Menentukan Bilangan Prima

#include (stdio.h)
int bilprima(int x);
main(){
int a,s;
printf("Masukan bilangan: ");scanf("%d",&a);
printf("Bilangan prima: ");
s = bilprima (a);
if (s == 0){
printf("TIDAK");
}else{
printf("YA");}
printf("\n");
}
int bilprima(int x)
{
int n,s,t=1;
if ( x < s =" 0;" n="2;t!="0;n++){" t =" x%n;" n="="x){" s =" 1;}" s =" 0;}">