rw_calc.h
//Programmer: Eric Barnes
//Date: 3/19/2014
//Class: CS 53
//Filename: rw_calc.h
//Description: Function prototypes and documentation for ralphs caclulator
#ifndef RW_CALC_H
#define RW_CALC_H
#include <iostream>
using namespace std;
const int EXP_TERMS = 10;
const int SINH_TERMS = 5;
const int ROOT_ITRS = 8;
//Description: Greets the user
//pre: none
//post: greeting message is output to screen
void greet();
//Description: outputs menu and collects users choice
//pre: none
//post: menu and prompt are output to the screen
// users selection is returned
int menu();
//Description: outputs an error message telling user to choose x
//pre: none
//post: error message is output to screen
void demand_x();
//Description: collects positive numerical input from user
//Pre: none
//Post: prompt for numerical value is output to screen
// returns positive real number given by user
float get_posnum(const string numname);
//Description: Calculates the nth power
//Pre: n must be positive
//Post: returns the nth power of x
float pow(const float x, const int n);
//Description: Calculates the factorial of x
//Pre: x must be positive
//Post: returns the factorial of x
int fact(const int x);
//Description: Calculates the nth root of x
//Pre: x and n must be positive
//post: returns the nth root of x
float nth_root(const float x, const int n);
//Description: Calcuates e^x
//Pre: x must be positive
//Post: returns e^x
float exponential(const float x);
//Description: Calculates sinh(x)
//Pre: x must be positive
//Post: returns sinh(x)
float sinh(const float x);
//Description: tells user program is complete
//Pre: none
//Post: Goodbye message is output to screen
void goodbye();
#endif