#include <stdio.h>
int main()
{
int Side_1, Side_2, Side_3;
printf("Please enter the length of the first side of the triangle: ");
scanf("%d%*c", &Side_1);
printf("Please enter the length of the second side of the triangle: ");
scanf("%d%*c", &Side_2);
printf("Please enter the length of the third side of the triangle: ");
scanf("%d%*c", &Side_3);
if ((Side_1 <= 0) ||(Side_2 <= 0) || (Side_3 <= 0))
printf("You can not have a negative value for any of the sides. Your triangle is invalid.");
else
if ((Side_1 == Side_2) && (Side_1 == Side_3) && (Side_2 == Side_3))
printf("You have entered valid dimensions for an equilateral triangle.");
else
if ((Side_1 == Side_2) && (Side_1 != Side_3) && (Side_2 != Side_3))
printf("You have entered valid dimensions for an isoceles triangle.");
else
if ((Side_2 == Side_3) && (Side_1 != Side_3) && (Side_2 != Side_1))
printf("You have entered valid dimensions for an isoceles triangle.");
else
if ((Side_1 == Side_3) && (Side_1 != Side_2) && (Side_2 != Side_3))
printf("You have entered valid dimensions for an isoceles triangle.");
else
if ((Side_1 != Side_2) && (Side_1 != Side_3) && (Side_2 != Side_3) && (Side_1 + Side_2 > Side_3) || (Side_1 + Side_3 > Side_2) OR (Side_2 + Side_3 > Side_1))
printf("You have entered valid dimensions for a scalene triangle.");
return(0);
}