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#include <iostream>
#include <string>
using namespace std;
//Function prototypes
void getLengths(double[], double);
void sortArray(double[], double);
bool isTriangle(double[], double);
void equalSides(double[], double);
void angleType(double[], double);
int main()
{
const int sides = 3;
double triangleLengths[sides];
//Get three lengths of triangle from user
getLengths(triangleLengths, sides);
//Sort Array in ascending order
sortArray(triangleLengths, sides);
//See if entered side lengths can form a triangle
isTriangle(triangleLengths, sides);
//Determine whether the triangle is equilateral, isosceles, or scalene
equalSides(triangleLengths, sides);
//Determine whether the triangle is right, acute, or obtuse
angleType(triangleLengths, sides);
return 0;
}
void getLengths(double lengths[], double sides)
{
//Loop counter
int index;
//Get 3 sides
for (index = 0; index < sides; index++)
{
cout << "Enter the length of side " << (index + 1) << ": ";
cin >> lengths[index];
{
while (lengths[index] <= 0)
{
cout << "Please enter a length greater than zero " << endl;
cin >> lengths[index];
}
}
}
}
void sortArray(double array[], double sides)
{
bool swap;
double temp;
do
{
swap = false;
for (int count = 0; count < (sides - 1); count++)
{
if (array[count] > array[count + 1])
{
temp = array[count];
array[count] = array[count + 1];
array[count + 1] = temp;
swap = true;
}
}
} while (swap);
}
bool isTriangle(double lengths[], double sides)
{
int i = 0;
if (lengths[i] + lengths[i + 1] > lengths[i + 2] ||
lengths[i] + lengths[i + 2] > lengths[i + 1] ||
lengths[i + 1] + lengths[i + 2] > lengths[i])
return true;
else
return false;
}
void equalSides(double lengths[], double sides)
{
int i = 0;
if (lengths[i] == lengths[i + 1] && lengths[i] == lengths[i + 2])
cout << "The triangle is equilateral" << endl;
else if (lengths[i] == lengths[i + 1] || lengths[i] == lengths[i + 2])
cout << "The triangle is isosceles" << endl;
else
cout << "The triangle is scalene" << endl;
}
void angleType(double lengths[], double sides)
{
int i = 0;
if (lengths[i + 2] * lengths[i + 2] == lengths[i] * lengths[i] + lengths[i + 1] * lengths[i + 1])
cout << "The triangle is also a right triangle" << endl;
else if (lengths[i + 2] * lengths[i + 2] > lengths[i] * lengths[i] + lengths[i + 1] * lengths[i + 1])
cout << "The triangle is also obtuse" << endl;
else if (lengths[i + 2] * lengths[i + 2] < lengths[i] * lengths[i] + lengths[i + 1] * lengths[i + 1])
cout << "The triangle is also acute" << endl;
}
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