C Tutor... C Tutorial....

#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))
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);
A = (180.0/3.1415926)*asin(a/(2.0*R));
B = (180.0/3.1415926)*asin(b/(2.0*R));
C = (180.0/3.1415926)*asin(c/(2.0*R));
if(A==90.0 || B==90.0 || C==90.0)
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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