风云7857
下面是我为你搜索到的答案,程序分析:判断素数的方法:用一个数分别去除2到sqrt(这个数),如果能被整除,则表明此数不是素数,反之是素数。public class Exp2 { public static void main(String args[]) { int i = 0; math mymath = new math(); for (i = 2; i <= 200; i++) if (mymath.iszhishu(i) == true) System.out.println(i); }}class math { public int f(int x) { if (x == 1 || x == 2) return 1; else return f(x - 1) + f(x - 2); } public boolean iszhishu(int x) { for (int i = 2; i <= x / 2; i++) if (x % 2 == 0) return false; return true; }}