// Evaluates the operator, calls the right math method, prints answer, and passes answer to it's recall method
public void Calculate(string Operator, string UserInput)
{
if (Operator == "+") // Addition
{
Answer = Calculator.Add(First, Second);
Console.WriteLine("Answer: " + Answer);
Stack.LastAnswer(UserInput, Answer);
}
else if (Operator == "-") // Subtraction
{
Answer = Calculator.Subtract(First, Second);
Console.WriteLine("Answer: " + Answer);
Stack.LastAnswer(UserInput, Answer);
}
else if (Operator == "*") // Multiplication
{
Answer = Calculator.Multiply(First, Second);
Console.WriteLine("Answer: " + Answer);
Stack.LastAnswer(UserInput, Answer);
}
else if (Operator == "/") // Division
{
if (Second == 0) // Throws error message if trying to divide by zero
{
Console.WriteLine("You can't divide by zero, Holmes.");
}
else
{
Answer = Calculator.Divide(First, Second);
Console.WriteLine("Answer: " + Answer);
Stack.LastAnswer(UserInput, Answer);
}
}
else if (Operator == "%") // Modulus Function
{
Answer = Calculator.Modulus(First, Second);
Console.WriteLine("Answer: " + Answer);
Stack.LastAnswer(UserInput, Answer);
}
}
static void Main(string[] args)
{
// Prompt Variables
String Prompt1 = "[";
String Prompt2 = "]> ";
int Counter = 0;
bool GoForth = true;
// Instantiate Classes
Expression Expression = new Expression();
Handler Handler = new Handler();
Stack Stack = new Stack();
Constants Constants = new Constants();
// Print an introduction to the program
Console.WriteLine("*** Welcome to Simple Calculator! ***\r\nPlease enter an equation using two numbers.\r\nThis calculator can add, subtract, multiply, divide, and use the modulus.\r\nYou can make any letter a variable using '=', but they can only be set once.\r\nType 'lastq' to see the last input you entered.\r\nType 'last' to repeat the last answer.\r\nType 'exit' or 'quit' when you are done.\r\n_______________________________________\r\n");
// Runs program in a loop
while (GoForth == true)
{
Console.Write(Prompt1 + Counter + Prompt2); // Prints prompt
String UserInput = Console.ReadLine().ToLower(); // Collects input in lower case
Handler.Exit(UserInput); // Handles exit commands, if present
Stack.LastQ(UserInput); // Prints last input, if user types 'lastq'
if (Stack.DoThis == true)
{
Stack.LastAnswer(UserInput, Expression.Answer); // Print last answer, if user types 'last'
}
if (Stack.DoThis == true)
{
Constants.SliceConstant(UserInput); // Checks to see if user is trying to set a constant
}
if ((Constants.KeepGoing == true) && (Stack.DoThis == true))
{
Expression.Slicer(UserInput); // Runs splicer code, which evaluates and parses an expression
if (Expression.DoMath == true)
{
Expression.Calculate(Expression.Operator, UserInput); // Runs calculate code, which determines and executes arithmatic
}
}
Counter++; // Increases prompt counter
Stack.LastInput = UserInput; // Save the user input into a new variable before repeating so it can be recalled
}
Console.Read();
}
