
Explanation of Solution
The program has been explained in the in-lined comments:
#include <iostream>
using namespace std;
int main()
{
//delcare a list and initialize it
//with an array of 6 elements
int numList[6] = {25, 37, 62, 78, 92, 13};
//create a pointer to the list -
//the base address of the list is assigned
//to the pointer
int *listPtr = numList;
//a new pointer is declared and is assigned
//an address 2 int positions incremented i.e
//it points to the 3rd position in the array
//or numlist[2] which is the value 62
int *temp = listPtr + 2;
//declare an int variable
int num;
//assign value of the memory address pointed to
//by listPtr with the arithmetic expression on the
//RHS of the assignment operator
//RHS = *(listPtr + 1) - *listPtr =
//numList[1] - numList[0] = 37-25 = 12
//since listPtr is numList[0] so now the array elements
//are {12, 37, 62, 78, 92, 13}
*listPtr = *(listPtr + 1) - *listPtr;
//listPtr is incremented and now points to numList[1]
// i.e. 37
listPtr++;
//num is assigned the value pointed to by temp which is
//numList[2] i.e. 62
num = *temp;
//temp is incrementedand now points to numList[3]
//i...

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Chapter 12 Solutions
C++ Programming: From Problem Analysis to Program Design
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