1-100之间的有多少个9

public class TestDemo2{ public static int sunM(int n) { int sum=0; int count=0; int cu=0; for (int i = 1; i <100 ; i++) { if(i%109){ count++; } if(i/109){ cu++; }sum=count+cu; }return sum; }

public static void main(String[] args) { int n=100; int ret=sunM(n); System.out.println(ret); }

}