Please help , urgent c++ question

[Raman009]

Stop spamming the forum please.
Peace.

[Stewbond]

It's not that your program isn't working... it is. The only thing that isn't working is the display of your menus.

In DisplayMenuSelections() you have the following lines:

if(num==0) {
	cout << "NOT YET SET" << endl << endl;
} else {
	cout << num << endl << endl;
}

and

if(num !=0) {
	cout << "2.) Test for sign." << endl;
	cout << "3.) Test for even/odd." << endl;
	cout << "4.) Test for primality." << endl;
}

The menus are treating 0 as an invalid case.

The solution:
Initialize num to some crazy number:
int num = 0xdeadbeef;

Then when you check to see if num has been set, use that number:

if(num==0xdeadbeef) {
	cout << "NOT YET SET" << endl << endl;
} else {
	cout << num << endl << endl;
}

and

if(num !=0xdeadbeef) {
	cout << "2.) Test for sign." << endl;
	cout << "3.) Test for even/odd." << endl;
	cout << "4.) Test for primality." << endl;
}

By the way, I really like how you hide invalid menu options. It's creative!