C Program to reverse bits in character, integer; function to print bits of a character integer

#include<stdio.h>

void printBits(unsigned int num)

{

        char bit =0;

        for(bit=0;bit<(sizeof(unsigned char) * 8); bit++)

        {

 
        printf("%d ", num & 0x01);

          num = num >> 1;

        }

        printf("\n\n");

}

int main()

{

  unsigned char n = 0x07;

  unsigned char r = 0x00;

  unsigned char m = 0x01;

  unsigned char i = 0;

  printBits(n);

  for (i=0; i<sizeof(char)*8; i++)

  {

          r = r|( (n&m)  << (sizeof(char)*8-1) -i);

          n=n>>1;

  }

printBits(r);

printf("\n\n reverse =%d",r);

}