Function definition for "leftmost_one()" function:

The implementation for "leftmost_one()" function is given below:

//Header file

#include <stdio.h>

#include <assert.h>

//Function definition for leftmost_one

int leftmost_one(unsigned x)

{

/* First, create a mask that each bit after leftmost "1" are "1". Generate a mask using bitwise inclusive OR and assignment operator.*/

//Here value of "x" means x = x | (x >> 1)

x |= x >> 1;

//Here value of "x" means x = x | (x >> 2)

x |= x >> 2;

//Here value of "x" means x = x | (x >> 4)

x |= x >> 4;

//Here value of "x" means x = x | (x >> 8)

x |= x >> 8;

//Here value of "x" means x = x | (x >> 16)

x |= x >> 16;

/* Finally perform "(mask >> 1) + (mask && 1)" which means "mask && 1" assigns with case "x" is "0" */

return (x >> 1) + (x && 1);

}

//Main function

int main(int argc, char* argv[])

{

/* Call leftmost_one with checking value using assert function */

assert(leftmost_one(0xFF00) == 0x8000);

/* Call leftmost_one with checking value using assert function. */

assert(leftmost_one(0x6000) == 0x4000);

/* Call leftmost_one with checking value using assert function. */

assert(leftmost_one(0x0) == 0x0);

/* Call leftmost_one with checking value for 32-bit using assert function...