I am not getting the byte values? - c

Question

I'm not able to get the right output when I do the following code. look at the comments for what I'm trying to print.
I did the code based on what I've been learning so far, but I'm still not getting the right output.
So any suggestions? What have I done, so I'm able to fix the problem.
When I print(A), I'm not getting 0100 0001, but it prints 49d or 49 sometimes
#include <stdio.h>
unsigned char getBit(unsigned char c, int n)
{
return ((c & (1 << n)) >> n);
}
unsigned char setBit(unsigned char c, int n)
{
c = c | (1 << n);
return c;
}
unsigned char clearBit(unsigned char c, int n)
{
c = c & (~(1 << n));
return c;
}
void printBits(unsigned char c)
{
printf("The bit of the character you inputed is %x \n", c);
}
int main(void)
{
unsigned char a = 'A';
printBits(a);
putchar('\n');
a = setBit(a, 2);
a = setBit(a, 3);
printBits(a); //should print 0100 0001, but it prints 49
putchar('\n');
a = clearBit(a, 2);
printBits(a);
putchar('\n');
}

Answer 1

Your current solution prints the value of c as a hexadecimal number using printf(). Since there is no printf format specifier to print a number in binary representation, we'll have to write our own solution.
#include <limits.h>
#include <stdio.h>
void printBits(byte c)
{
for (unsigned i = CHAR_BIT; i;) { // count from the with of a char
// in bits down to 1
putchar(c & 1 << --i // test the i-th bit (1-based)
? '1' // if true (different form 0) evaluates to '1'
: '0' // else evaluates to '0'
);
if (CHAR_BIT == 8 && i % 4 == 0) // if we use 8-bit-bytes and just
// finished printing the higher nibble
putchar(' '); // insert a seperator between the nibbles
}
}
... ftw!
No-nonsense version:
void printBits(byte c)
{
for (unsigned i = CHAR_BIT; i;) {
putchar(c & 1 << --i ? '1' : '0');
if (CHAR_BIT == 8 && !(i % 4))
putchar(' ');
}
}
`
unsigned char a = 'A';
printBits(a); // should print 0100 0001
putchar('\n');
a = setBit(a, 2);
a = setBit(a, 3);
printBits(a); // should print 0100 1101
putchar('\n');
a = clearBit(a, 2);
printBits(a); // should print 0100 1001
putchar('\n'