CODEWITHSUNDEEP
cbit-manipulationbitwise-operators
devoidfeast
devoidfeast

Reputation: 857

How to break a byte into 4 pairs of 2 bits

I wonder how can I break a byte in 4 pairs of two bits.

E.g. I am given the following:

0xf0;    /* 11110000 */

and the output should be:

11
11
00
00

Upvotes: 1

Views: 1001

Answers (2)

Minion91
Minion91

Reputation: 1929

you should check out the bitwise operations. They provide everything you need.

bitwise & for masking

0xf0 & 0b11000000 = 0b11000000

bit shift >>

0b11000000 >> 6 = 0b00000011

edit:

0b00000011 = (0xf0 & 0b11000000) >> 6;
0b00000011 = (0xf0 & 0b00110000) >> 4;
0b00000000 = (0xf0 & 0b00001100) >> 2;
0b00000000 = 0xf0 & 0b00000011;

Upvotes: 4

Vaughn Cato
Vaughn Cato

Reputation: 64308

void printBits(int byte)
{
  printf("%d%d\n",byte>>7,(byte>>6)&1);
  printf("%d%d\n",(byte>>5)&1,(byte>>4)&1);
  printf("%d%d\n",(byte>>3)&1,(byte>>2)&1);
  printf("%d%d\n",(byte>>1)&1,byte&1);
}

Upvotes: 1

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