Program calculates details of a Triangle given the lengths of its sides

#include "stdio.h"
#include "conio.h"
#include "stdlib.h"
#include "math.h"

main()
{
clrscr();
float a,b,c,S,D,A,B,C,Area,R;
printf("Enter the lengths of the three sides of the triangle :");
scanf("%f%f%f",&a,&b,&c);

S = (a+b+c)/2.0; // S is the semiperimeter of the triangle
D = S*(S-a)*(S-b)*(S-c);//D is the square of the area of the triangle
if(D<=0)
{ printf("The triangle cannot be formed");
getch();
exit(0);
} if((a==b || b==c || c==a) && !(a==b && b==c && c==a)) // this complex logic is to eliminate interpretting a triangle with all three // sides equal as both isosceles and equilateral.
printf("The triangle is ISOSCELES");
if(a==b && b==c && c==a)
printf("The triangle is EQUILATERAL");
if(a!=b && b!=c && c!=a)
printf("The triangle is SCALENE");
Area = sqrt(D); R = (a*b*c)/(4.0*Area);
printf("PERIMETER = %.2f units ",(2.0*S));
printf("AREA = %.2f sq.units ",Area);
printf("CIRCUM RADIUS = %.2f units",R); // using sine rule,we get... A = (180.0/3.1415926)*asin(a/(2.0*R));// value of pi should be upto 7 B = (180.0/3.1415926)*asin(b/(2.0*R));// decimal places of accuracy and also C = (180.0/3.1415926)*asin(c/(2.0*R));// note that the 7th decimal place is // 6 and not 7 as it had to be if were if(A==90.0 || B==90.0 || C==90.0) // approximated to 7 decimal places
printf(" The triangle is RIGHT ANGLED ");
if(A<90.0>
printf("The triangle is ACUTE ANGLED");
if(A>90.0 || B>90.0 || C>90.0)
printf("The triangle is OBTUSE ANGLED");
printf("The angles are as follows :");
printf("A = %.2f degrees",A);
printf("B = %.2f degrees",B);
printf("C = %.2f degrees",C);
printf("Where A,B,C stand for angles opposite to sides
%.2f,%.2f,%.2f",a,b,c);
printf(" respectively");

getch();
return 0;
}

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