I have a program started but I\'m stuck on how to make it display a shipping cha

Question

I have a program started but I'm stuck on how to make it display a shipping charge. I have to create a program that displays the correct shipping charge based on the zip code entered by the user. Program needs to state whether zip is a valid 5-digit zip. But it also needs to display if the zip starts with "605" the shipping charge displays $25 or if the zip starts with "606" the shipping charge is $30. Also use a sentinel value to end program. Below is what I have come up with so far...

#include <iostream>
#include <string>
using namespace std;

int main()
{
   const string VALID_MSG = "Valid ZIP";
   const string INVALID_MSG = "Invalid ZIP";

   string zipCode = "";

   cout << "Five-character ZIP code (-1 to end): ";
   cin >> zipCode;

   while (zipCode != "-1")
   {
       if (zipCode.length() == 5)
           cout << VALID_MSG << endl;

       else
           cout << INVALID_MSG << endl << endl;
       //end if

       cout << "Five-character ZIP code (-1 to end): ";
       cin >> zipCode;
   } //end while

   //system("pause");
   return 0;
} //end of main function

Thanks

:-)

Explanation / Answer

#include <iostream>
#include <string>
using namespace std;

int main()
{
const string VALID_MSG = "Valid ZIP";
const string INVALID_MSG = "Invalid ZIP";

string zipCode = "";

cout << "Five-character ZIP code (-1 to end): ";
cin >> zipCode;

while (zipCode != "-1")
{
if (zipCode.length() == 5){
cout << VALID_MSG << endl;
if(zipCode[0]=='6' && zipCode[1]=='0' && zipCode[2]=='5')
cout<<"shipping charge 25$ ";
if(zipCode[0]=='6' && zipCode[1]=='0' && zipCode[2]=='6')
cout<<"shipping charge 30$ ";
}

else
cout << INVALID_MSG << endl << endl;
//end if

cout << "Five-character ZIP code (-1 to end): ";
cin >> zipCode;
} //end while

//system("pause");
return 0;
}

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