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Triangle Project (Using Functions and Arrays)

dvarona1 (6)
Hey everyone, for my final programming project, we must let the user enter 3 lengths in which we then must determine what kind of triangle it is. Functions and Arrays are the main focus of this project. I know I'm close to completing it but I'm running into a error in the voidangleType function. We only just recently finished the lecture and I can't wrap my head around what the problem is. Assistance would be greatly appreciated!

Including the main function, we needed functions that:
⦁ A function to swap two double values.
⦁ A function to sort the 3 sides.
⦁ A function to input the 3 sides.
⦁ A function to return or display equilateral, isosceles, or scalene.
⦁ A function to return or display right, acute, or obtuse.


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#include <iostream>
#include <string>
using namespace std;

// Function prototypes
void getLengths(double[], double);
void sortArray(double[], double);
void isTriangle(double[], double);
void equalSides(double[], double);
void angleType(double[], double);

// Main function calls all the other functions
int main()
{
	// Triangles always have 3 sides
	const int sides = 3;
	double triangleLengths[sides];

	// Function calls
	getLengths(triangleLengths, sides);

	sortArray(triangleLengths, sides);

	isTriangle(triangleLengths, sides);

	equalSides(triangleLengths, sides);

	angleType(triangleLengths, sides);

	system("pause");
	return 0;

}

// This function collects the three lengths from the user
void getLengths(double lengths[], double sides)
{
	// The counter for given lengths
	int index;
	// Ask user to input 3 lengths
	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];
			}

		}
	}
}

// This function sorts the array
void sortArray(double array[], double sides)
{
	bool swap;	// Swaps two double values
	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);
}

// This function confirms if the entered lengths form a triangle
void isTriangle(const double lengths[], double sides)
{
	for (int i = 0; i <= sides; i++)
	{
		if (lengths[i] + lengths[i + 1] > lengths[i + 2])
			cout << "These 3 sides form a triangle" << endl;
		else if (lengths[i] + lengths[i + 2] > lengths[i + 1])
			cout << "These 3 sides form a triangle" << endl;
		else if (lengths[i + 1] + lengths[i + 2] > lengths[i])
			cout << "These 3 sides form a triangle" << endl;
		else
			cout << "These 3 sides do not form a triangle" << endl;
	}
}

// This function tells the user the type of triangle
void equalSides(const double lengths[], double sides)
{
	for (int i = 0; i < 3; i++)
	{
		if (lengths[i] == lengths[i + 1] && lengths[i] == lengths[i + 2])
			cout << "This is an equalateral triangle" << endl;
		else if (lengths[i] == lengths[i + 1] || lengths[i] == lengths[i + 2])
			cout << "This triangle is isosceles" << endl;
		else
			cout << "This triangle is scalene" << endl;
	}
}

// This function tells if the triangle is right, acute, or obtuse
void angleType(double lengths[], double sides)
{

	for (int i = 0; i <= sides; i++)
	{

		if (lengths[i + 2] * lengths[i + 2] == lengths[i] * lengths[i] + lengths[i + 1] * lengths[i + 1])
			cout << "This is a right triangle" << endl;
		else if (lengths[i + 2] * lengths[i + 2] > lengths[i] * lengths[i] + lengths[i + 1] * lengths[i + 1])
			cout << "This triangle is obtuse" << endl;
		else if (lengths[i + 2] * lengths[i + 2] < lengths[i] * lengths[i] + lengths[i + 1] * lengths[i + 1])
			cout << "This triangle is acute" << endl;

	}
}
Last edited on
keanedawg (181)
Line 115.

I think you are using a '=' instead of an '=='
dvarona1 (6)
Hmm. Yeah that fixed the one issue there. Thank you.

But now some other error codes have shown up saying:

Error 1 error LNK2019: unresolved external symbol "void __cdecl isTriangle(double * const,double)" (?isTriangle@@YAXQANN@Z) referenced in function _main

Error 2 error LNK2019: unresolved external symbol "void __cdecl equalSides(double * const,double)" (?equalSides@@YAXQANN@Z) referenced in function _main

I've tried switching data types but nothing is working for those two functions correctly.
mpacker (12)
Those two functions are expecting a consts. So you can send them consts, or change them to not expect consts.
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