For fuction x^2-5

#include< stdio.h >
#include< conio.h >

void fun(int);

void main()
{
int n;
clrscr();

printf("Enter no for calculation:");
scanf("%d",&n);

fun(n);

getch();
}

void fun(int n)
{
int r;
r=n*n-5;

printf("%d",r);
}