can be done by reversing the bits

#include<stdio.h>
#include<conio.h>

int main()
{
	int i,number,count=0,a[100];

	printf("Enter the number\n");
	scanf("%d",&number);

	for(i=7;i>=0;i--)
	{
        if((1<<i) & number)
			a[count] = 1;
		else
			a[count] = 0;
		
		count++;
	}

	printf("Binary Value of the Given Number is:\n");
	for(i=0;i<=7;i++)
	{
		printf("%d",a[i]);
	}
	printf("\nReversed Binary Value of the Given Number is:\n");
	for(i=0;i<=7;i++)
	{
		printf("%d",a[7-i]);
	}
	printf("\n");
}

You can swap swap bits using two ways
1 ) with for loop
2 ) using recursion

#include <stdio.h>

char swap_bits_in_byte ( unsigned char byte_2_swap )
{
	unsigned char swapped_byte = 0;
	int nloop = 0;
	for( nloop = 0; nloop < 8; ++nloop ) { 
		swapped_byte = swapped_byte << 1;
		swapped_byte |= ( byte_2_swap & 1 );
		byte_2_swap = byte_2_swap >> 1;
	}
	return ( swapped_byte );
}


unsigned char swap_bits ( unsigned char byte_2_swap, int 
n_size )
{
	unsigned char swapped_byte = 0;
	int bits = ( ( sizeof ( unsigned char ) * 8 ) - 1 );

	if ( bits == n_size ) {
		swapped_byte = ( byte_2_swap 
				& (unsigned char) ( pow ( 
2, n_size ) ) ) 
			? ( 1 << ( bits - n_size ) ) : 0;
	} else {
		swapped_byte = swap_bits ( byte_2_swap, 
n_size + 1 );
		swapped_byte |= ( byte_2_swap 
				& (unsigned char) ( pow ( 
2, n_size ) ) ) 
			? ( 1 << ( bits - n_size ) ) : 0;
	}
	return ( swapped_byte );
}

int main ( int argc, char* argv [] )
{
	unsigned char byte = 128 | 32;
	unsigned char swapped_byte = 0;

	swapped_byte = swap_bits_in_byte ( byte );
	printf ( "\n Un Swapped Byte :%d", byte );
	printf ( "\n Swapped Byte :%d", swapped_byte );

	swapped_byte = swap_bits ( byte, 0 );
	printf ( "\n Un Swapped Byte :%d", byte );
	printf ( "\n Swapped Byte :%d", swapped_byte );

}