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#include <iostream>
#include <string>
#include <cmath>
#include "error.h"
using namespace std;
const double pi = 3.14159; // Global constant pi accurate to 5 decimal points
// Fucntion to get positive number.
// Function must be greather than zero to count as a positive number.
double get_postivie_numb(const string& prompt= "")
{
cout << prompt;
double x;
cin >> x;
while (x <= 0)
{
cout << "Sorry, You can only enter positive numbers.\n";
cin >> x;
}
return x;
}
// Funciton to convert input to lowercase.
// Precondition: String must not contain numbers. Only letters.
string convert_to_lowercase(const string& s)
{
string result = "";
for(int i = 0; i < s.size(); i++)
{
int x = 0;
x = static_cast<int>(s[i]);
char y = x;
if (x < 97)
{
x += 32;
y = x;
}
result +=y;
}
return result;
}
// Circle Functions:
void circle_information(double& radius)
{
radius = get_postivie_numb("What is the radius of the circle?");
}
double circle_area(double& radius)
{
double area = pi * radius * radius;
return area;
}
double circle_perimeter(double& radius)
{
double perimeter = 2 * pi * radius;
return perimeter;
}
// Square Functions:
void square_information(double& height)
{
height = get_postivie_numb("What is the height of the square? \n");
}
double square_area(double& height)
{
double area = height * height;
return area;
}
double square_perimeter(double& height)
{
double perimeter = height * 4;
return perimeter;
}
// Rectangle Functions:
void rectangle_information(double& height, double& width)
{
height = get_postivie_numb("Enter the height of the rectangle.\n");
width = get_postivie_numb("Enter the width of the rectangle.\n");
}
double rectangle_area(double& height, double& width)
{
double area = height * width;
return area;
}
double rectangle_perimeter(double& height, double& width)
{
double perimeter = (2 * height) + (2 * width);
return perimeter;
}
// Triangle Functions:
void triangle_information(double& a, double& b, double& c)
{
cout << "Please enter the side lengths from least to greatest.\n";
a = get_postivie_numb("Enter side length a. \n");
b = get_postivie_numb("Enter side length b. \n");
c = get_postivie_numb("Enter side length c. \n");
}
//Precondition: Triangle must be a real triangle. NO impossible triangles.
// Example : traingle with sides 3,4,54 is not a real triangle.
double triangle_area(double& a, double& b, double& c, double s) // Heron's Formula
{
double area = sqrt((s-a)*(s-b)*(s-c)*s);
return area;
}
double triangle_perimeter(double& a, double& b, double& c)
{
double perimeter = a + b + c;
return perimeter;
}
int main()
{
string s = "";
while (s != "done" || s!= "quit")
{
cout << "Enter the name of a geometric shape. (Type \"done\" or \"quit\" to exit):";
cin >> s;
if (convert_to_lowercase(s) == "circle" || convert_to_lowercase(s) == "cir")
{
double radius = 0.0;
circle_information(radius);
cout << "The area of the circle is " << circle_area(radius) << ".\n";
cout << "The perimeter of the circle is " << circle_perimeter(radius) <<".\n\n";
}
else if (convert_to_lowercase(s) == "square" || convert_to_lowercase(s) == "sq")
{
double height = 0;
square_information(height);
cout << "The area of the square is " << square_area(height) << ". \n";
cout << "The perimeter of the square is " << square_perimeter(height) << ". \n\n";
}
else if (convert_to_lowercase(s) == "rectangle" || convert_to_lowercase(s) == "rect")
{
double height = 0;
double width = 0;
rectangle_information(height, width);
cout << "The area of the rectangle is " << rectangle_area(height, width) << ".\n";
cout << "The perimeter of the rectangle is " << rectangle_perimeter(height, width) << ".\n\n";
}
else if (convert_to_lowercase(s) == "triangle" || convert_to_lowercase(s) == "tri")
{
double a = 0;
double b = 0;
double c = 0;
triangle_information(a, b, c);
double semi = triangle_perimeter(a,b,c)/2.0; //semiperimeter of triangle
while(a > b || a > c || b > c)
{
cout << "It seems you did not type the numbers from least to greatest."
<< "Please try again.\n";
triangle_information(a, b, c);
}
double x = a + b;
if (c > x)
{
cout << "This will produce an impossible trianlge.\n\n";
}
else
{
cout << "The area of the triangle is " << triangle_area(a, b, c, semi) << ".\n";
cout << "The perimeter of the rectangle is " << triangle_perimeter(a, b, c) << ".\n\n";
}
}
else
{
cout << "Sorry. Program doesn't know that shape. Please try again.\n\n";
}
}
}
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