用COUNT 累計到五就 換行 歸0
public class practice_1 {
public static void main(String[] args) {
int numA = 1;
int count=0;
int a, b, c,d;
for (a = 2; a <= 100; a++) {
for (b = 2; b < a; b++) {
if (a % b == 0)
break; }
if (b >= a) {
count++;
System.out.print(a);
if ( count ==5) {
System.out.println();
count = 0;
}
}
}
}
}