an example program to check type of triangle

Triangle.c

#include <stdio.h>
#include <stdlib.h>
#include <math.h>

// check sideToCheck
int checkSide(int firstSide, int secondSide, int sideToCheck)
{
	if (sideToCheck > firstSide + secondSide)
	{
		return 0;
	}
	if (sideToCheck < abs(firstSide - secondSide))
	{
		return 0;
	}
	return 1;
}

// check all three sides of a triangle
int checkSides(int x, int y, int z)
{
	return checkSide(x, y, z) && checkSide(x, z, y) && checkSide(y, z, x);
}

int isEquilateral(int x, int y, int z)
{
	return x == y && x == z;
}

int isIsosceles(int x, int y, int z)
{
	return x == y || x == z || y == z;
}

int isRightTriangle(int x, int y, int z)
{
	int powOfX = pow(x, 2);
	int powOfY = pow(y, 2);
	int powOfZ = pow(z, 2);

	int maxSide = powOfX;
	if (powOfY > maxSide)
	{
		maxSide = powOfY;
	}
	if (powOfZ > maxSide)
	{
		maxSide = powOfZ;
	}
	return maxSide * 2 == powOfX + powOfY + powOfZ;
}

int main()
{
	int x, y, z;
	printf("Enter x,y,z:\n");
	scanf("%d%d%d", &x, &y, &z);

	int isValidSide = checkSides(x, y, z);
	if (!isValidSide)
	{
		printf("Invalid Triangle!\n");
		return -1;
	}

	if (isIsosceles(x, y, z))
	{
		printf("Isosceles\n");
		if (isEquilateral(x, y, z))
		{
			printf("Equilateral\n");
		}
	}
	else if (isRightTriangle(x, y, z))
	{
		printf("RightTriangle\n");
	}

	printf("End\n");
	return 0;
}