Program to find the biggest among three numbers

#include<iostream.h>
#include<conio.h>
void main()
{
int a,b,c,big;
clrscr();
cout<<"Enter three numbers  ";
cin>>a>>b>>c;
if(a>b)
    {
    if(a>c)
        big=a;
    else
        big=c;
    }
    else
    {
    if(b>c)
        big=b;
    else
        big=c;
    }
cout<<"Biggest number is  "<<big;
getch();
}