[C] compilation

# include <st.h>
int rayon,aire;
int main( )
{
printf("entrez le rayon (19):");
scanf("%d",&rayon);
aire=(int) (3.14159*rayon*rayon);
printf("\n\naire=%d\n",aire);
return 0
}

#include <stdio.h>
#include <stdlib.h>
#define PI 3.14159


int main( )
{
    int rayon,aire;
   printf("Entrez le rayon (19):");
   scanf("%d",&rayon);
   aire=(int) (PI*rayon*rayon);
   printf("\n\naire=%d\n",aire);
   return 0;
}