I\'m trying to configure this C++ program, to when a user inputs another value o

Question

I'm trying to configure this C++ program, to when a user inputs another value other than a number for gross pay ie a letter or a simbol, it says Error: invalid gross pay amount. So far it only does that for negative numbers only. Here is the program:

#include <iostream>        //For cin and cout
#include <string>        //may include letters, digits, and various special characters
#include <iomanip>        //Define several manipulators that each take a single argument   


using namespace std;

int main()
{
/*

outputs
Federal Income Tax , State Tax , Social Security + Medicare Tax , Health Insurance

*/
string empName = "";
double grossPay = -1 , federalTax , stateTax , sSecMedcare , healthIns ;

cout << "Enter Employee's name "<<endl;
getline(cin,empName);

cout << "Enter Gross pay " <<endl;
cin >> grossPay ;

if(grossPay < 0)


{

cout << " ERROR: Invalid gross pay amount " <<endl;

cout<< "Press any key to exit." << endl;
        cin.ignore(2);

return 0;

}

cout << std::fixed << std::setprecision(2) ;
cout<< empName <<endl;
cout<< "Gross Amount: ............$" << grossPay << endl;

//input to o/p processing

federalTax = ( .15 * grossPay ) ;

stateTax = ( .035 * grossPay ) ;

sSecMedcare = ( .085 * grossPay );

healthIns = 75;


cout<< "Federal Tax: .............$" << federalTax << endl;
cout <<"State Tax:................$" << stateTax << endl;
cout<< "Social sec/Medicare:------$" << sSecMedcare << endl;
cout<< "Health Insurance:.........$" << healthIns << endl;
cout <<"Net pay:..................$" << ( grossPay - (federalTax + stateTax + sSecMedcare + healthIns)) <<endl;

system("PAUSE");
}

THANK YOU.

Explanation / Answer

You can check to see if an int has been filled with this code:

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