Area of triangle program

Q. Write a function to find the area of a triangle whose length of three sides is given.

Ans.

/*Program to area of triangle using Heron's Formula*/
 #include<stdio.h>
 #include<conio.h>
 #include<math.h> 
 int main()
 {
  int x=10,y=8,z=7;
  float s=0.0;
  double area=0;
  s=(x+y+z)/2.0;
  area=(s*(s-x)*(s-y)*(s-z));
  printf("\nArea of triangle = %lf",area);
  getch();
  return 0;

 }

Output:

Area of triangle = 773.43750075