rw_calcfun.cpp

//Programmer: Eric Barnes

//Date: 3/19/2014

//Class: Cs 53

//Filename: rw_calcfun.cpp

//Description: Function definitions for ralphs calculatior program

#include "rw_calc.h"

void greet()

{

cout << "Hello Ralph, welcome to your calculator program...again \n" << endl;

return;

}

void demand_x()

{

cout << "Choose a value for x before attempting calculations" << endl;

return;

}

int menu()

{

int selection;

cout << "\t\t MENU\n";

cout << "1. Enter a positive number x \n";

cout << "2. Factorial (of integer part of x)\n";

cout << "3. Nth Root of x\n";

cout << "4. Power of x, x^n\n";

cout << "5. Exp(x)\n";

cout << "6. Sinh(x) (hyperbolic sine)\n";

cout << "7. Quit\n";

cout << "Make your selection: ";

cin >> selection;

return selection;

}

float get_posnum(const string numname)

{

int in_num;

do

{

cout << "Enter the (positive) value of your " << numname <<" choice : ";

cin >> in_num;

if(in_num <= 0)

cout << "Not like that" << endl << endl;

}while(in_num <= 0);

return in_num;

}

int fact(const int x)

{

int result = 1;

for(int i = 1; i <= x; i++)

{

result *= i;

}

return result;

}

float pow(const float x, const int n)

{

int result = 1;

for(int i = 0; i < n; i++)

{

result *= x;

}

return result;

}

float nth_root(const float x, const int n)

{

float root = x;

for(int i = 0; i < ROOT_ITRS; i++)

{

root = ((n - 1)*root + x/pow(root, n-1))/n;

}

return root;

}

float exponential(const float x)

{

float exp = 1;

float num;

float den;

for(int i = 1; i <= EXP_TERMS; i++)

{

num = pow(x,i);

den = fact(i);

exp += num/den;

}

return exp;

}

float sinh(const float x)

{

return (exponential(x) - (1/exponential(x)))/2;

}

void goodbye()

{

cout << "Goodbye Ralph, better luck next time" << endl;

return;

}