Write a function to evaluate and display the area of a triangle

   1:  include<stdio.h>

   2:  #include<conio.h>

   3:  #include<math.h>

   4:  #include<stdlib.h>

   5:   

   6:  void showarea(float a,float b,float c);

   7:  void main()

   8:  {

   9:  float a,b,c;

  10:  printf("\nEnter the sides of triangle: ");

  11:  scanf("%f%f%f",&a,&b,&c);

  12:  showarea(a,b,c);

  13:  getch();

  14:  }

  15:   

  16:  void showarea(float a,float b,float c)

  17:  {

  18:  float s,area;

  19:  s=(a+b+c)/2.0;

  20:  area=s*(s-a)*(s-b)*(s-c);

  21:  area=sqrt(area);

  22:  printf("\nArea of triangel is: %f\n",area);

  23:  }