static void Main(string[] args)
{
CommandsResolver commands = new CommandsResolver();
CalculatorCommands.Register(commands);
CalculatorCommands.RegisterConstants(commands);
Stack <double> stack = new Stack <double>();
AssemblyName asm = typeof(Program).Assembly.GetName();
bool cont = true;
Console.WriteLine($"{asm.Name} {asm.Version}, by Bytewave");
Console.WriteLine();
Console.WriteLine("h/help for help");
Console.WriteLine();
while (cont)
{
string input = Prompt();
if (Double.TryParse(input, out double inputNumber))
{
if (Double.IsNaN(inputNumber))
{
Console.Error.WriteLine("Invalid number.");
}
else
{
stack.Push(inputNumber);
}
}
else
{
Func <Stack <double>, Stack <double> > resolvedCommand = commands.ResolveCommand(input);
if (resolvedCommand == null)
{
Console.Error.WriteLine($"{input} is not a command, constant, or valid number.");
}
else
{
stack = resolvedCommand(stack);
if (stack == null)
{
cont = false;
}
}
}
}
}
/// <summary>
/// Reigsters the commands for RPNCalc.
/// </summary>
/// <param name="commands">The current CommandsResolver object.</param>
public static void Register(CommandsResolver commands)
{
commands.RegisterCommand("rot", "r", (stack) => {
if (stack.Count < 2)
{
Console.Error.WriteLine("Not enough elements to rotate stack.");
return(stack);
}
Stack <double> newStack = new Stack <double>();
newStack.Push(stack.Pop());
foreach (double num in stack.Reverse())
{
newStack.Push(num);
}
return(newStack);
});
commands.RegisterCommand("swp", "s", (stack) => {
if (stack.Count < 2)
{
Console.Error.WriteLine("Cannot swap items without 2 items to swap.");
return(stack);
}
double[] nums = GetOperands(stack);
stack.Push(nums[1]);
stack.Push(nums[0]);
return(stack);
});
commands.RegisterCommand("dup", "d", (stack) => {
if (stack.Count < 1)
{
Console.Error.WriteLine("Cannot duplicate items from an empty stack.");
return(stack);
}
stack.Push(stack.Peek());
return(stack);
});
commands.RegisterCommand("print", "p", (stack) => {
if (stack.Count == 0)
{
Console.WriteLine("Empty stack.");
return(stack);
}
int counter = stack.Count - 1;
foreach (double num in stack.Reverse())
{
Console.WriteLine($"{counter} : {num:0.##########}");
counter--;
}
return(stack);
});
commands.RegisterCommand("pop", "x", (stack) => {
if (stack.Count == 0)
{
Console.Error.WriteLine("Cannot pop from an empty stack.");
return(stack);
}
stack.Pop();
return(stack);
});
commands.RegisterCommand("clear", "c", (stack) => {
stack.Clear();
return(stack);
});
commands.RegisterCommand("add", "+", (stack) => {
double[] nums = GetOperands(stack);
if (nums == null)
{
return(stack);
}
stack.Push(nums[0] + nums[1]);
return(stack);
});
commands.RegisterCommand("mul", "*", (stack) => {
double[] nums = GetOperands(stack);
if (nums == null)
{
return(stack);
}
stack.Push(nums[0] * nums[1]);
return(stack);
});
commands.RegisterCommand("sub", "-", (stack) => {
double[] nums = GetOperands(stack);
if (nums == null)
{
return(stack);
}
stack.Push(nums[0] - nums[1]);
return(stack);
});
commands.RegisterCommand("div", "/", (stack) => {
double[] nums = GetOperands(stack);
if (nums == null)
{
return(stack);
}
stack.Push(nums[0] / nums[1]);
return(stack);
});
commands.RegisterCommand("pow", "^", (stack) => {
double[] nums = GetOperands(stack);
if (nums == null)
{
return(stack);
}
stack.Push(Math.Pow(nums[0], nums[1]));
return(stack);
});
commands.RegisterCommand("sin", (stack) => {
double[] nums = GetOperands(stack, 1);
if (nums == null)
{
return(stack);
}
stack.Push(Math.Sin(nums[0]));
return(stack);
});
commands.RegisterCommand("cos", (stack) => {
double[] nums = GetOperands(stack, 1);
if (nums == null)
{
return(stack);
}
stack.Push(Math.Cos(nums[0]));
return(stack);
});
commands.RegisterCommand("tan", (stack) => {
double[] nums = GetOperands(stack, 1);
if (nums == null)
{
return(stack);
}
stack.Push(Math.Tan(nums[0]));
return(stack);
});
commands.RegisterCommand("cls", "z", (stack) => {
try {
Console.Clear();
} catch {
Console.WriteLine("cls is not supported here");
}
return(stack);
});
commands.RegisterCommand("log10", "log", (stack) => {
double[] nums = GetOperands(stack, 1);
if (nums == null)
{
return(stack);
}
stack.Push(Math.Log10(nums[0]));
return(stack);
});
commands.RegisterCommand("loge", "ln", (stack) => {
double[] nums = GetOperands(stack, 1);
if (nums == null)
{
return(stack);
}
stack.Push(Math.Log(nums[0]));
return(stack);
});
commands.RegisterCommand("logbase", "lb", (stack) => {
double[] nums = GetOperands(stack, 2);
if (nums == null)
{
return(stack);
}
stack.Push(Math.Log(nums[1], nums[0]));
return(stack);
});
commands.RegisterCommand("help", "h", (stack) => {
Console.WriteLine("STACK OPERATIONS");
Console.WriteLine("[number] - push a number onto the stack");
Console.WriteLine("rot, r - rotate the stack (pop top off, move to bottom)");
Console.WriteLine("swp, s - swap the top two elements on the stack");
Console.WriteLine("dup, d - duplicate the top number on the stack");
Console.WriteLine("print, p - show the current stack contents");
Console.WriteLine("pop, x - pop the last element off the stack");
Console.WriteLine("clear, c - clear the stack");
Console.WriteLine();
Console.WriteLine("ARITHMETIC AND FUNCTIONS");
Console.WriteLine("mul, * - multiply the top two numbers on the stack; push result");
Console.WriteLine("add, + - add the top two numbers on the stack");
Console.WriteLine("div, / - divide the top two numbers (1 / 0)");
Console.WriteLine("sub, - - subtract the top two numbers (1 - 0)");
Console.WriteLine("pow, ^ - raise the second top number to the top number (1 ^ 0)");
Console.WriteLine("sin, cos, tan - trig functions");
Console.WriteLine("log10, log - take the log base 10 of the top number");
Console.WriteLine("loge, ln - take the natural log of the top number");
Console.WriteLine("logbase, lb - take the log base (1) of (0)");
Console.WriteLine();
Console.WriteLine("CALCULATOR COMMANDS");
Console.WriteLine("cls, z - clear the screen");
Console.WriteLine("help, h - show this help");
Console.WriteLine("exit - exit the calculator");
Console.WriteLine();
Console.WriteLine("CONSTANTS");
Console.WriteLine("pi, e");
return(stack);
});
commands.RegisterCommand("exit", (stack) => {
return(null);
});
}
/// <summary>
/// Registers the constants used in RPNCalc.
/// </summary>
/// <param name="commands">The current CommandsResolver object.</param>
public static void RegisterConstants(CommandsResolver commands)
{
commands.RegisterConstant("pi", Math.PI);
commands.RegisterConstant("e", Math.E);
}