

1111 1101

And repeat the process.

[Onceler]

Thanks you all.