#include <iostream>
using namespace std;
 
int main()
{
//variable declarations
char package;
int hours;
double costA = 9.95, costB = 14.95, costC = 19.95;
 
cout << "Which package does the customer use (A, B, or C,)? ";
cin >> package;
cout << "How many hours did the customer use last month? ";
cin >> hours;
 
if ((hours < 0)||(hours > 744))
{
cout << "ERROR!\n"
<< "Enter a number from 0 through 744 for hours used.\n"
<< "Please re-enter hours used: ";
cin >> hours;
}
 
cout.setf(ios::fixed);
cout.setf(ios::showpoint);
cout.precision(2);
 
switch (package)
{
case 'a':
case 'A': 
if (hours <= 10)
costA = 9.95; 
else if (hours > 10)
costA = (2.00 *(hours - 10) + (costA));
cout << "The charges are $" << costA << endl; 
if ((costA > 14.95)||(costA > 19.95))
costB = (1.00 *(hours - 20) + (costB));
costB = costA - costB; 
cout << "By switching to Package B you would save $"
<< costB << endl;
costC = costA - costC;
cout << "By switching to Package C you would save $"
<< costC << endl;
break; 
case 'B':
case 'b': 
if (hours <= 20)
costB = 14.95; 
else if (hours > 20)
costB = (1.00 *(hours - 20) + (costB));
cout << "The charges are $" << costB << endl;
if (costB > 19.95)
costB = costB - costC;
cout << "By switching to Package C you would save $"
<< costB << endl; 
break; 
case 'C':
case 'c': 
if (hours <= 744)
costC = 19.95;
cout << "The charges are $" << costC << endl;
break; 
default:
cout << "Enter only A, B, or C for the package.\n"
<< "Please re-enter package: ";
cin >> package; 
}
 
return 0;
}

case 'a':
case 'A':...

case ('a'||'A'):...

case 1: