Program to find greatest number among three numbers using function

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/*Program to find greatest number among 3  Using function */

#include<iostream.h>
#include<conio.h>
void main()
{
float a,b,c,g;
float great(float ,float ,float );
clrscr();
cout<<"Enter three number:";
cin>>a>>b>>c;

g=great(a,b,c);

cout<<"Greater number is:"<<g;
getch();
}

float great(float a,float b,float c)
{
if(a>b && b>c)
{
return(a);
}
else
if(b>a && a>c)
{return(b);
}
else
{return(c);
}
}