Program to find area of triangle

/*Program to find area of triangle*/

#include<conio.h>

#include<stdio.h>

#include<math.h>

void main()

{

     float a,b,c,s=0,area;

     clrscr();

     printf("enter sides of triangle:");

     scanf("%f%f%f",&a,&b,&c);

     s=(a+b+c)/2;

     area=sqrt(s*(s-a)*(s-b)*(s-c));

     printf("area=%f",area);

     getch();

}

/*Program to find simple intrest*/

#include<conio.h>

#include<stdio.h>

void main()

{

    float p,n,r,si;

    clrscr();

    printf("enter principal,rate and no of year:");

    scanf("%f%f%f",&p,&r,&n);

    si=(p*n*r)/100;

    printf("simple intreat=%f ",si);

    getch();

}