public static void Main()
const string co = "************ SIMPLE CALCULATOR ********************";
const string yn = "would you like further instruction ? type in yes or no ";
const string co1 = "INSTRUCTIONS:";
const string co2 = "A) FOR INCREMENTS: ";
const string co3 = " for a prefix increment for the first input please type '++X' in the operator.";
const string co4 = " for a postfix increment for the first input please type 'X++' in the operator.";
const string co5 = " for the prefix increment for the second input please type in '++Y' in the operator.";
const string co6 = "for postfix increment on the second input please type in 'Y++' in the operator.";
const string co7 = "B) FOR DECREMENTS: ";
const string co8= " for the prefix decrement for the first input please type '--X' in operators.";
const string co9 = "for the postfix decrement for the first input please type 'X--' in operators.";
const string co10= " for the prefix decrement for the second input please type '--Y' in operators.";
const string co11 = "for the postfix decrement for the second input please type 'Y--' in operators.";
Console.WriteLine("instruction will no longer be shown");
Console.WriteLine("enter first input: ");
Console.WriteLine("enter operator: ");
Console.WriteLine("enter second input: ");
Console.WriteLine("the sum is : " + z);
Console.WriteLine("the difference is : " + z);
Console.WriteLine("the quotient is : " + z);
Console.WriteLine("the product is : " + z);
Console.WriteLine("the prefix increment of X : " + z);
Console.WriteLine("the postfix increment of X : " + z);
Console.WriteLine("the postfix increment of Y : " + z);
Console.WriteLine("the prefix increment of Y : " + z);
Console.WriteLine("the postfix decrement of X: " + z);
Console.WriteLine("the prefix decrement of X: " + z);
Console.WriteLine("the postfix decrement of Y: " + z);
Console.WriteLine("the prefix decrement of Y : " + z);