#include<stdio.h>
#include<conio.h>
#include<math.h>
void main()
/*{	float p,t,r,ncmp_year;
	float simple,compound,cmp_amount;
	clrscr();
	printf("Principal:");

	scanf("%f",&p);
	printf("Rate:");
	scanf("%f",&r);
	printf("Time:");
	scanf("%f",&t);
	printf("compoundings per year:");
	scanf("%f",&ncmp_year);
	simple=p*t*r/100;
        cmp_amount=p*pow(1+r/(ncmp_year*100),ncmp_year*t);
	compound=cmp_amount-p;
	printf("The simple intrest is:%f\n",simple);
        printf("The compound intrest is:%f",compound);
	getch();
 }*/
/* {	float c,f;
	clrscr();
	printf("Enter temperature in celsius:" );
	scanf("%f",&c);
	f=1.8*c+32;
	printf("Equivalent fahrenheit=%f\n",f);
	printf("\nEnter temp. in fahrenheit:");
	scanf("%f",&f);
	c=(f-32)/1.8;
	printf("Equivalent celsius=%f",c);
	getch();
 }  */
 {	float a,b,c;
	float peri,s,area;
	clrscr();
	printf("Enter three sides:");
	scanf("%f %f %f",&a,&b,&c);
	peri=a+b+c;
	s=peri/2;
	area=sqrt(s*(s-a)*(s-b)*(s-c));
	printf("Area of the tringle is %f\n",area);
        getch();
 }