Question

C++

Download the attached program and complete the functions. (Refer to comments)

main.cpp ~

#include 
#include 

#define END_OF_LIST -999

using namespace std;

/*
 * 
 */

int exercise_1() {
    int x = 100; 
    int *ptr; 
    
    // Assign the pointer variable, ptr, to the address of x. Then print out 
    // the 'value' of x and the 'address' of x.    (See Program 10-2) 
    
    return 0; 
}

int exercise_2() {
    int x = 100; 
    int *ptr; 
    
    // Assign ptr to the address of x. Then use indirection to print out the 
    // value of x using pointer variable. (See Program 10-3) 
    
    return 0;
}

int exercise_3() {
    int a[] = {1,2,3,4,5,6,7,8,9};
    int *n; 
    
    // Print the address of the array a, 
    
    // Notice that printing the address of an array is different then printing
    // the address of a variable. 
    
    // Assign the address of the array to the variable n. Then de-reference n 
    // to print out the first, third and fifth elements. (See Programs 10-5 and 
    // 10-6)
 
    return 0;
}

int exercise_4() {

    int a[] = {1,2,3,4,5,6,7,8,9};
    int *n; 
      
    // Assign the address of the array to the variable n. Then use a loop to 
    // print out each element using a while loop (See Program 10-9)
 
    for (int i=0; i<9; i++) {
        cout << "Element " << i << " is " << "... " << endl;
    }
    return 0;
}



int main() {
    exercise_1();
    exercise_2();
    exercise_3();
    exercise_4();
}

Answer 1

#include <iostream>

#define END_OF_LIST -999

using namespace std;

/*
*
*/

int exercise_1() {
int x = 100;
int *ptr;
  
// Assign the pointer variable, ptr, to the address of x. Then print out
// the 'value' of x and the 'address' of x. (See Program 10-2)
ptr = &x;
cout<<"Value of x: "<<x<<"\nAddress of x: "<<&x;
  
return 0;
}

int exercise_2() {
int x = 100;
int *ptr;
  
// Assign ptr to the address of x. Then use indirection to print out the
// value of x using pointer variable. (See Program 10-3)
ptr = &x;
cout<<"\nValue of x using pointer variable: "<<*ptr;
  
return 0;
}

int exercise_3() {
int a[] = {1,2,3,4,5,6,7,8,9};
int *n;
  
// Print the address of the array a,
cout<<"\nAddress of array a: "<<a;
  
// Notice that printing the address of an array is different then printing
// the address of a variable.
  
// Assign the address of the array to the variable n. Then de-reference n
// to print out the first, third and fifth elements. (See Programs 10-5 and
// 10-6)
n= a;
cout<<"\n1st, third, fifth array elements: "<<*n<<","<<*(n+2)<<","<<*(n+4);
return 0;
}

int exercise_4() {

int a[] = {1,2,3,4,5,6,7,8,9};
int *n;
  
// Assign the address of the array to the variable n. Then use a loop to
// print out each element using a while loop (See Program 10-9)
n=a;
for (int i=0; i<9; i++) {
cout << "\nElement " << i << " is " << "... " ;
cout<<*(n+i);
}
return 0;
}

int main() {
exercise_1();
exercise_2();
exercise_3();
exercise_4();
}

output:

Value of x: 100
Address of x: 0x7fff404780b4
Value of x using pointer variable: 100
Address of array a: 0x7fff40478080
1st, third, fifth array elements: 1,3,5
Element 0 is ... 1
Element 1 is ... 2
Element 2 is ... 3
Element 3 is ... 4
Element 4 is ... 5
Element 5 is ... 6
Element 6 is ... 7
Element 7 is ... 8
Element 8 is ... 9