Q: if the length of a triangle are input through the keyboard, write a program to find the area of triangle.

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#include <stdio.h>
#include <math.h>
int main()
{
    float area,a,b,c,s; // a,b,c are sides of triangle //
   
    printf("enter side of triangle :  ");
    scanf("%f%f%f",&a,&b,&c);
   
    if (a+b<=c ||b+c<=a ||c+a<=b ||a<0 ||b<0 ||c<0)    //to check whether the triangle is possible or not//
    printf("triangle is not possible");
       
    else  //if the triangle is possible//
    {
        s=(a+b+c)/2;    /* to find the semi perimeter of triangle denoted as s/2 */
        area=sqrt(s*(s-a)*(s-b)*(s-c));    /*formula used to find area of triangle*/
       
        printf("area of triangle is %f",area);
    }
   
    return 0;
}

-----------------------------------------
output :

enter side of triangle :  3
4
5
area of triangle is 6.000000
-----------------------------------------
output :
enter side of triangle :  66
7
44
triangle is not possible

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