Explanation of Solution
The program execution is explained in the in-lined comments:
#include <iostream>
#include <iomanip>
using namespace std;
int main()
{
//declare pointer variables and allocate memory
double *trip1Cost = new double;
double *trip2Cost = new double;
double *trip3Cost = new double;
double *max;
//store values in the allocated memory
*trip1Cost = 100.00;
*trip2Cost = 350.00;
//assign pointer variables to each other
//trip3Cost now points to location having
//stored 350.00 later trip2Cost points
//to location having a stored value 100.00
trip3Cost = trip2Cost;
trip2Cost = trip1Cost;
//trip1Cost is now pointed to freshly allocated
//memory location and assigned value
trip1Cost = new double;
//trip1Cost points to a location having
//stored value of 175 and trip3Cost now
//points to a location having a stored value 275
*trip1Cost = 175;
*trip3Cost = 275;
//sets the output format
cout << fixed << showpoint << setprecision(2);
//prints the arithmetic expression
//(*trip1Cost + *trip2Cost + *trip3Cost) which
//evaluates to (175 + 100...

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Chapter 12 Solutions
EBK MINDTAPV2.0 FOR MALIK'S C++ PROGRAM
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