C++ Programming: From Problem Analysis to Program Design
C++ Programming: From Problem Analysis to Program Design
8th Edition
ISBN: 9781337102087
Author: D. S. Malik
Publisher: Cengage Learning
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Chapter 12, Problem 17SA

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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