package day01; //输出1-100中质数,并且每十个换行 public class PrimeNum { public static void main(String[] args) { //并非一次判断用开关
int count = 0;
for(int i = 2 ; i <= 100;i++) {
boolean flag = true; //1、假设是质数
for(int j = 2; j <= (int)Math.sqrt(i); j++) { //Math.squart()取平方根
if(i % j == 0) {
flag = false; //2、改为不是质数
break;
}
} if(flag) { //3、得结论
count++;
System.out.print(i + ",");
if(count%10 == 0)
System.out.println();
}
//else {
// System.out.println(i + "不是质数");
//}
}
} }