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#include <cstdlib>
#include <iostream>
#include <cmath>
#define pi 4 * atan(1)
using namespace std;
int main()
{
float var;
float var2;
char function;
for (;;)
{
do
{
cout << "Choose an operation, or press x to quit. \n";
cout << "a - Addition \n";
cout << "b - Subtraction \n";
cout << "c - Multiplacation \n";
cout << "d - Division \n";
cout << "e - The value of e \n";
cout << "f - The square of a number \n";
cout << "g - Take the ln of a number \n";
cout << "h - x^y \n";
cout << "i - Square root \n";
cout << "j - Take a cube root \n";
cout << "k - Value of Pi \n";
cout << "l - Reciprical of a number \n";
cout << "Trig Functions are in Degrees and Radians.\n";
cout << "m - sin \n";
cout << "n - cos \n";
cout << "o - tan \n";
cout << "p - csc \n";
cout << "q - sec \n";
cout << "r - cot \n";
cout << "s - Calculate compound intrest \n";
cout << "t - Calculate the roots of a quadratic equation \n";
cout <<
"u - Calculate the answer to life the universe and everything. \n\n";
cin >> function;
}
while (function < 'a' || function > 'u' && function != 'x');
if (function == 'x')
break;
switch (function)
{
case 'a':
cout << "Enter a number\n";
cin >> var;
cout << "Enter number to be added\n";
cin >> var2;
cout << var << "+" << var2 << " is " << var + var2 << "\n\n";
break;
case 'b':
cout << "Enter a number\n";
cin >> var;
cout << "Enter the number to be subtracted\n";
cin >> var2;
cout << "The difference of " << var << "-" << var2 << " is " << var -
var2 << "\n\n";
break;
case 'c':
cout << "Enter a number to multiply\n";
cin >> var;
cout << "Enter the other number\n";
cin >> var2;
cout << "The result of " << var << "*" << var2 << " is " << var *var2
<< "\n\n";
break;
case 'd':
cout << "Enter a number\n";
cin >> var;
cout << "Enter the divisor \n";
cin >> var2;
cout << "The quotient of " << var << "/" << var2 << " is " << var /
var2 << "\n\n";
break;
case 'e':
cout << "The Value of e is 2.71828182845904523536\n\n";
break;
case 'f':
cout << "Enter a number to square\n";
cin >> var;
cout <<var << " squared is " << var * var << ".\n\n";
break;
case 'g':
cout << "Enter a number\n";
cin >> var;
cout << "The ln is " << log(var) << "\n\n";
break;
case 'h':
cout << "Enter a number x \n";
cin >> var;
cout << "Enter the exponent y \n";
cin >> var2;
cout << "The result of x^y is "<< pow(var, var2) << "\n\n";
break;
case 'i':
cout << "Enter a number\n";
cin >> var;
cout << "The square root of " <<var<< " is " <<sqrt(var) << "\n\n";
break;
case 'j':
double cube, cuberoot;
cout << "Enter a number \n";
cin >> cube;
cuberoot = pow(abs(cube), 1.0 / 3.0);
cout << "\nThe cube root of " << cube << " is " << cuberoot << "\n\n";
break;
case 'k':
cout << "The value of pi is 3.14159265358979323846264338327950288\n\n";
break;
case 'l':
cout << "Please enter a number\n";
cin >> var;
cout << "The reciprical of the number is " << (1 / var) << "\n\n";
break;
case 'm':
double select;
double trig, degRads, rad;
cout << "Enter 1 for degrees and 2 for radians. \n";
cin >> select;
if (select == 1)
{
cout << "Enter the angle in degrees.\n";
cin >> trig;
degRads = ((trig) *pi) / 180;
cout << "The sine is " << sin(degRads) << "\n\n" << endl;
}
else if (select == 2)
{
cout << "Enter the angle in radians.\n";
cin >> rad;
cout << "The sine is " << sin(rad) << "\n\n";
}
else if (select != 1 || select != 2)
{
cout << "That is not an option\n\n";
}
break;
case 'n':
cout << "Enter 1 for degrees and 2 for radians. \n";
cin >> select;
if (select == 1)
{
cout << "Enter the angle in degrees.\n";
cin >> trig;
degRads = ((trig) *pi) / 180;
cout << "The cosine is " << cos(degRads) << "\n\n";
}
else if (select == 2)
{
cout << "Enter the angle in radians.\n";
cin >> rad;
cout << "The cosine is " << cos(rad) << "\n\n";
}
else if (select != 1 || select != 2)
{
cout << "That is not an option\n\n";
}
break;
case 'o':
cout << "Enter 1 for degrees and 2 for radians. \n";
cin >> select;
if (select == 1)
{
cout << "Enter the angle in degrees.\n";
cin >> trig;
degRads = ((trig) *pi) / 180;
cout << "The tangent is " << tan(degRads) << "\n\n";
}
else if (select == 2)
{
cout << "Enter the angle in radians.\n";
cin >> rad;
cout << "The tangent is " << tan(rad) << "\n\n";
}
else if (select != 1 || select != 2)
{
cout << "That is not an option\n\n";
}
break;
//I took out these functions so I could post the code
case 's':
double percent, time, number, rate, totalComp, yield;
cout << "This will calculate compound intrest.\n";
cout << "Enter the principal in dollars and cents: ";
cin >> percent;
cout << "Enter the time in years: ";
cin >> time;
cout << "Enter the number of compoundings a year: ";
cin >> number;
cout << "Enter the intrest rate as a percent: ";
cin >> rate;
totalComp = number * time;
yield = percent * pow((1+(rate *0.01) / number), (totalComp)) - percent;
cout << "The total intrest yield is: " << yield << "\n\n";
break;
case 't':
double value, value2, value3, value4, value5, value6, value7, value8,
value9;
cout <<
"This will calculate roots of a quadratic equation of the form ax^2+bx+c \n";
cout << "Enter the leading coefficient 'a': ";
cin >> value;
cout << "Enter coefficient 'b': ";
cin >> value2;
cout << "Enter the constant 'c': ";
cin >> value3;
value6 = (2 *value);
value7 = (value2 *value2) - 4 * value * value3;
value8 = - 1 * value7;
value9 = - 1 * value2;
if (value7 < 0)
{
value5 = sqrt(value8);
cout << "The roots are " << (value9 + value5) / value6 << "i and " <<
(value9 - value5) / value6 << "i\n\n";
}
else
{
value4 = sqrt(value7);
double value11 = ( - value + value4) / value6;
cout << "The roots are " << (value9 + value4) / value6 << " and " <<
(value9 - value4) / value6 << "\n\n";
}
break;
case 'u':
cout << "The answer is 42. \n\n";
break;
default://This is the problem
cout << "That is not an option!";//this is the problem
}
}
return 0;
}
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