Question

In C programming language,

1. Use Bitwise operations to do the operations below. Assume all variables are unsigned char (1 byte).
   1. Change variable x so that its 2 right-most bits become 0.
   2. Change the variable x so that its 2 left-most bits become 1.
   3. Rotate variable x to the right by 3 bits.
   4. x = y *4;
   5. x = y / 4;

Answer 1

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#include <stdio.h>
int main()
{
unsigned char x;
x=123;
// x= 01111011 in binary
x= (x >>2)<<2;
printf("%d\n",(int)x);
// cout<<(int)x<<endl;
// binary representaion of 120 is 01111000
x= 123;
x= x|(3<<6);
// (33<<6) = 11 left shifted 6 times which gives 11000000
printf("%d\n",(int)x);
// cout<<(int)x<<endl;
//251 = 11111011 in binary
x=7;
x=(x >> 3)|(x << (8 - 3));
printf("%d\n",(int)x);
// cout<<(int)x<<endl;
//224= 11100000
int y=6;
x= y<<2;// y*4
x= y/4;// y/4
return 0;
}