Example 1:

#include <stdio.h>

int main()
{
    int a;

    // Note: a++ is a shortcut for "a = a + 1"

    for (a = 0; a < 16; a++)
    {
        printf("a has the value %d (or 0x%x)\n", a, a);
    }

    return 0;
}

        

Example 2:

#include <stdio.h>
#include <stdint.h>  // needed for uint8_t definition

int main()
{
    uint8_t var;
    uint8_t shifted_var;

    var = 0x6e;

    shifted_var = (var >> 1);
    printf("var shifted right 1 bit is 0x%x\n", shifted_var);

    shifted_var = (var << 2);
    printf("var shifted left 2 bits is 0x%x\n", shifted_var);

    return 0;
}

Example 3:

#include <stdio.h>
#include <stdint.h>  // needed for uint8_t definition

int main()
{
    /* Pretend reg has the following bits:
        7    6    5    4    3    2    1    0
       PR3  PR2  PR1  PR0  AR1  AR0  SB1   SB0
 value: 1    1    0    1    0    1    0    1 */

    uint8_t reg = 0xd5;
    uint8_t ar_bits;

    // Let's try to extract AR1 and AR0...

    ar_bits = (reg & 0x0c);
    ar_bits = ar_bits >> 2;
    printf("AR bits are 0x%x\n", ar_bits);

    return 0;
}