Question

In this assignment, you must complete
the 5 functons below. Each function's body
must consist of just a single C statement.
Furthermore, the statement must not be a control
statement, such as if, switch, or any kind of loop.
For each problem, you are also restricted to the
operators and constants as specified.
*/

/* 1. Write a function which zeros a variable x. A
pointer to x is passed as a parameter. YOU MAY
USE NO CONSTANTS in this function, and must
restrict yourself to using the assignment operator,
the dereferencing operator, and one or more of
the bitwise operators.
*/

void zero(int *xptr) {

}

/* 2. Write a function to set x to be the maximum unsigned long
integer. The parameter passed to the function is a
pointer to x. You may only use the constant 0 in
this function, and must restrict yourself to using
the assignment operator, the dereferencing operator,
and the bitwise operators.
*/

void maximum(unsigned long *xptr) {

}

/* 3. Write a function to set x to be the minimum long
integer. The parameter passed to the function is a
pointer to x. You may only use the constants 0-63 in
this function, and must restrict yourself to using
the assignment operator, the dereferencing operator,
the bitwise operators, and the shift operators.
*/

void minimum(long *xptr) {

}

/* 4. Write a function which sets the integer x to negative x.
The parameter passed to the function is a pointer to x.
You may only use the constant 1 in this function,
and must restrict yourself to the assignment operator,
the dereferencing operator, the bitwise operators, and
the + operator.
*/

void negative(int *xptr) {

}

/* 5. Write a function called set_byte. It is passed 3
parameters: a pointer to an unsigned integer x, an
index i, and a new value v for the byte.
The function should change the ith byte of x to
v. Byte 0 is x's least significant byte; byte 1
is the next least significant byte, etc.; byte 3
is x's most significant byte. You may only use the
constants 0-4 in this function, and must restrict
yourself to the the assignment operator, the
dereferencing operator, multiplication, bitwise
operators and shift operators.
*/

void set_byte(unsigned int *xptr, int i, char v) {

}

int main() {
int x;
int *xptr = &x;
long l;
long *lptr = &l;
unsigned long ul;
unsigned long *ulptr = &ul;

zero(xptr);
printf("zero %d\n", x);
maximum(ulptr);
printf("max %#lx %lu\n", ul, ul);
minimum(lptr);
printf("min %#lx %ld\n", l, l);
x = 3;
negative(xptr);
printf("negative %d\n", x);
x = 15;
set_byte(xptr, 2, 15);
printf("%#x\n", x);
}

Answer 1