Fungsi Dengan Nilai Balik Bahasa C

--#include
#include
int kuadrat(int a);
void main()
{
clrscr();
for (int bil=2; bil<20 bil="" p=""> {
printf("\t%d",bil);
printf("\t%d\n",kuadrat(bil));
}
for (int bil2=1; bil2<10 bil2="" p=""> {
printf("\t%d",bil2);
printf("\t%d\n",kuadrat(bil2));
}
getch();
}

int kuadrat(int a)
{
int z;
z=a*a;
return(z);
}