Dollar Amount Formatter Modify Program 12-17 by adding a function string dollarFormat(double amount) that takes a dollar amount in numeric form and returns a string formatted in currency notation,...

Dollar Amount Formatter

Modify Program 12-17 by adding a function

string dollarFormat(double amount)

that takes a dollar amount in numeric form and returns a string formatted in currency

notation, with a $ sign and commas inserted at the appropriate locations. Test your

function using suitable inputs.