Converting numbers to words in C++ using SWITCH

[Waleed_4]

I have to create a program that asks a person to enter numbers (1-99) and convert it into words. I've been working on this for days and I still don't see what I'm doing wrong! PLEASE HELP ME!!!
I get an error on all the case numbers and I dont understand what is wrong.
EXAMPLE:
  using namespace std;
   
27
   
twenty-seven    

#include <string>

 //function prototypes go here

    int main()
{
    int input;

    cout << "Please enter a positive integer: ";
    cin >> input;

    cout << intName(input) << endl;

    cout << endl;
    system("pause");
    return EXIT_SUCCESS;
}

string intName(int number)
{
    int part = number;  //The part that still needs to be converted
    string name;        //The return value

    if (part >= 100)
    {
        name = digitName(part / 100) + " hundred";
        part = part % 100;
    }

    if (part >= 20)
    {
        name = name + " " + tensName(part);
        part = part % 10;
    }
    else if (part >= 10)
    {
        name = name + " " + teenName(part);
        part = 0;
    }

    if (part > 0)
    {
        name = name + " " + digitName(part);
    }

    return name;
}

/*
Turns a digit into its English name
@param  an integer btw 1 and 9
@return the name of digit( "one" ... "nine" )
*/
string digitName(int digit)
{
    case 0:
        cout << " ";
        break;
    case 1:
        cout << "one";
        break;
    case 2:
        cout << "two";
        break;
    case 3:
        cout << "three";
        break;
    case 4:
        cout << "four";
        break;
    case 5:
        cout << "five";
        break;
    case 6:
        cout << "six";
        break;
    case 7:
        cout << "seven";
        break;
    case 8:
        cout << "eight";
        break;
    case 9:
        cout << "nine";
        break;
    default:
        cout << " Error ";
}

/*
Turns a number btw 10 and 19 into its English name.
@param number an integer btw 10 and 19
@return the name of the given number( "ten" ... "nineteen")
*/
string teenName(int number)
{
    case 10:
        cout << "Ten";
        break;
    case 11:
        cout << "Eleven";
        break;
    case 12:
        cout << "Twelve";
        break;
    case 13:
        cout << "Thirteen";
        break;
    case 14:
        cout << "Fourteen";
        break;
    case 15:
        cout << "Fifteen";
        break;
    case 16:
        cout << "Sixteen";
        break;
    case 17:
        cout << "Seventeen";
        break;
    case 18:
        cout << "Eighteen";
        break;
    case 19:
        cout << "Nineteen";
        break;
    default:
        cout << " Error ";

}

/*
Gives the name of the tens part of a number btw 20 and 99
@param number an integer btw 20 and 99
@return the name of the tens part of the number( "twenty" ... "ninety")
*/
string tensName(int number)
{
    case 2: cout << “Twenty”;
        break;
    case 3: cout << “Thirty”;
        break;
    case 4: cout << “Fourty”;
        break;
    case 5: cout << “Fifty”;
        break;
    case 6: cout << “Sixty”;
        break;
    case 7: cout << “Seventy”;
        break;
    case 8: cout << “Eighty”;
        break;
    case 9: cout << “Ninety”;
        break;
}

[rproffitt]

While I don't see where you call the functions in main(), this has over 70 solutions at https://rosettacode.org/wiki/Number_names

For code like this, it's best to not recreate the wheel. If this is homework, just work on your main() section to call the functions.

[Reverend Jim]

A switch construct needs a switch statement. You don't have one. Look up the syntax.