Area of Triangle ( Function Overloading )

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 //PROGRAM (c)c4cpp.co.nr 
#include<iostream.h> 
#include<conio.h> 
#include<process.h> 
#include<math.h> 
//function 1 
void area(float r) 
{float area_c; 
 area_c=(3.14*r*r); 
 cout<<"Area of the circle="<<area_c<<endl; 
} 
//function 2 
void area(int l,int h) 
{float area_r; 
 area_r=l*h; 
 cout<<"Area of the rectangle = "<<area_r<<endl; 
} 
//function 3 
void area(float a,float b,float c) 
{float s,area_t ; 
 s=(a+b+c)/2; 
 area_t=pow((s*(s-a)*(s-b)*(s-c)),0.5); 
 cout<<"Area of the triangle = "<<area_t<<endl; 
 } 
void main() 
{ 
clrscr(); 
int ch; 
float r,a,b,c,l,h; 
cout<<"1.Area of circle"<<endl<<"2.Area of rectangle"<<endl;cout<<"3.Area of triangle"<<endl<<"4.Exit"<<endl; 
X: 
cout<<"Enter the choice"<<endl; 
cin>>ch; 
switch(ch) 
{ 
case 1:cout<<"Enter the radius of the circle"<<endl; 
    cin>>r; 
    void area (float); 
    area(r); 
    goto X; 
case 2:cout<<"Enter the sides of rectangle"<<endl;                                         
    cin>>l>>h; 
    void area (float,float); 
    area (l,h); 
    goto X; 
case 3:cout<<"Enter the sides of triangle"<<endl; 
    cin>>a>>b>>c; 
    void area (float,float,float); 
    area (a,b,c); 
    goto X; 
case 4:exit(0); 
default:cout<<"Wrong Choice"<<endl; 
goto X;} 
getch();}