a) Modify the class JarType to include a constructor and the destructor. Additionally,

in the constructor include the following statement:

std::cout

b) In MyProg.cpp, right after jar1 is created, try the following statement:

The above line should give you a compilation error. Be sure you understand the

reason for the error. Then, comment out, the line so that your program can

compile, as follows:

// Removed the next line as it causes a compilation error

//jar1.numUnits = 10000;

c) Adjust the code in the jar's add method to guard against negative input values.

d) Expand the capabilities of the JarType to include a subtract method to accept

an input value to lower the number of units in a jar. Again, be sure to check

for negative input values.

e) Add a constructor to JarType to allow you to prefill a jar with an initial amount.

For example, in MyProg.cpp, you should be able to do the following:

JarType jar3(50);

Then, show the number of units in jar3.

Print a message when a prefilled jar is created.

Be sure to test all your changes by including an appropriate call in MyProg.cpp. For example,

jar1.add( -5000 );

f) Expand the capabilities of the class JarType so that the following statements

can be used in MyProg.cpp:

JarType jar4( 'p' ); // Prefill with 16 ounces

JarType jar5( 'q' ); // Prefill with 32 ounces

JarType jar6( 'a' ); // Should print invalid request.

Do cout's to make sure the jars have the requested

quantity.

g) Add a global function to ask the user for the number of units.

The prototype goes before main() as follows:

int getInput( int & n );

The code for the function goes after the closing "}" for main(), as follows:

// Description: A function to ask user for a value

// Return status: 0 a valid number is entered

// 1 a valid number is not entered

int getInput(int & n)

{

int temp;

std::cout

std::cin >> temp;

if ( temp > 0 )

{

n = temp;

return 0;

}

return 1;

} // end of getInput()

h) Now, in main() use getInput for a jar -- for example:

JarType jar6;

int number = 0;

// Get a number from the user to add to jar6.

int status = getInput( number );

// Be sure the number is "good".

if ( status == 0 )

{

jar6.add( number );

}

std::cout

jar1.numUnits = 10000;

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