PracticeDayOneExercise4

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

int main()
{
    float a, b ,c, P, S;
    printf("a: ");
    scanf("%f", &a);
    printf("b: ");
    scanf("%f", &b);
    printf("c: ");
    scanf("%f", &c);

    if(a > 0 && b > 0 && c > 0 && a + b > c && a + c > b && b + c > a)
        {
        P = a + b + c;
        S = sqrt(P/2 * ((P/2) - a) * ((P/2) - b) * ((P/2) - c));
        printf("S: %.2f sm^2\n", S);
        printf("P: %.2f sm\n", P);
        if(a == b == c)
        {
            printf("Triangle is equilateral!\n");
        }
        else if(a == b || a == c || b == c){
            printf("Triangle is isosceles!\n");
        }
        else
        {
            printf("Triangle is scalene!\n");
        }

        if((a*a) + (b*b) == c*c || (b*b) + (c*c) == a*a || (a*a) + (c*c) == b*b)
        {
            printf("Triangle is rectangular!");
        }
        else if((a*a) + (b*b) > c*c || (b*b) + (c*c) > a*a || (a*a) + (c*c) > b*b)
        {
            printf("Triangle is acute!");
        }
        else if((a*a) + (b*b) < c*c || (b*b) + (c*c) < a*a || (a*a) + (c*c) < b*b){
            printf("Triangle is obtuse!");
        }
    }
    else
    {
        printf("Not a triangle!");
    }
}