/***********************************
 *           TANDYWP.CPP           *
 ***********************************/


#include <iostream.h>
#include <math.h>


void
Cube(long double Number) {
  long double Cubes;
  Cubes = Number * Number * Number;
  cout << "The cube of " << Number << " is: " << Cubes << ". \n";
}

void
Square(long double Number){
  long double Squares;
  Squares = Number * Number;
  cout << Squares << " is the square of " << Number << ". \n";
}

void
SquareRoot(long double Number) {
  if (Number < 0) {
    throw "Can't square root negative number.\n";
  }
  cout << "The square root of " << Number << " is: " << sqrtl(Number) << ". \n";
}

void
Power(long double Number) {
  long double ToPower;
  long double huh;
  cout << "What power do you wish to raise your number to?";
  cin >> huh;
  ToPower = exp(huh * log(Number));
  cout << Number << " raised to the " << huh
       << "th power is: " << ToPower << ". \n";
}

void
CubeRoot(long double Number) {
  long double CubeRoots;
  CubeRoots = exp(1./3. * log(Number));
  cout << "The cube root of " << Number << " is: " << CubeRoots << ". \n";
}

void
MultiRoot(long double Number) {
  if (Number < 0) {
    throw "Can't perform requested function. \n";
  }
  long double MultiRoots, huh;
  cout << "Enter the root to which you wish to lower your number: ";
  cin >> huh;
  MultiRoots = exp(1./huh * log(Number));
  cout << "The " << huh << "th root root of " << Number << " is: " <<
    MultiRoots << ". \n";
}

//this function shows the designer, year of creation, and purpose of TandyWP
void
OpeningSequence() {
  cout << "TandyWP v2.1. \n";
  cout << "Created 1996 by Warren Myers. \n";
  cout << "Updated 2001 by WMM. \n\n";
  cout << "TandyWP is an interactive math program that gives you a choice of \n"
       << " up to six different things to be done to a number that you type in. \n\n";
}

//this is the main() of the program
long double main(void) {
  long double Number;
  OpeningSequence();	//call the openingsequence function
  int choice = 7;

  cout<<endl;
  while(choice){
    cout << "Please enter a number that is greater than 0: ";
    cin >> Number;
    if (Number <0) {
      cout << "Unknown results in operations. \n";
      cout << "Dangerous outcomes if you choose numbers 5 or 6 as " ;
      cout << "your operation. \n";
    }
    cout << "What operation do you wish to be accomplished? \n";
    cout << "Cube              1 \n";
    cout << "Square            2 \n";
    cout << "Raise to power    3 \n";
    cout << "Cube root         4 \n";
    cout << "Multiple root     5 \n";
    cout << "Square root       6 \n";
    cout << "Quit              0 \n";
    cin >> choice;

    switch (choice) {
    case 0:        // just quit now
      exit(0);
    case 1:
      Cube(Number);
      break;
    case 2:
      Square(Number);
      break;
    case 3:
      Power(Number);
      break;
    case 4:
      CubeRoot(Number);
      break;
    case 5:
      try {
	MultiRoot(Number);
      }
      catch (char *warning) {
	cout << warning;
      }
      break;
    case 6:
      try {
	SquareRoot(Number);
      }
      catch (char *warning) {
	cout << warning;
      }
      break;
    default:
      cout << "Illegal function attempt. \n";
    }
    
    cout << "Another number? y/n ";
    char chk;
    cin >> chk;
    if(chk == 'n'  ||  chk == 'N')
      break;
  }
}